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#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
...
    printf( "y now contains: %g\n", y );
    return 0;
}

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C:\test>intOverflow.exe
x contains: 4.94066e-324 before dividing by 2
...
y contains: 4.94066e-324 before dividing by 2
Floating point underflow exception occurred
y now contains: 4.94066e-324