Objective-C Programming: The Big Nerd Ranch Guide

return

Many functions return a value when they complete execution. You know what type of data a function will return by the type that precedes the function name. (If a function does not return anything, its return type is void.)

Create a new C Command Line Tool named Degrees. In main.c, add a function before main() that converts a temperature from Celsius to Fahrenheit. Then update main() to call the new function.

#include <stdio.h>

float fahrenheitFromCelsius(float cel)
{
    float fahr = cel * 1.8 + 32.0;
    printf("%f Celsius is %f Fahrenheit\n", cel, fahr);
    return fahr;
}

int main(int argc, const char * argv[])
{
    float freezeInC = 0; float freezeInF = fahrenheitFromCelsius(freezeInC); printf("Water freezes at %f degrees Fahrenheit.\n", ...