| expr(n) | Tcl Built-In Commands | expr(n) |
expr - Evaluate an expression
expr arg ?arg arg ...?
Concatenates args (adding separator spaces between them), evaluates the result as a Tcl expression, and returns the value. The operators permitted in Tcl expressions include a subset of the operators permitted in C expressions. For those operators common to both Tcl and C, Tcl applies the same meaning and precedence as the corresponding C operators. Expressions almost always yield numeric results (integer or floating-point values). For example, the expression
expr 8.2 + 6
A Tcl expression consists of a combination of operands, operators, and parentheses. White space may be used between the operands and operators and parentheses; it is ignored by the expression's instructions. Where possible, operands are interpreted as integer values. Integer values may be specified in decimal (the normal case), in binary (if the first two characters of the operand are 0b), in octal (if the first two characters of the operand are 0o), or in hexadecimal (if the first two characters of the operand are 0x). For compatibility with older Tcl releases, an octal integer value is also indicated simply when the first character of the operand is 0, whether or not the second character is also o. If an operand does not have one of the integer formats given above, then it is treated as a floating-point number if that is possible. Floating-point numbers may be specified in any of several common formats making use of the decimal digits, the decimal point ., the characters e or E indicating scientific notation, and the sign characters + or -. For example, all of the following are valid floating-point numbers: 2.1, 3., 6e4, 7.91e+16. Also recognized as floating point values are the strings Inf and NaN making use of any case for each character. If no numeric interpretation is possible (note that all literal operands that are not numeric or boolean must be quoted with either braces or with double quotes), then an operand is left as a string (and only a limited set of operators may be applied to it).
Operands may be specified in any of the following ways:
Where the above substitutions occur (e.g. inside quoted strings), they are performed by the expression's instructions. However, the command parser may already have performed one round of substitution before the expression processor was called. As discussed below, it is usually best to enclose expressions in braces to prevent the command parser from performing substitutions on the contents.
For some examples of simple expressions, suppose the variable a has the value 3 and the variable b has the value 6. Then the command on the left side of each of the lines below will produce the value on the right side of the line:
expr 3.1 + $a 6.1
expr 2 + "$a.$b" 5.6
expr 4*[llength "6 2"] 8
expr {{word one} < "word $a"} 0
The valid operators (most of which are also available as commands in the tcl::mathop namespace; see the mathop(n) manual page for details) are listed below, grouped in decreasing order of precedence:
See the C manual for more details on the results produced by each operator. The exponentiation operator promotes types like the multiply and divide operators, and produces a result that is the same as the output of the pow function (after any type conversions.) All of the binary operators group left-to-right within the same precedence level. For example, the command
expr {4*2 < 7}
The &&, ||, and ?: operators have “lazy evaluation”, just as in C, which means that operands are not evaluated if they are not needed to determine the outcome. For example, in the command
expr {$v ? [a] : [b]}
When the expression parser encounters a mathematical function such as sin($x), it replaces it with a call to an ordinary Tcl function in the tcl::mathfunc namespace. The processing of an expression such as:
expr {sin($x+$y)}
expr {[tcl::mathfunc::sin [expr {$x+$y}]]}
tcl::mathfunc::sin [expr {$x+$y}]
The executor will search for tcl::mathfunc::sin using the usual rules for resolving functions in namespaces. Either ::tcl::mathfunc::sin or [namespace current]::tcl::mathfunc::sin will satisfy the request, and others may as well (depending on the current namespace path setting).
See the mathfunc(n) manual page for the math functions that are available by default.
All internal computations involving integers are done calling on the LibTomMath multiple precision integer library as required so that all integer calculations are performed exactly. Note that in Tcl releases prior to 8.5, integer calculations were performed with one of the C types long int or Tcl_WideInt, causing implicit range truncation in those calculations where values overflowed the range of those types. Any code that relied on these implicit truncations will need to explicitly add int() or wide() function calls to expressions at the points where such truncation is required to take place.
All internal computations involving floating-point are done with the C type double. When converting a string to floating-point, exponent overflow is detected and results in the double value of Inf or -Inf as appropriate. Floating-point overflow and underflow are detected to the degree supported by the hardware, which is generally pretty reliable.
Conversion among internal representations for integer, floating-point, and string operands is done automatically as needed. For arithmetic computations, integers are used until some floating-point number is introduced, after which floating-point is used. For example,
expr {5 / 4}
expr {5 / 4.0}
expr {5 / ( [string length "abcd"] + 0.0 )}
expr {20.0/5.0}
String values may be used as operands of the comparison operators, although the expression evaluator tries to do comparisons as integer or floating-point when it can, except in the case of the eq and ne operators. If one of the operands of a comparison is a string and the other has a numeric value, a canonical string representation of the numeric operand value is generated to compare with the string operand. Canonical string representation for integer values is a decimal string format. Canonical string representation for floating-point values is that produced by the %g format specifier of Tcl's format command. For example, the commands
expr {"0x03" > "2"}
expr {"0y" < "0x12"}
Enclose expressions in braces for the best speed and the smallest storage requirements. This allows the Tcl bytecode compiler to generate the best code.
As mentioned above, expressions are substituted twice: once by the Tcl parser and once by the expr command. For example, the commands
set a 3
set b {$a + 2}
expr $b*4
Most expressions do not require a second round of substitutions. Either they are enclosed in braces or, if not, their variable and command substitutions yield numbers or strings that do not themselves require substitutions. However, because a few unbraced expressions need two rounds of substitutions, the bytecode compiler must emit additional instructions to handle this situation. The most expensive code is required for unbraced expressions that contain command substitutions. These expressions must be implemented by generating new code each time the expression is executed. When the expression is unbraced to allow the substitution of a function or operator, consider using the commands documented in the mathfunc(n) or mathop(n) manual pages directly instead.
Define a procedure that computes an “interesting” mathematical function:
proc tcl::mathfunc::calc {x y} {
expr { ($x**2 - $y**2) / exp($x**2 + $y**2) }
}
Convert polar coordinates into cartesian coordinates:
# convert from ($radius,$angle)
set x [expr { $radius * cos($angle) }]
set y [expr { $radius * sin($angle) }]
Convert cartesian coordinates into polar coordinates:
# convert from ($x,$y)
set radius [expr { hypot($y, $x) }]
set angle [expr { atan2($y, $x) }]
Print a message describing the relationship of two string values to each other:
puts "a and b are [expr {$a eq $b ? {equal} : {different}}]"
Set a variable to whether an environment variable is both defined at all and also set to a true boolean value:
set isTrue [expr {
[info exists ::env(SOME_ENV_VAR)] &&
[string is true -strict $::env(SOME_ENV_VAR)]
}]
Generate a random integer in the range 0..99 inclusive:
set randNum [expr { int(100 * rand()) }]
array(n), for(n), if(n), mathfunc(n), mathop(n), namespace(n), proc(n), string(n), Tcl(n), while(n)
arithmetic, boolean, compare, expression, fuzzy comparison
Copyright (c) 1993 The Regents of the University of California. Copyright (c) 1994-2000 Sun Microsystems Incorporated. Copyright (c) 2005 by Kevin B. Kenny <kennykb@acm.org>. All rights reserved.
| 8.5 | Tcl |