01  #include <stdio.h>
02  
03  float f_to_c(float f);
04  int main()
05   { 
06    float ftemp;
07    float ctemp;
08      
09   printf("Enter temperature in degrees F : ");
10   scanf("%f", &ftemp);
11   ctemp = f_to_c(ftemp);
12   printf("Temp in degrees F = %3.lfn", ftemp);
13   printf("Temp in degrees C = %3.lfn", ctemp);
14   
15   return 0;
16    }
17  
18   /* This routine converts degrees F to degrees C */
19   float f_to_c (float f)
20   {
21   return ((f - 32.0) * 5.0/9.0);
22   }

OUTPUT

Enter temperature in degrees F : 212
Temp in degrees F = 212
Temp in degrees C = 100