#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <float.h>
#include <excpt.h>

int main( int argc, char **argv ) {
    unsigned int  u = _controlfp(0, 0);
    double x = 0.5e-323, y = 0.5e-323;

    printf( "x contains: %g before dividing by 2\n", x );
    x /= 2;
    printf( "x now contains: %g\n", x );

    u = u & ~_EM_UNDERFLOW;
    _controlfp(u, _MCW_EM);

    printf( "\ny contains: %g before dividing by 2\n", y );
    __try {
        y /= 2;
    }
    __except( EXCEPTION_EXECUTE_HANDLER ) {
        printf( "Floating point underflow exception occurred\n");
    }
    printf( "y now contains: %g\n", y );
    return 0;
}

##</code><code>##

C:\test>intOverflow.exe
x contains: 4.94066e-324 before dividing by 2
x now contains: 0

y contains: 4.94066e-324 before dividing by 2
Floating point underflow exception occurred
y now contains: 4.94066e-324