Computer Science A - assert() - 2/29/00

#include<assert.h>

assert - An errer checking function that when called consists of the
         assert identifier, a logical expression, followed by a
         semi-colon.

         If the logical expression is false, then the program will
         end & an error message issued.

         If the logical expression is true, nothing happens and the
         program proceeds to the next statement.

Example:
    if(infile.fail())
    {
        cout<<"Input file did not open\n";
        exit();
    }

    This checks to see if an input file did open.

Or:

    assert(!infile.fail())
    This will accomplish the same. We are asserting that the file
    opening did not fail.