exc/k&r/01-a-tutorial-introduction/01-05.c

#include <stdio.h>

#define LOWER 0
#define UPPER 300
#define STEP 20

main()
{
    int fahr;

    for (fahr = UPPER; fahr >= LOWER; fahr = fahr - STEP)
        printf("%3d %6.1f\n", fahr, (5.0 / 9.0) * (fahr - 32));
}