This program ask input in degree celsius and gives output in fahrenheit and Kelvin
#include <stdio.h>
#include <math.h>
main () {
float c, fe, k;
printf ("Enter the temperature in Degree Celsius:");
scanf ("%f", &c);
fe = 1.8 * c + 32;
k = 273 + c;
printf ("The temperature in Fahrenheit is:%f\n", fe);
printf ("The temperature in Kelvin is:%f\n", k);
getch ();
}
Output::---
Enter the temperature in Degree Celsius: 20.0
The temperature in Fahrenheit is: 68.0
The temperature in Kelvin is: 293.0
How it works
After getting value in degree celsius, it calculate Fahrenheit and Kelvin by using conversion formula shown in the above program.