Triangle number pattern using 0,1 in C - 4

1
11
101
1001
11111

Required knowledge

Logic to print the given number pattern

1
11
101
1001
11111

1. The pattern consists of N rows (where N is the number of rows to be printed). Outer loop formation to iterate through the rows will be for(i=1; i<=N; i++).
2. Each row contains exactly i columns (where i is the current row number). Hence the loop formation to iterate though individual columns will be for(j=1; j<=i; j++).
3. Now comes the logic to print 0 or 1. You can see that 1 only gets printed for first and last column or first and last row otherwise 0 gets printed. Therefore you must check a condition that if(i==1 || i==N || j==1 || j==i) then print 1 otherwise print 0.

Program to print the given number pattern

/**
 * C program to print triangle 0, 1 number pattern
 */

#include <stdio.h>

int main()
{
    int i, j, N;

    printf("Enter N: ");
    scanf("%d", &N);

    for(i=1; i<=N; i++)
    {
        for(j=1; j<=i; j++)
        {
            if(i==1 || i==N || j==1 || j==i)
            {
                printf("1");
            }
            else
            {
                printf("0");
            }
        }

        printf("\n");
    }

    return 0;
}

Screenshot