PROGRAM 30

Object

Write a program to interconvert the temperature scales using Menu options.

Algorithm

1. Declare integer variable i and float variables c, f and k.
2. Read i (consider i as switch variable).
3. IF switch variable = 1
   •  Read c.
   •  Convert Celsius to Fahrenheit using f = 32+ (9/5) c.
4. IF switch variable = 2
   •  Read f.
   •  Convert Fahrenheit to Celsius using c = (5/9)(f – 32)
5. IF switch variable = 3
   • Read c.
   •  Convert Celsius to Kelvin using k = c + 273.15.
6. IF switch variable = 4
   • Read f.
   •  Convert Fahrenheit to Kelvin using k = (5/9)(f – 32) + 273.15.
7. ELSE
   •  Write Invalid switch variable.
8. Exit.

Flowchart

C++ Source Code

// program 30
#include <iostream>
using namespace std;
int main()
{
    int i;
    float c, f, k;

    cout << "\n\n\n";
    cout << "\t\t\tMENU FOR TEMPERATURE SCALE CONVERSION";
    cout << "\n\t\t\t_____________________________________\n\n";

    cout << "1. From Celsius to Fahrenheit scale\n";
    cout << "2. From Fahrenheit to Celsius scale\n";
    cout << "3. From Celsius to Kelvin scale\n";
    cout << "4. From Fahrenheit to Kelvin scale\n";
    cout << "\nEnter the MENU option: ";
    cin >> i;

    switch (i)
    {
    case 1:
        cout << "Enter temperature in Celsius: ";
        cin >> c;
        f = 32.0+(9.0/5.0)*c;
        cout << "The temperature in Fahrenheit is = " << f;
        break;
    case 2:
        cout << "Enter temperature in Fahrenheit: ";
        cin >> f;
        c = 5.0/9.0*(f-32.0);
        cout << "The temperature in Celsius is = " << c;
        break;
    case 3:
        cout << "Enter temperature in Celsius: ";
        cin >> c;
        k = c + 273.15;
        cout << "The temperature in Kelvin is = " << k;
        break;
    case 4:
        cout << "Enter temperature in Fahrenheit: ";
        cin >> f;
        k = (5.0/9.0*(f-32.0)) + 273.15;
        cout << "The temperature in Kelvin is = " << k;
        break;
    default:
        cout << "Invalid MENU option\n\n";
    }
    return 0;
}

C Source Code

/*program 30*/
#include<stdio.h>
int main()
{
  int i;
  float c, f, k;
  printf("\n\n\n");
  printf("\t\t\tMENU FOR TEMPERATURE SCALE CONVERSION");
  printf("\n\t\t\t_____________________________________\n\n");
  printf("1. From Celsius to Fahrenheit scale\n");
  printf("2. From Fahrenheit to Celsius scale\n");
  printf("3. From Celsius to Kelvin scale\n");
  printf("4. From Fahrenheit to Kelvin scale\n");
  printf("\nEnter the MEMU option: ");
  scanf("%d", &i);
  switch(i)
    {
    case 1:
      printf("Enter temperature in Celsius: ");
      scanf("%f", &c);
      f = 32.0+(9.0/5.0)*c;
      printf("The temperature in Fahrenheit is = %.2f", f);
      break;
    case 2:
      printf("Enter temperature in Fahrenheit: ");
      scanf("%f", &f);
      c = 5.0/9.0*(f-32.0);
      printf("The temperature in Celsius is = %.2f", c);
      break;
    case 3:
      printf("Enter temperature in Celsius: ");
      scanf("%f", &c);
      k = c + 273.15;
      printf("The temperature in Kelvin is = %.2f", k);
      break;
    case 4:
      printf("Enter temperature in Fahrenheit: ");
      scanf("%f", &f);
      k = (5.0/9.0*(f-32.0)) + 273.15;
      printf("The temperature in Kelvin is = %.2f", k);
      break;
    default:
      printf("Invalid MENU option\n\n");
    }
  return 0;
} 

Output

MENU FOR TEMPERATURE SCALE CONVERSION

1. From Celsius to Fahrenheit scale
2. From Fahrenheit to Celsius scale
3. From Celsius to Kelvin scale
4. From Fahrenheit to Kelvin scale

Enter the MENU option: 2
Enter temperature in Fahrenheit: 145.3
The temperature in Celsius is = 62.9444