25.1 整数值

#include <stdio.h>
#include <stdlib.h>
int main()
{
    int celsius, fahr;
    printf ("Enter temperature in Fahrenheit:\n");
    if (scanf ("%d", &fahr)!=1)
    {
        printf ("Error while parsing your input\n");
        exit(0);
    };
    celsius = 5 * (fahr-32) / 9;
    if (celsius<-273)
    {
        printf ("Error: incorrect temperature!\n");
        exit(0);
    };
    printf ("Celsius: %d\n", celsius);
};