21 Jan C++ User Input

The cin is used in C++ for User Input.  It is used to read the data input by the user on the console. Let us see an example C++ program to get input from the user.

C++ program to print a string entered by the user

Let us see an example to print a string entered by the user:

#include <iostream>
using namespace std;

int main() {

  // Declaring Variables
  string str;
  
  # Asks the user to enter a string
  cout << "Enter a string = ";
  cin >> str;
  
  # Displays the string entered by the user above
  cout <<"\nThe string entered by user = "<< str;
  
  return 0;
}

Output

Enter a string = 
The string entered by user = amit

C++ program to print numbers entered by the user

Let us see an example to multiply 3 numbers entered by the user:

#include <iostream>
using namespace std;

int main() {

  // Declaring Variables
  int a, b, c, res;
  
  cout << "Enter number1 = ";
  cin >> a;
  cout << "Enter number2 = ";
  cin >> b;
  cout << "Enter number3 = ";
  cin >> c;
  
  // Calculate Multiplication
  res = a * b * c;
  
  cout <<"\nMultiplication Result = "<< res;
  
  return 0;
}

Output

Enter number1 = 5
Enter number2 = 10
Enter number3 = 15
Multiplication Result = 750