#include <stdio.h>
main()
{
	int fahr, celsius;
	int lower,upper,step;

	lower = 0;
	upper = 300;
	step = 20;

	fahr = lower;
	while(fahr<=upper){
		celsius = 5 * (fahr-32) / 9;
		printf("%d\t%d\n", fahr,celsius);
		fahr = fahr + step;
	}
}

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This program show two columns of temperature. In left - t of celsius, in right - t. of fahr.

Celsius -> Fahr

c

C