C program to print triangle pattern having same number in a row

• Write a program in C to print right triangle having same number in a row.

For a right triangle of 6 rows, program’s output should be:

Required Knowledge

• For Loop
• printf and scanf function in C

Algorithm to print triangle pattern having same number in a row using for loop

• Take the number of rows(N) of right triangle as input from user using scanf function.
• Number of integers in K^th row is always K.
• We will use two for loops to print right triangle of natural numbers.
  • Outer for loop will iterate N time. Each iteration of outer loop will print one row of the pattern.
  • For K^th row, Inner loop will iterate K times. Each iteration of inner loop will print row number on screen.

Here is the matrix representation of the above mentioned pattern. The row numbers are represented by i whereas column numbers are represented by j.

C program to print right triangle pattern having same number in a row

#include<stdio.h>
 
int main() {
    int i, j, rows;
 
    printf("Enter the number of rows\n");
    scanf("%d", &rows);
 
    for (i = 0; i < rows; i++) {
        for (j = 0; j <= i; j++) {
            printf("%d ", i+1);
        }
        printf("\n");
    }
    return(0);
}

Output

Enter the number of rows
6
1
2 2
3 3 3
4 4 4 4
5 5 5 5 5
6 6 6 6 6 6