12. Integer division in old programming languages

• Oldest programming languages produce a complete result in integer division.

• 10/3 equals 3

• When calculating Fahrenheit to Celsius, I will need to modify my program a bit if I use C or Java.

12.1. Converting degrees using C

#include <stdio.h>

    int main(void){
        float F, C;
        printf("Fahrenheit: ");
        scanf("%f", &F);
        C = 5.0 * (F - 32.0) / 9.0;
        printf("Celsius: %2.1f\n", C);
    }

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