C++ for Loop

Explanation (English): In C++ programming, the for loop is used when the number of iterations is known. It has three parts: initialization, condition, and increment/decrement.

Explanation (हिंदी): C++ प्रोग्रामिंग में for लूप तब इस्तेमाल किया जाता है जब हमें पता हो कि कोड कितनी बार चलाना है। इसमें तीन भाग होते हैं: प्रारंभ (initialization), शर्त (condition), और बढ़ोतरी/घटाव (increment/decrement)।

Print Numbers 1 to 5

#include <iostream>
using namespace std;

int main() {
  for(int i = 1; i <= 5; i++) {
    cout << i << endl;
  }
  return 0;
}

Sum of First 10 Natural Numbers

#include <iostream>
using namespace std;

int main() {
  int sum = 0;
  for(int i = 1; i <= 10; i++) {
    sum += i;
  }
  cout << "Sum = " << sum;
  return 0;
}

Even Numbers from 2 to 10

#include <iostream>
using namespace std;

int main() {
  for(int i = 2; i <= 10; i += 2) {
    cout << i << " ";
  }
  return 0;
}

Print Digits of a Number in Reverse

#include <iostream>
using namespace std;

int main() {
  int num = 1234;
  for(; num > 0; num /= 10) {
    cout << num % 10 << endl;
  }
  return 0;
}

Factorial of a Number

#include <iostream>
using namespace std;

int main() {
  int fact = 1;
  for(int i = 1; i <= 5; i++) {
    fact *= i;
  }
  cout << "Factorial = " << fact;
  return 0;
}

Print Alphabets A to Z

#include <iostream>
using namespace std;

int main() {
  for(char ch = 'A'; ch <= 'Z'; ch++) {
    cout << ch << " ";
  }
  return 0;
}

Check Prime Number

#include <iostream>
using namespace std;

int main() {
  int n = 7;
  bool isPrime = true;
  for(int i = 2; i < n; i++) {
    if(n % i == 0) {
      isPrime = false;
      break;
    }
  }
  if(isPrime)
    cout << "Prime";
  else
    cout << "Not Prime";
  return 0;
}

Power of 2 Table

#include <iostream>
using namespace std;

int main() {
  int power = 1;
  for(int i = 0; i <= 5; i++) {
    cout << "2^" << i << " = " << power << endl;
    power *= 2;
  }
  return 0;
}

Countdown from 5 to 1

#include <iostream>
using namespace std;

int main() {
  for(int i = 5; i > 0; i--) {
    cout << i << endl;
  }
  cout << "Go!" << endl;
  return 0;
}

Reverse a Number

#include <iostream>
using namespace std;

int main() {
  int num = 123, rev = 0;
  for(; num != 0; num /= 10) {
    rev = rev * 10 + num % 10;
  }
  cout << "Reverse = " << rev;
  return 0;
}

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