3.7

/* Farenheit to Celsius
*/
#include <stdio.h>
#define F2CTranslate -32
#define F2CDilate 5.0/9
#define M2K 1.609
#define P2G 0.454
#define C2FTranslate 32
#define C2FDilate 9.0/5

int
main(int argc, char *argv[]) {
	double input, output;
	char c;
	printf("Enter value to convert: ");
	scanf("%lf %c", &input, &c);
	switch(c) {
		case 'f':
		case 'F':
			output = (input + F2CTranslate)*F2CDilate;
			printf("%.2f Farenheit is %.2f Celsius\n", input, output);
			break;
		case 'C':
		case 'c':
			output = input*C2FDilate + C2FTranslate;
			printf("%.2f Celsius is %.2f Farenheit\n", input, output);
			break;
		case 'k':
		case 'K':
			output = input/M2K;
			printf("%.2f Kilometres is %.2f Miles\n", input, output);
			break;
		case 'm':
		case 'M':
			output = input*M2K;
			printf("%.2f Miles is %.2f Kilometres\n", input, output);
			break;
		case 'p':
		case 'P':
			output = input*P2G;
			printf("%.2f Pounds is %.2f Kilograms\n", input, output);
			break;
		case 'g':
		case 'G':
			output = input/P2G;
			printf("%.2f Kilograms is %.2f Pounds\n", input, output);
			break;
		default:
			printf("Invalid units, accepted units are Farenheit(f), Celsius(c), Kilometres(k), \n Miles(m), Pounds(p) and Kilograms(g)\n");
			break;
	}
	return 0;
}