Question

Write a menu driven program to perform arithmetic operations on two integers. The menu should be repeated until user selects “STOP” option. Program should have independent user defined functions for each case.

Answer 1

#include<stdio.h>
#include<conio.h>
void main()
{
int operator,ans;
double firstNumber,secondNumber;
clrscr();
do
{
printf("Enter a operation:\n1.Addition\n2.Subtraction\n3.Multiplication\n4.Divison");
scanf("%d", &operator);
printf("Enter two operands: ");
scanf("%lf %lf",&firstNumber, &secondNumber);
switch(operator)
{
case 1:
printf("%.1lf + %.1lf = %.1lf",firstNumber, secondNumber, firstNumber + secondNumber);
break;
case 2:
printf("%.1lf - %.1lf = %.1lf",firstNumber, secondNumber, firstNumber - secondNumber);
break;
case 3:
printf("%.1lf * %.1lf = %.1lf",firstNumber, secondNumber, firstNumber * secondNumber);
break;

case 4:
printf("%.1lf / %.1lf = %.1lf",firstNumber, secondNumber, firstNumber / secondNumber);
break;
default:
printf("Error! operator is not correct");
}
printf("\nDo you want to continue 1.YES 2. NO");
scanf("%d",&ans);
}
while(ans==1);
getch();
}

Output:
Enter an Operation:
1. Addition
2. Subtraction
3. Multiplication
4. Division
       1
       Enter two operands 10 20
       10.0 + 20.0 = 30.0
       Do you want to continue 1.YES 2.NO 1
       Enter an operation
       1. Addition
       2. Subtraction
       3. Multiplication
       4. Division
       2
       Enter two operands: 50 60
       50.0 – 60.0 = -10.0
       Do you want to continue 1.YES 2.NO 2