C - Celcius to Fahrenheit

#include <stdio.h>
#include <stdlib.h>

#define STEP 20

int main()
{
    const int LOWER = 0;
    const int UPPER = 300;

    int cel;
    float fahr;

    printf("Celsius to Fahrenheit Converter\n");
    printf("C\tF\n");

    for(cel = LOWER;cel < UPPER;cel += STEP){
        fahr = cel * 9/5 + 32;
        printf("%d\t%g\n", cel, fahr);
    }

    return 0;
}