You are covering a comprehensive list of C++ topics! 🚀 Here’s a breakdown of some key for loop examples with explanations.
🔄 For Loop in C++
The for loop is used when the number of iterations is known beforehand.
🔹 Syntax
for(initialization; condition; update) {
// Code to execute
}
- Initialization: Sets a starting value.
- Condition: The loop runs while this condition is
true. - Update: Updates the loop variable in each iteration.
1️⃣ Sum of Numbers using For Loop
📌 Find the sum of the first N numbers.
#include <iostream>
using namespace std;
int main() {
int n, sum = 0;
cout << "Enter a number: ";
cin >> n;
for (int i = 1; i <= n; i++) {
sum += i;
}
cout << "Sum = " << sum;
return 0;
}
🔹 Output
Enter a number: 5
Sum = 15
2️⃣ Sum of Two Squares using For Loop
📌 Calculate the sum of squares of numbers from 1 to N.
#include <iostream>
using namespace std;
int main() {
int n, sum = 0;
cout << "Enter a number: ";
cin >> n;
for (int i = 1; i <= n; i++) {
sum += (i * i);
}
cout << "Sum of squares = " << sum;
return 0;
}
🔹 Output
Enter a number: 3
Sum of squares = 14
3️⃣ Armstrong Number using For Loop
📌 Check if a number is an Armstrong number.
#include <iostream>
#include <cmath>
using namespace std;
int main() {
int num, sum = 0, temp, digit, digits = 0;
cout << "Enter a number: ";
cin >> num;
temp = num;
while (temp > 0) {
temp /= 10;
digits++;
}
temp = num;
for (; temp > 0; temp /= 10) {
digit = temp % 10;
sum += pow(digit, digits);
}
if (sum == num)
cout << num << " is an Armstrong number";
else
cout << num << " is not an Armstrong number";
return 0;
}
🔹 Output
Enter a number: 153
153 is an Armstrong number
4️⃣ Fibonacci Series using For Loop
📌 Generate Fibonacci series up to N terms.
#include <iostream>
using namespace std;
int main() {
int n, a = 0, b = 1, next;
cout << "Enter number of terms: ";
cin >> n;
cout << "Fibonacci Series: ";
for (int i = 1; i <= n; i++) {
cout << a << " ";
next = a + b;
a = b;
b = next;
}
return 0;
}
🔹 Output
Enter number of terms: 7
Fibonacci Series: 0 1 1 2 3 5 8
5️⃣ Printing Star Diamond Pattern
📌 Print a diamond shape using stars (*).
#include <iostream>
using namespace std;
int main() {
int n;
cout << "Enter the number of rows: ";
cin >> n;
for (int i = 1; i <= n; i++) {
for (int j = i; j < n; j++)
cout << " ";
for (int j = 1; j <= (2 * i - 1); j++)
cout << "*";
cout << endl;
}
for (int i = n - 1; i >= 1; i--) {
for (int j = n; j > i; j--)
cout << " ";
for (int j = 1; j <= (2 * i - 1); j++)
cout << "*";
cout << endl;
}
return 0;
}
🔹 Output
*
***
*****
*******
*****
***
*
6️⃣ Printing Pyramid Pattern in C++
📌 Print a pyramid of * symbols.
#include <iostream>
using namespace std;
int main() {
int n;
cout << "Enter the number of rows: ";
cin >> n;
for (int i = 1; i <= n; i++) {
for (int j = i; j < n; j++)
cout << " ";
for (int j = 1; j <= (2 * i - 1); j++)
cout << "*";
cout << endl;
}
return 0;
}
🔹 Output
*
***
*****
*******
7️⃣ Printing Tables using For Loop
📌 Print the multiplication table of a number.
#include <iostream>
using namespace std;
int main() {
int num;
cout << "Enter a number: ";
cin >> num;
for (int i = 1; i <= 10; i++) {
cout << num << " x " << i << " = " << num * i << endl;
}
return 0;
}
🔹 Output
Enter a number: 5
5 x 1 = 5
5 x 2 = 10
5 x 3 = 15
...
5 x 10 = 50
📌 Summary
✔ The for loop is best used when the number of iterations is known.
✔ It is useful for mathematical calculations, patterns, and loops over arrays.
✔ The loop variable updates in each iteration automatically.
Let me know if you need more examples or explanations! 🚀🔥
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