C program to print the number pattern. 
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5

C Programming Language Loop control in C Language (Article) Loop control in C Language (Program)

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Program:

#include <stdio.h>
int main()
{
    int i=1,j;
    while (i <= 5)
    {
        j=1;
        while (j <= i )
        {
            printf("%d ",j);
            j++;
        }
        printf("\n");
        i++;
    }
    return 0;
}

Output:

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
Press any key to continue . . .

Explanation:

In this program, nested while loop is used to print the pattern. The outermost loop runs 5 times and for every loop, the innermost loop runs i times which is 1 at first, meaning only "1" is printed, then on the next loop it's 2 numbers printing "1 2" and so on till 5 iterations of the loop executes, printing "1 2 3 4 5". This way, the given number pattern is printed.

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