C++ Nested for Loop
A nested for loop is basically putting one loop inside another loop. Every time the outer loop runs, the inner loop runs all the way through. It’s a way to repeat tasks within tasks in your program.
Example of Nested for Loop
The below example demonstrates the use of Nested for loop in a C++ program.
C++
// C++ program to demonstrate the use of Nested for loop. #include <iostream> using namespace std; int main() { // Outer loop for (int i = 0; i < 4; i++) { // Inner loop for (int j = 0; j < 4; j++) { // Printing the value of i and j cout << "*" << " "; } cout << endl; } } |
* * * * * * * * * * * * * * * *
Explanation
The above program uses nested for loops to print a 4×4 matrix of asterisks (*). Here, the outer loop (i) iterates over rows and the inner loop (j) iterates over columns. In each iteration, inner loop prints an asterisk and a space also new line is added after each row is printed.
for Loop in C++
In C++, for loop is an entry-controlled loop that is used to execute a block of code repeatedly for the specified range of values. Basically, for loop allows you to repeat a set of instructions for a specific number of iterations.
for loop is generally preferred over while and do-while loops in case the number of iterations is known beforehand.