C

fahrenheit to celsius formula

cels = (fahr - 32.0) * 5.0/9.0; //Fahr to cels
fahr = (cels * 9.0/5.0) + 32.0; //Cels to fahr  

celsius to fahrenheit formula

fahr = celsius * (9.0/5.0) + 32.0;

celsius to fahrenheit formula

float cel;
printf("Enter celsius value: ");
scanf("%f", &cel);

printf("Fahrenhit value is: %f", cel * (9 / 5) + 32);