Calculations

Explanation for Remainder Of Division

Let's start with a program that reads width and height of a rectangle and prints it's area.

#include <iostream> using namespace std; int main() { double width; double height; // Read inputs: cin >> width; cin >> height; // Calc Area: double area = width * height; cout << "Area = " << area; }

Input:

3 2

Output:

Area = 6

Explanation

• At line 11 and 12 width and height are red.
• At line 15 width and height are multiplied (via * operator).

Let's demonstrate the rest of the operators:

#include <iostream> #include <string> using namespace std; int main() { int a; int b; cin >> a; cin >> b; cout << "A = " << a << endl; cout << "B = " << b << endl; cout << "A + B = " << a + b << endl; cout << "A - B = " << a - b << endl; cout << "A * B = " << a * b << endl << endl; cout << "Remainder of Division:" << a % b << endl << endl; cout << "Concat strings: " << endl; string str1 = "Web "; string str2 = "Technologies"; cout << str1 + str2 << endl; string numericStr1 = "1"; string numericStr2 = "2"; cout << "1 + 2 = " << numericStr1 + numericStr2; }

Input:

5 2

Output:

A = 5 B = 2 A + B = 7 A - B = 3 A * B = 10 Remainder of Division:1 Concat strings: Web Technologies 1 + 2 = 12

Notice that + operator can be applied to both numeric and string variables.