C++ for loop

In C++, a for loop is used to repeat a block of code a certain number of times. It consists of three main parts:

1. Initialization: This part is executed once at the start of the loop. It usually initializes a counter variable.

2. Condition: This is evaluated before each iteration. If it evaluates to true, the loop continues; if false, the loop terminates.

3. Increment/Decrement: This part is executed after each iteration. It typically updates the counter variable.

Syntax:

for (initialization; condition; increment/decrement) {
    // code to be executed in each iteration
}

Example:

#include <iostream>
using namespace std;

int main() {
    // for loop starts with initialization of i = 1, continues while i <= 5, and increments i by 1 each time
    for (int i = 1; i <= 5; i++) {
        cout << i << endl;  // prints the value of i in each iteration
    }

    return 0;
}

Output:

Explanation:

• Initialization: int i = 1 initializes the loop variable i to 1 before the loop starts.
• Condition: i <= 5 checks whether i is less than or equal 5. If this condition is true, the loop executes; if false, the loop exits.
• Increment: i++ increases the value of i by 1 after each iteration.

Example: Print the table of 2 through for loop

#include <iostream>
using namespace std;

int main() {
    
    for (int i = 2; i <=20; i=i+2) 
    {
     cout << i << endl;
    }
    return 0;
}

Output: