ex3_01.c

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/* Exercise 3.1 Convert temperatures */
#include <stdio.h>

int main(void)
{
  int choice = 0;
  double temperature = 0.0;
  printf("This program can do the following:\n"
         "1. Convert from degrees Centigrade to degrees Fahrenheit\n"
         "2. Convert from degrees Fahrenheit to degrees Centigrade\n"
         "Select the conversion (1 or 2): ");
  scanf("%d", &choice);

  printf("Enter a temperature in degrees %s: ",
                          (choice == 1 ?  "Centigrade" : "Fahrenheit"));
  scanf("%lf", &temperature);

  if(choice == 1)
    printf("That is equivalent to %.2lf degrees Fahrenheit\n", temperature*9.0/5.0+32.0);
  else
    printf("That is equivalent to %.2lf degrees Centigrade\n", (temperature-32.0)*5.0/9.0);
  return 0;
}