Temperature Converter in C

[sourcecode language=’cpp’]
#include <stdio.h>
#include <stdlib.h>

void printUsage();
float toCelsius(float fahrenheit);
float toFahrenheit(float celsius);

int main(int argc, char ** argv){
float value = 0.0f;
if(argc < 3 || argc > 3){
printUsage();
return -1;
}
switch(argv[1][0]){
case ‘c’:
value = toCelsius(atof(argv[2]));
printf(“%s Degrees Fahrenheit is equal to %f Degrees Celsius\n”,argv[2],value);
break;
case ‘f’:
value = toFahrenheit(atof(argv[2]));
printf(“%s Degrees Celsius is equal to %f Degrees Fahrenheit\n”,argv[2],value);
break;
default:
printUsage();
return -1;
break;
}
return 0;
}

void printUsage(){
printf(“Usage: temp [c/f] value\n”);
}

float toCelsius(float fahrenheit){
return (fahrenheit -32) * (5.0f/9.0f);
}
float toFahrenheit(float celsius){
return (celsius) * (9.0f/5.0f) + 32;
}
[/sourcecode]

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