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

====== assert ======
<code cpp>
    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 () \\

===== cpp Sourcecode Example =====
    
<code cpp>
#include <iostream> /* including standard library */
#include <cassert>

using namespace std;

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

int main ( void ) {
cout << "9 / 4 = " << testfunc(9, 4) << endl;
cout << "1 / 0 =  " << testfunc(1, 1) << endl;
cout << "1 / 0 = " << testfunc(0, 9) << endl;
return 0;
}
</code>


=====  Output =====

    9 / 4 = 2
    1 / 0 = 1
    assert: assert.cpp:7: testfunc: Assertion `(a >= 0 && a >= b) && (b >= 0)' failed.
    canceled