Question

Please have a look at this code:

#include <stdio.h>

int main(void)
{
    short s;
    int i = 65696;
    float f = 65696.0F;

    printf("sizeof(short) = %lu\n", sizeof(short));

    s = i;
    printf("s = %hd\n", s);
    s = f;
    printf("s = %hd\n", s);

    s = 65696;
    printf("s = %hd\n", s);
    s = 65696.0F;
    printf("s = %hd\n", s);

    return 0;
}  

It gave output as :

sizeof(short) = 2
s = 160
s = 160
s = 160
s = 32767

In last line why it’s 32767 and not 160 ? What’s the difference between saying f = 65696.0F; s = f; and s = 65696.0F; ?

Answer 1

Because if the integral part of the float value is not representable in the new type, the conversion is undefined behavior.

In your case, SHRT_MAX is probably 32767 and so the integral part of 65696.0F is then not representable in a short object.