Question

1. Write a C++ program that take 2 inputs: x, y and one of 4 mathematical operators: +, -, *, /. If it is ‘+’, print out the sum of a and b. If it is ‘-‘, print out a – b. If it is ‘*’, print out a*b. If it is ‘/’ print out a/b, but if b < 0, print out illegal input.

Answer 1

Code is :

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#include <iostream>

using namespace std;

int
main ()
{
double x, y;           //varible declaration of x and y
char oper;           //varible declaration of operator
cout << "Enter x:";
cin >> x;           //enter x
cout << "Enter y:";
cin >> y;           //enter y

while (y < 0)
{               //given if y < 0 invalid input and try again
cout << "Illegal input" << endl;
cout << "Enter y:";
cin >> y;
}

cout << "Enter your operator:";
cin >> oper;           //enter operator

while (oper != '+' && oper != '-' && oper != '*' && oper != '/')
{               //if not valid try again

cout << "Invalid operator" << endl;
cout << "Enter your operator:";
cin >> oper;

}

if (oper == '+')       //if + then print a+b
cout << x + y;

if (oper == '-')       //if - then print a-b
cout << x - y;

if (oper == '*')       //if * then print a*b
cout << x * y;

if (oper == '/')//if / then print a/b
cout << x / y;
return 0;
}

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Screenshot of code

Output: