Author: admin

In this tutorial, we will write a C program for currency conversion. Before that, you may go through the following topic in C.

• C operators
• Switch Case in C

Explanation: In this program, there is a use of switch statements in C. The program gives the user choice for the conversion. For this example, we have taken four currencies those are Rupee, Dollar, Pound and Euro.

There are four cases for each currency conversion. You can modify the value of a currency with the actual current value.

Currency Conversion Program in C

#include <stdio.h>

int main()
{
  float amount;
  float rupee, dollar, pound, euro;
  int choice;

  printf("Following are the Choices:");
  printf("\nEnter 1: Ruppe");
  printf("\nEnter 2: Dollar");
  printf("\nEnter 3: Pound");
  printf("\nEnter 4: Euro");

  printf("\nEnter your choice: ");
  scanf("%d", &choice);

  printf("Enter the amount you want to convert?\n");
  scanf("%f", &amount);

  switch (choice)
  {
    case 1: // Ruppe Conversion
        dollar = amount / 70;
        printf("%.2f Rupee =  %.2f dollar", amount, dollar);

        pound = amount / 88;
        printf("\n%.2f Rupee =  %.2f pound", amount, pound);

        euro = amount / 80;
        printf("\n%.2f Rupee =  %.2f euro", amount, euro);
        break;

    case 2: // Dollar Conversion
        rupee = amount * 70;
        printf("\n%.2f Dollar =  %.2f rupee", amount, rupee);

        pound = amount *0.78;
        printf("\n%.2f Dollar =  %.2f pound", amount, pound);

        euro = amount *0.87;
        printf("\n%.2f Dollar =  %.2f euro", amount, euro);
        break;

    case 3: // Pound Conversion
        rupee = amount * 88;
        printf("\n%.2f Pound =  %.2f rupee", amount, rupee);

        dollar = amount *1.26;
        printf("\n%.2f Pound =  %.2f dollar", amount, dollar);

        euro = amount *1.10;
        printf("\n%.2f Pound =  %.2f euro", amount, euro);
        break;

    case 4: // Euro Conversion
        rupee = amount * 80;
        printf("\n%.2f Euro =  %.2f rupee", amount, rupee);

        dollar = amount *1.14;
        printf("\n%.2f Euro =  %.2f dollar", amount, dollar);

        pound = amount *0.90;
        printf("\n.2%f Euro =  %.2f pound", amount, pound);
        break;

     //Default case
    default:
        printf("\nInvalid Input");
  }

  return 0;
}

Output:

Following are the Choices:
Enter 1: Ruppe
Enter 2: Dollar
Enter 3: Pound
Enter 4: Euro
Enter your choice: 2
Enter the amount you want to convert?
7

7.00 Dollar = 490.00 rupee
7.00 Dollar = 5.46 pound
7.00 Dollar = 6.09 euro

There is a use of “%.2f” which means only two digits after the decimal value will be displayed.

In this tutorial, we will write a C program to find the area of a rectangle. Before that, you may go through the following topic in C.

• C operators

Explanation: The program asks the user to enter the value of length and breadth as an input. Then simply using the formula (area = length * breadth), we calculate the area of a rectangle in C.

C Program to find the area of a Rectangle

#include <stdio.h>

int main()
{
  int len, br, area;

  printf("Enter the length: ");
  scanf("%d", &len);
  printf("Enter the breadth: ");
  scanf("%d", &br);

  area = len * br;
  printf("Area of a rectangle: %d", area);

  return 0;
}

Output:

Enter the length: 2
Enter the breadth: 5
Area of a rectangle: 10

You may change the data type int to float or any other as per your requirements.