C++ 12: Nested Loops

A loop within another loop is called a nested loop. Let's take an example,

Suppose we want to loop through each day of a week for 3 weeks.

To achieve this, we can create a loop to iterate three times (3 weeks). And inside the loop, we can create another loop to iterate 7 times (7 days). This is how we can use nested loops.

 

WAP a program to print following output:

12345

12345

12345

12345

#include <iostream>
using namespace std;
main()
{
    #include <iostream>
using namespace std;
main()
{
    for (int j = 1; j <= 4; j++)
    {
        for (int i = 1; i <= 5; i++)
        {
            cout << i;
        }
        cout << endl;
    }
}

12345
12345
12345
12345

2. WAP to print following output 

#include <iostream>
using namespace std;
main()
{
    #include <iostream>
using namespace std;
main()
{
   for (int n = 1; n <= 5; n++)
    {
        for (int m = 1; m <= n; m++)
        {
            cout << m;
        }
        cout << endl;
    }
}

Output:

1
12
123
1234
12345