{{keywords>wiki library source code example reference}}

====== assert ======
<code c>
    void assert(scalar expression);
</code>    
With assert you can test your programm for logical errors.  \\
\\
The assert () macro will insert diagnostics into programs \\

When executed, if expression (which is a scalar type you have) is false (ie, compares equal to 0), \\
assert (), provide information about the particular call that failed to stderr and abort () \\

===== C Sourcecode Example =====
    
<code c>
#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */
#include <assert.h>

int testfunc(int a, int b) {
   assert( (a >= 0 && a >= b) && (b >= 0) );
   return a / b;
}

int main ( void ) {
printf("9 / 4 = %d\n", testfunc(9, 4) );
printf("1 / 1 = %d\n", testfunc(1, 1) );
printf("0 / 9 = %d\n", testfunc(0, 9) );
return 0;
}
</code>


=====  Output =====

    user@host:~$ ./assert 
    9 / 4 = 2
    1 / 1 = 1
    assert: assert.c:6: testfunc: Assertion `(a >= 0 && a >= b) && (b >= 0)' failed.
    canceled