# Commands covered:  expr
#
# This file contains a collection of tests for one or more of the Tcl
# built-in commands.  Sourcing this file into Tcl runs the tests and
# generates output for errors.  No output means no errors were found.
#
# $Header: /a/cvs/386BSD/ports/tcl/tests/expr.test,v 1.1.1.1 1993/08/09 10:57:43 alm Exp $ (Berkeley)

if {[string compare test [info procs test]] == 1} then {source defs}

# First, test all of the integer operators individually.

test expr-1.1 {integer operators} {expr -4} -4
test expr-1.2 {integer operators} {expr -(1+4)} -5
test expr-1.3 {integer operators} {expr ~3} -4
test expr-1.4 {integer operators} {expr !2} 0
test expr-1.5 {integer operators} {expr !0} 1
test expr-1.6 {integer operators} {expr 4*6} 24
test expr-1.7 {integer operators} {expr 36/12} 3
test expr-1.8 {integer operators} {expr 27/4} 6
test expr-1.9 {integer operators} {expr 27%4} 3
test expr-1.10 {integer operators} {expr 2+2} 4
test expr-1.11 {integer operators} {expr 2-6} -4
test expr-1.12 {integer operators} {expr 1<<3} 8
test expr-1.13 {integer operators} {expr 0xff>>2} 63
test expr-1.14 {integer operators} {expr -1>>2} -1
test expr-1.15 {integer operators} {expr 3>2} 1
test expr-1.16 {integer operators} {expr 2>2} 0
test expr-1.17 {integer operators} {expr 1>2} 0
test expr-1.18 {integer operators} {expr 3<2} 0
test expr-1.19 {integer operators} {expr 2<2} 0
test expr-1.20 {integer operators} {expr 1<2} 1
test expr-1.21 {integer operators} {expr 3>=2} 1
test expr-1.22 {integer operators} {expr 2>=2} 1
test expr-1.23 {integer operators} {expr 1>=2} 0
test expr-1.24 {integer operators} {expr 3<=2} 0
test expr-1.25 {integer operators} {expr 2<=2} 1
test expr-1.26 {integer operators} {expr 1<=2} 1
test expr-1.27 {integer operators} {expr 3==2} 0
test expr-1.28 {integer operators} {expr 2==2} 1
test expr-1.29 {integer operators} {expr 3!=2} 1
test expr-1.30 {integer operators} {expr 2!=2} 0
test expr-1.31 {integer operators} {expr 7&0x13} 3
test expr-1.32 {integer operators} {expr 7^0x13} 20
test expr-1.33 {integer operators} {expr 7|0x13} 23
test expr-1.34 {integer operators} {expr 0&&1} 0
test expr-1.35 {integer operators} {expr 0&&0} 0
test expr-1.36 {integer operators} {expr 1&&3} 1
test expr-1.37 {integer operators} {expr 0||1} 1
test expr-1.38 {integer operators} {expr 3||0} 1
test expr-1.39 {integer operators} {expr 0||0} 0
test expr-1.40 {integer operators} {expr 3>2?44:66} 44
test expr-1.41 {integer operators} {expr 2>3?44:66} 66

# Check the floating-point operators individually, along with
# automatic conversion to integers where needed.

test expr-2.1 {floating-point operators} {expr -4.2} -4.2
test expr-2.2 {floating-point operators} {expr -(1.1+4.2)} -5.3
test expr-2.3 {floating-point operators} {expr !2.1} 0
test expr-2.4 {floating-point operators} {expr !0.0} 1
test expr-2.5 {floating-point operators} {expr 4.2*6.3} 26.46
test expr-2.6 {floating-point operators} {expr 36.0/12.0} 3
test expr-2.7 {floating-point operators} {expr 27/4.0} 6.75
test expr-2.8 {floating-point operators} {expr 2.3+2.1} 4.4
test expr-2.9 {floating-point operators} {expr 2.3-6.5} -4.2
test expr-2.10 {floating-point operators} {expr 3.1>2.1} 1
test expr-2.11 {floating-point operators} {expr {2.1 > 2.1}} 0
test expr-2.12 {floating-point operators} {expr 1.23>2.34e+1} 0
test expr-2.13 {floating-point operators} {expr 3.45<2.34} 0
test expr-2.14 {floating-point operators} {expr 0.002e3<--200e-2} 0
test expr-2.15 {floating-point operators} {expr 1.1<2.1} 1
test expr-2.16 {floating-point operators} {expr 3.1>=2.2} 1
test expr-2.17 {floating-point operators} {expr 2.345>=2.345} 1
test expr-2.18 {floating-point operators} {expr 1.1>=2.2} 0
test expr-2.19 {floating-point operators} {expr 3.0<=2.0} 0
test expr-2.20 {floating-point operators} {expr 2.2<=2.2} 1
test expr-2.21 {floating-point operators} {expr 2.2<=2.2001} 1
test expr-2.22 {floating-point operators} {expr 3.2==2.2} 0
test expr-2.23 {floating-point operators} {expr 2.2==2.2} 1
test expr-2.24 {floating-point operators} {expr 3.2!=2.2} 1
test expr-2.25 {floating-point operators} {expr 2.2!=2.2} 0
test expr-2.26 {floating-point operators} {expr 0.0&&0.0} 0
test expr-2.27 {floating-point operators} {expr 0.0&&1.3} 0
test expr-2.28 {floating-point operators} {expr 1.3&&0.0} 0
test expr-2.29 {floating-point operators} {expr 1.3&&3.3} 1
test expr-2.30 {floating-point operators} {expr 0.0||0.0} 0
test expr-2.31 {floating-point operators} {expr 0.0||1.3} 1
test expr-2.32 {floating-point operators} {expr 1.3||0.0} 1
test expr-2.33 {floating-point operators} {expr 3.3||0.0} 1
test expr-2.34 {floating-point operators} {expr 3.3>2.3?44.3:66.3} 44.3
test expr-2.35 {floating-point operators} {expr 2.3>3.3?44.3:66.3} 66.3

# Operators that aren't legal on floating-point numbers

test expr-3.1 {illegal floating-point operations} {
    list [catch {expr ~4.0} msg] $msg
} {1 {can't use floating-point value as operand of "~"}}
test expr-3.2 {illegal floating-point operations} {
    list [catch {expr 27%4.0} msg] $msg
} {1 {can't use floating-point value as operand of "%"}}
test expr-3.3 {illegal floating-point operations} {
    list [catch {expr 27.0%4} msg] $msg
} {1 {can't use floating-point value as operand of "%"}}
test expr-3.4 {illegal floating-point operations} {
    list [catch {expr 1.0<<3} msg] $msg
} {1 {can't use floating-point value as operand of "<<"}}
test expr-3.5 {illegal floating-point operations} {
    list [catch {expr 3<<1.0} msg] $msg
} {1 {can't use floating-point value as operand of "<<"}}
test expr-3.6 {illegal floating-point operations} {
    list [catch {expr 24.0>>3} msg] $msg
} {1 {can't use floating-point value as operand of ">>"}}
test expr-3.7 {illegal floating-point operations} {
    list [catch {expr 24>>3.0} msg] $msg
} {1 {can't use floating-point value as operand of ">>"}}
test expr-3.8 {illegal floating-point operations} {
    list [catch {expr 24&3.0} msg] $msg
} {1 {can't use floating-point value as operand of "&"}}
test expr-3.9 {illegal floating-point operations} {
    list [catch {expr 24.0|3} msg] $msg
} {1 {can't use floating-point value as operand of "|"}}
test expr-3.10 {illegal floating-point operations} {
    list [catch {expr 24.0^3} msg] $msg
} {1 {can't use floating-point value as operand of "^"}}

# Check the string operators individually.

test expr-4.1 {string operators} {expr {"abc" > "def"}} 0
test expr-4.2 {string operators} {expr {"def" > "def"}} 0
test expr-4.3 {string operators} {expr {"g" > "def"}} 1
test expr-4.4 {string operators} {expr {"abc" < "abd"}} 1
test expr-4.5 {string operators} {expr {"abd" < "abd"}} 0
test expr-4.6 {string operators} {expr {"abe" < "abd"}} 0
test expr-4.7 {string operators} {expr {"abc" >= "def"}} 0
test expr-4.8 {string operators} {expr {"def" >= "def"}} 1
test expr-4.9 {string operators} {expr {"g" >= "def"}} 1
test expr-4.10 {string operators} {expr {"abc" <= "abd"}} 1
test expr-4.11 {string operators} {expr {"abd" <= "abd"}} 1
test expr-4.12 {string operators} {expr {"abe" <= "abd"}} 0
test expr-4.13 {string operators} {expr {"abc" == "abd"}} 0
test expr-4.14 {string operators} {expr {"abd" == "abd"}} 1
test expr-4.15 {string operators} {expr {"abc" != "abd"}} 1
test expr-4.16 {string operators} {expr {"abd" != "abd"}} 0
test expr-4.17 {string operators} {expr {"0y" < "0x12"}} 1
test expr-4.18 {string operators} {expr {1?"foo":"bar"}} foo
test expr-4.19 {string operators} {expr {0?"foo":"bar"}} bar

# Operators that aren't legal on string operands.

test expr-5.1 {illegal string operations} {
    list [catch {expr {-"a"}} msg] $msg
} {1 {can't use non-numeric string as operand of "-"}}
test expr-5.2 {illegal string operations} {
    list [catch {expr {~"a"}} msg] $msg
} {1 {can't use non-numeric string as operand of "~"}}
test expr-5.3 {illegal string operations} {
    list [catch {expr {!"a"}} msg] $msg
} {1 {can't use non-numeric string as operand of "!"}}
test expr-5.4 {illegal string operations} {
    list [catch {expr {"a"*"b"}} msg] $msg
} {1 {can't use non-numeric string as operand of "*"}}
test expr-5.5 {illegal string operations} {
    list [catch {expr {"a"/"b"}} msg] $msg
} {1 {can't use non-numeric string as operand of "/"}}
test expr-5.6 {illegal string operations} {
    list [catch {expr {"a"%"b"}} msg] $msg
} {1 {can't use non-numeric string as operand of "%"}}
test expr-5.7 {illegal string operations} {
    list [catch {expr {"a"+"b"}} msg] $msg
} {1 {can't use non-numeric string as operand of "+"}}
test expr-5.8 {illegal string operations} {
    list [catch {expr {"a"-"b"}} msg] $msg
} {1 {can't use non-numeric string as operand of "-"}}
test expr-5.9 {illegal string operations} {
    list [catch {expr {"a"<<"b"}} msg] $msg
} {1 {can't use non-numeric string as operand of "<<"}}
test expr-5.10 {illegal string operations} {
    list [catch {expr {"a">>"b"}} msg] $msg
} {1 {can't use non-numeric string as operand of ">>"}}
test expr-5.11 {illegal string operations} {
    list [catch {expr {"a"&"b"}} msg] $msg
} {1 {can't use non-numeric string as operand of "&"}}
test expr-5.12 {illegal string operations} {
    list [catch {expr {"a"^"b"}} msg] $msg
} {1 {can't use non-numeric string as operand of "^"}}
test expr-5.13 {illegal string operations} {
    list [catch {expr {"a"|"b"}} msg] $msg
} {1 {can't use non-numeric string as operand of "|"}}
test expr-5.14 {illegal string operations} {
    list [catch {expr {"a"&&"b"}} msg] $msg
} {1 {can't use non-numeric string as operand of "&&"}}
test expr-5.15 {illegal string operations} {
    list [catch {expr {"a"||"b"}} msg] $msg
} {1 {can't use non-numeric string as operand of "||"}}
test expr-5.16 {illegal string operations} {
    list [catch {expr {"a"?4:2}} msg] $msg
} {1 {can't use non-numeric string as operand of "?"}}

# Check precedence pairwise.

test expr-6.1 {precedence checks} {expr -~3} 4
test expr-6.2 {precedence checks} {expr -!3} 0
test expr-6.3 {precedence checks} {expr -~0} 1

test expr-7.1 {precedence checks} {expr 2*4/6} 1
test expr-7.2 {precedence checks} {expr 24/6*3} 12
test expr-7.3 {precedence checks} {expr 24/6/2} 2

test expr-8.1 {precedence checks} {expr -2+4} 2
test expr-8.2 {precedence checks} {expr -2-4} -6

test expr-9.1 {precedence checks} {expr 2*3+4} 10
test expr-9.2 {precedence checks} {expr 8/2+4} 8
test expr-9.3 {precedence checks} {expr 8%3+4} 6
test expr-9.4 {precedence checks} {expr 2*3-1} 5
test expr-9.5 {precedence checks} {expr 8/2-1} 3
test expr-9.6 {precedence checks} {expr 8%3-1} 1

test expr-10.1 {precedence checks} {expr 6-3-2} 1

test expr-11.1 {precedence checks} {expr 7+1>>2} 2
test expr-11.2 {precedence checks} {expr 7+1<<2} 32
test expr-11.3 {precedence checks} {expr 7>>3-2} 3
test expr-11.4 {precedence checks} {expr 7<<3-2} 14

test expr-12.1 {precedence checks} {expr 6>>1>4} 0
test expr-12.2 {precedence checks} {expr 6>>1<2} 0
test expr-12.3 {precedence checks} {expr 6>>1>=3} 1
test expr-12.4 {precedence checks} {expr 6>>1<=2} 0
test expr-12.5 {precedence checks} {expr 6<<1>5} 1
test expr-12.6 {precedence checks} {expr 6<<1<5} 0
test expr-12.7 {precedence checks} {expr 5<=6<<1} 1
test expr-12.8 {precedence checks} {expr 5>=6<<1} 0

test expr-13.1 {precedence checks} {expr 2<3<4} 1
test expr-13.2 {precedence checks} {expr 0<4>2} 0
test expr-13.3 {precedence checks} {expr 4>2<1} 0
test expr-13.4 {precedence checks} {expr 4>3>2} 0
test expr-13.5 {precedence checks} {expr 4>3>=2} 0
test expr-13.6 {precedence checks} {expr 4>=3>2} 0
test expr-13.7 {precedence checks} {expr 4>=3>=2} 0
test expr-13.8 {precedence checks} {expr 0<=4>=2} 0
test expr-13.9 {precedence checks} {expr 4>=2<=0} 0
test expr-10.10 {precedence checks} {expr 2<=3<=4} 1

test expr-14.1 {precedence checks} {expr 1==4>3} 1
test expr-14.2 {precedence checks} {expr 0!=4>3} 1
test expr-14.3 {precedence checks} {expr 1==3<4} 1
test expr-14.4 {precedence checks} {expr 0!=3<4} 1
test expr-14.5 {precedence checks} {expr 1==4>=3} 1
test expr-14.6 {precedence checks} {expr 0!=4>=3} 1
test expr-14.7 {precedence checks} {expr 1==3<=4} 1
test expr-14.8 {precedence checks} {expr 0!=3<=4} 1

test expr-15.1 {precedence checks} {expr 1==3==3} 0
test expr-15.2 {precedence checks} {expr 3==3!=2} 1
test expr-15.3 {precedence checks} {expr 2!=3==3} 0
test expr-15.4 {precedence checks} {expr 2!=1!=1} 0

test expr-16.1 {precedence checks} {expr 2&3==2} 0
test expr-16.2 {precedence checks} {expr 1&3!=3} 0

test expr-17.1 {precedence checks} {expr 7&3^0x10} 19
test expr-17.2 {precedence checks} {expr 7^0x10&3} 7

test expr-18.1 {precedence checks} {expr 7^0x10|3} 23
test expr-18.2 {precedence checks} {expr 7|0x10^3} 23

test expr-19.1 {precedence checks} {expr 7|3&&1} 1
test expr-19.2 {precedence checks} {expr 1&&3|7} 1
test expr-19.3 {precedence checks} {expr 0&&1||1} 1
test expr-19.4 {precedence checks} {expr 1||1&&0} 1

test expr-20.1 {precedence checks} {expr 1||0?3:4} 3
test expr-20.2 {precedence checks} {expr 1?0:4||1} 0

# Parentheses.

test expr-21.1 {parenthesization} {expr (2+4)*6} 36
test expr-21.2 {parenthesization} {expr (1?0:4)||1} 1

# Embedded commands and variable names.

set a 16
test expr-22.1 {embedded variables} {expr {2*$a}} 32
test expr-22.2 {embedded variables} {
    set x -5
    set y 10
    expr {$x + $y}
} {5}
test expr-22.3 {embedded commands and variables} {expr {[set a] - 14}} 2
test expr-22.4 {embedded commands and variables} {
    list [catch {expr {12 - [bad_command_name]}} msg] $msg
} {1 {invalid command name: "bad_command_name"}}

# Double-quotes and things inside them.

test expr-23.1 {double-quotes} {expr {"abc"}} abc
test expr-23.2 {double-quotes} {
    set a 189
    expr {"$a.bc"}
} 189.bc
test expr-23.3 {double-quotes} {
    set b2 xyx
    expr {"$b2$b2$b2.[set b2].[set b2]"}
} xyxxyxxyx.xyx.xyx
test expr-23.4 {double-quotes} {expr {"11\}\}22"}} 11}}22
test expr-23.5 {double-quotes} {expr {"\abc"}} {\abc}
test expr-23.6 {double-quotes} {
    catch {unset bogus__}
    list [catch {expr {"$bogus__"}} msg] $msg
} {1 {can't read "bogus__": no such variable}}
test expr-23.7 {double-quotes} {
    list [catch {expr {"a[error Testing]bc"}} msg] $msg
} {1 Testing}

# Numbers in various bases.

test expr-24.1 {numbers in different bases} {expr 0x20} 32
test expr-24.2 {numbers in different bases} {expr 015} 13

# Conversions between various data types.

test expr-25.1 {type conversions} {expr 2+2.5} 4.5
test expr-25.2 {type conversions} {expr 2.5+2} 4.5
test expr-25.3 {type conversions} {expr 2-2.5} -0.5
test expr-25.4 {type conversions} {expr 2/2.5} 0.8
test expr-25.5 {type conversions} {expr 2>2.5} 0
test expr-25.6 {type conversions} {expr 2.5>2} 1
test expr-25.7 {type conversions} {expr 2<2.5} 1
test expr-25.8 {type conversions} {expr 2>=2.5} 0
test expr-25.9 {type conversions} {expr 2<=2.5} 1
test expr-25.10 {type conversions} {expr 2==2.5} 0
test expr-25.11 {type conversions} {expr 2!=2.5} 1
test expr-25.12 {type conversions} {expr 2>"ab"} 0
test expr-25.13 {type conversions} {expr {2>" "}} 1
test expr-25.14 {type conversions} {expr {"24.1a" > 24.1}} 1
test expr-25.15 {type conversions} {expr {24.1 > "24.1a"}} 0
test expr-25.16 {type conversions} {expr 2+2.5} 4.5
test expr-25.17 {type conversions} {expr 2+2.5} 4.5

# Various error conditions.

test expr-26.1 {error conditions} {
    list [catch {expr 2+"a"} msg] $msg
} {1 {can't use non-numeric string as operand of "+"}}
test expr-26.2 {error conditions} {
    list [catch {expr 2+4*} msg] $msg
} {1 {syntax error in expression "2+4*"}}
test expr-26.3 {error conditions} {
    list [catch {expr 2+4*(} msg] $msg
} {1 {syntax error in expression "2+4*("}}
catch {unset _non_existent_}
test expr-26.4 {error conditions} {
    list [catch {expr 2+$_non_existent_} msg] $msg
} {1 {can't read "_non_existent_": no such variable}}
set a xx
test expr-26.5 {error conditions} {
    list [catch {expr {2+$a}} msg] $msg
} {1 {can't use non-numeric string as operand of "+"}}
test expr-26.6 {error conditions} {
    list [catch {expr {2+[set a]}} msg] $msg
} {1 {can't use non-numeric string as operand of "+"}}
test expr-26.7 {error conditions} {
    list [catch {expr {2+(4}} msg] $msg
} {1 {unmatched parentheses in expression "2+(4"}}
test expr-26.8 {error conditions} {
    list [catch {expr 2/0} msg] $msg
} {1 {divide by zero}}
test expr-26.9 {error conditions} {
    list [catch {expr 2%0} msg] $msg
} {1 {divide by zero}}
test expr-26.10 {error conditions} {
    list [catch {expr 2#} msg] $msg
} {1 {syntax error in expression "2#"}}
test expr-26.11 {error conditions} {
    list [catch {expr a.b} msg] $msg
} {1 {syntax error in expression "a.b"}}
test expr-26.12 {error conditions} {
    list [catch {expr {"a"/"b"}} msg] $msg
} {1 {can't use non-numeric string as operand of "/"}}
test expr-26.13 {error conditions} {
    list [catch {expr 2:3} msg] $msg
} {1 {can't have : operator without ? first}}
test expr-26.14 {error conditions} {
    list [catch {expr a@b} msg] $msg
} {1 {syntax error in expression "a@b"}}
test expr-26.15 {error conditions} {
    list [catch {expr a@b} msg] $msg
} {1 {syntax error in expression "a@b"}}
test expr-26.16 {error conditions} {
    list [catch {expr a[b} msg] $msg
} {1 {missing close-bracket}}
test expr-26.17 {error conditions} {
    list [catch {expr a`b} msg] $msg
} {1 {syntax error in expression "a`b"}}
test expr-26.18 {error conditions} {
    list [catch {expr \"a\"\{b} msg] $msg
} {1 {missing close-brace}}
test expr-26.19 {error conditions} {
    list [catch {expr a} msg] $msg
} {1 {syntax error in expression "a"}}

# Cancelled evaluation.

test expr-27.1 {cancelled evaluation} {
    set a 1
    expr {0&&[set a 2]}
    set a
} 1
test expr-27.2 {cancelled evaluation} {
    set a 1
    expr {1||[set a 2]}
    set a
} 1
test expr-27.3 {cancelled evaluation} {
    set a 1
    expr {0?[set a 2]:1}
    set a
} 1
test expr-27.4 {cancelled evaluation} {
    set a 1
    expr {1?2:[set a 2]}
    set a
} 1
catch {unset x}
test expr-27.5 {cancelled evaluation} {
    list [catch {expr {[info exists x] && $x}} msg] $msg
} {0 0}
test expr-27.6 {cancelled evaluation} {
    list [catch {expr {0 && [concat $x]}} msg] $msg
} {0 0}

# Tcl_ExprBool as used in "if" statements

test expr-28.1 {Tcl_ExprBoolean usage} {
    set a 1
    if {2} {
	set a 2
    }
    set a
} 2
test expr-28.2 {Tcl_ExprBoolean usage} {
    set a 1
    if {0} {
	set a 2
    }
    set a
} 1
test expr-28.3 {Tcl_ExprBoolean usage} {
    set a 1
    if {1.2} {
	set a 2
    }
    set a
} 2
test expr-28.4 {Tcl_ExprBoolean usage} {
    set a 1
    if {-1.1} {
	set a 2
    }
    set a
} 2
test expr-28.5 {Tcl_ExprBoolean usage} {
    set a 1
    if {0.0} {
	set a 2
    }
    set a
} 1
test expr-28.6 {Tcl_ExprBool usage} {
    list [catch {if {"abc"} {}} msg] $msg
} {1 {expression didn't have numeric value}}

# Operands enclosed in braces

test expr-29.1 {braces} {expr {{abc}}} abc
test expr-29.2 {braces} {expr {{00010}}} 8
test expr-29.3 {braces} {expr {{3.1200000}}} 3.12
test expr-29.4 {braces} {expr {{a{b}{1 {2 3}}c}}} "a{b}{1 {2 3}}c"
test expr-29.5 {braces} {
    list [catch {expr "\{abc"} msg] $msg
} {1 {missing close-brace}}

# Very long values

test expr-30.1 {long values} {
    set a "0000 1111 2222 3333 4444"
    set a "$a | $a | $a | $a | $a"
    set a "$a || $a || $a || $a || $a"
    expr {$a}
} {0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 || 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 || 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 || 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 || 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444 | 0000 1111 2222 3333 4444}
test expr-30.2 {long values} {
    set a "000000000000000000000000000000"
    set a "$a$a$a$a$a$a$a$a$a$a$a$a$a$a$a$a${a}5"
    expr $a
} 5