Example: C Program to Convert Celsius to Fahrenheit using Functions

#include <stdio.h>

​

// This function will convert celsius to fahrenheit

float ToFahrenheit(float c) {

    return (c * 9 / 5) + 32;

}

​

// It's the driver function

int main() {

    float c;  // To store the celsius

    int i = 1;

​

    printf("Enter the temperature in Celsius::\n");

    scanf("%f", &c);

​

    // Final Output

    printf("\n%f Celsius = %f Fahrenheit\n", c, ToFahrenheit(c));

    return 0;

}