how to check if there is a division by zero in c

Question

#include
void function(int);

int main()
{
     int x;

     printf(\"Enter x:\");
     scanf(\"%d\", &x);

function(x);

return 0;
}

void functi         


        

Answer 1

By default in UNIX, floating-point division by zero does not stop the program with an exception. Instead, it produces a result which is infinity or NaN. You can check that neither of these happened using isfinite.

x = y / z; // assuming y or z is floating-point
if ( ! isfinite( x ) ) cerr << "invalid result from division" << endl;

Alternately, you can check that the divisor isn't zero:

if ( z == 0 || ! isfinite( z ) ) cerr << "invalid divisor to division" << endl;
x = y / z;