C Interview Questions and Answers

 

How can I ensure that integer arithmetic doesnt overflow?

The usual approach is to test the operands against the limits in the header file
<limits.h> before doing the operation. For example, here is a ``careful''
addition function:





int



chkadd(int a, int b)



{



if(INT_MAX - b < a) {



fputs("int overflown", stderr);



return INT_MAX;



}



return a + b;



}

Posted by:Richards