3. Create a basic calculator with menus.

    #include <stdio.h>
    #include <conio.h>
    #include <stdlib.h>

    void main()
    {
        int num1, num2, result, choice;
        clrscr();
        printf("\nEnter two numbers\n");
        scanf("%d%d", &num1, &num2);
    
        printf("\n*******************\n");
        printf("* 1. Swapping       *\n");
        printf("* 2. Addition       *\n");
        printf("* 3. Subtraction    *\n");
        printf("* 4. Multiplication *\n");
        printf("* 5. Division       *\n");
        printf("* 6. Exit           *\n");
        printf("*******************\n");
        do
        {
            printf("\n\nMake Your Choice:");
            scanf("%d", &choice);
        
            switch (choice)
            {
            case 1:
            
                result = num1;
                num1 = num2;
                num2 = result;
                printf("\nThe Swipping is %d %d", num1, num2);
                break;
            case 2:
                result = num1 + num2;
                printf("\n The Addition of %d and %d is %d", num1, num2, result);
                break;
            case 3:
                result = num1 - num2;
                printf("\n The Subtraction of %d and %d is %d", num1, num2, result);
                break;
            case 4:
                result = num1 * num2;
                printf("\n The Multiplication of %d and %d is %d", num1, num2, result);
                break;
            case 5:
                result = num1 / num2;
                printf("\n The Division of %d and %d is %d", num1, num2, result);
                break;
            case 6:
                exit(0);
                break;
            default:
                printf("\nWrong Entry\n ");
                break;
            }
          
        } while (1);
    }