gawk 3.1.6

Version of implementation gawk of programming language AWK

A version of gawk interpreter.

Examples:

Hello, World! - AWK (146):

The printing is done with BEGIN pattern, i.e., before processing the input.

BEGIN { print "Hello, World!" }

Factorial - AWK (147):

This example uses iterative factorial definition. Individual statements within code block can be separated with semicolons (;) or new lines.

BEGIN {
    f = 1
    print "0! = " f
    for (i=1; i<17; i++) {
        f *= i
        print i "! = " f
    }
}

Fibonacci numbers - AWK (148):

This example uses iterative definition of Fibonacci numbers. fib is an associative array, and pr is a string.

BEGIN {
    fib[1] = 1
    fib[2] = 1
    for (i=3; i<17; i++)
        fib[i] = fib[i-1]+fib[i-2]
    pr = ""
    for (i=1; i<17; i++)
        pr = pr fib[i] ", "
    print pr "..." 
}

Quadratic equation - AWK (203):

{   A = $1
    B = $2
    C = $3
    if (A == 0) 
        print "Not a quadratic equation"
    else
    {   D = B*B-4*A*C
        if (D == 0)
            print "x = " (-B/2/A)
        else if (D > 0)
        {   print "x1 = " ((-B+sqrt(D))/2/A)
            print "x2 = " ((-B-sqrt(D))/2/A)
        }
        else
        {   print "x1 = (" (-B/2/A) "," (sqrt(-D)/2/A) ")"
            print "x1 = (" (-B/2/A) "," (-sqrt(-D)/2/A) ")"
        }
    }
}