Write a calculator program in C++

This program add and subtract two integers read from the keyboard

Source Code:

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#include <iostream.h> #include <conio.h> #include <iomanip> using namespace std; // Prototype Declaration int add (int a, int b); int subt (int a, int b); int main () { // Prompt user for input and get data cout << "\n Enter two integer numbers: "; // Read numbers into a and b int a, b; cin >> a >> b ; // Calculate the sum and difference int sum = add (a, b); int diff = subt (a, b); cout << setw(5) << a << " + " << b << " = " << sum << endl; cout << setw(5) << a << " - " << b << " = " << diff << endl; // Close Program getch(); return 0; } // main /* =============== add ===================== This function adds two integer and returns the sum Pre Parameter a and b Post Returns a + b */ int add (int a, int b) { return (a + b); } // add /* =============== subt ===================== Returns the difference of two integer Pre Parameter a and b Post Returns a - b */ int subt (int a, int b) { return (a - b); } // subt

Result:

 Enter two integer numbers: 5  10
    5  +  10  =  15
    5  -  10  =  -5