Variables and Input examples in C++ Language

Here are some Variables and Input examples in C++ Language

Simple Integer Input and Output:

#include <iostream>

using namespace std;

int main() {

int number;

cout<<"Enter an integer : ";

cin>>number;

cout<<"You entered : "<<number <<endl;

return 0;

}

• ' int number; ' : Declares a variable named ' number ' to store an integer.

• ' cout<< "Enter an integer : "; ' : Asks the user to input an integer.

• ' cin>> number; ' : Reads the entered integer from the user.

• ' cout << " You entered : " << number << endl; ' : Displays the entered integer.

Sum of Two Integers:

#include <iostream>

using namespace std;

int main() {

int num1, num2, sum;

cout<<"Enter the first integer : " ;

cin>> num1;

cout<<"Enter the second integer : ";

cin>>num2;

sum = num1 + num2;

cout<<"Sum : " <<sum <<endl;

return 0;

}

• ' int num1, num2, sum; ' : Declares three integer variables to store two input numbers and their sum.

• Asks the user to input two integers separately.

• Calculates the sum of the entered integers (' sum = num1 + num2; ').

• Displays the calculated sum.

Check if an Integer is Even or Odd:

#include <iostream>

using namespace std;

int main() {

int number;

cout<<"Enter an integer : ";

cin>> number;

if (number % 2 == 0) {

cout<<number <<" is even. " <<endl;

} else {

cout<<number <<" is odd. " <<endl;

}

return 0;

}

• Checks if an entered integer is even or odd using the modulo operator ('%').

• If the remainder when dividing by 2 is 0, it's even; otherwise, it's odd.

• Displays whether the entered numer is even or odd.

Average of Three Integers:

#include <iostream>

using namespace std;

int main() {

int num1, num2, num3;

double average;

cout<<"Enter the first integer : ";

cin>>num1;

cout<<"Enter the second integer : ";

cin>>num2;

cout<<"Enter the third integer : ";

cin>>num3;

average = static_cast<double>(num1 + num2 + num3) / 3;

cout<<"Average : " <<average <<endl;

return 0;

}

• Adds three integers entered by the user(' num1 ', ' num2 ', ' num3 ').

• Calculates the average by dividing the sum by 3, using ' static_cast<double> ' to ensure a decimal result.

• Displays the calculated average.

Simple String Input and Output:

#include <iostream>

using namespace std;

int main() {

string name;

cout<<"Enter your name : ";

getline(cin, name);

cout<<"Hello, " <<name <<" ! " <<endl;

return 0;

}

• ' string name; ' : Declares a variable named ' name ' to store a string.

• ' cout<<"Enter your name : "; ' Asks the user to input their name.

• ' getline(cin, name); ' : Reads the entered string from the user, including spaces.

• ' cout<<"Hello, " <<name <<" ! " <<endl; ' : Displays a greeting using the entered name.