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C program to print Floyd's triangle

Here, we are going to learn how to print Floyd's triangle using C program? Submitted by Nidhi, on August 01, 2021

Problem statement

Read the total number of rows from the user, and then print Floyd's triangle.

What is Floyd's triangle?

Floyd's triangle is a triangular array of natural numbers. In this triangle, the rows of the triangle are filled with consecutive natural numbers, starting with a 1 in the top left corner.

Example

C program to print Floyd's triangle

The source code to print Floyd's triangle is given below. The given program is compiled and executed using GCC compile on UBUNTU 18.04 OS successfully.

// C program to print Floyd's triangle

#include <stdio.h>

int main()
{
    int outer = 0;
    int inner = 0;
    int number = 1;
    int rows = 0;

    printf("Enter the total number of rows: ");
    scanf("%d", &rows);

    for (outer = 0; outer <= rows; outer = outer + 1) {
        for (inner = 1; inner < outer + 1; inner++) {
            printf("%d ", number);
            number = number + 1;
        }
        printf("\n");
    }

    return 0;
}

Output

RUN 1:
Enter the total number of rows: 4

1 
2 3 
4 5 6 
7 8 9 10 

RUN2:
Enter the total number of rows: 10

1 
2 3 
4 5 6 
7 8 9 10 
11 12 13 14 15 
16 17 18 19 20 21 
22 23 24 25 26 27 28 
29 30 31 32 33 34 35 36 
37 38 39 40 41 42 43 44 45 
46 47 48 49 50 51 52 53 54 55 

RUN 3:
Enter the total number of rows: 15

1 
2 3 
4 5 6 
7 8 9 10 
11 12 13 14 15 
16 17 18 19 20 21 
22 23 24 25 26 27 28 
29 30 31 32 33 34 35 36 
37 38 39 40 41 42 43 44 45 
46 47 48 49 50 51 52 53 54 55 
56 57 58 59 60 61 62 63 64 65 66 
67 68 69 70 71 72 73 74 75 76 77 78 
79 80 81 82 83 84 85 86 87 88 89 90 91 
92 93 94 95 96 97 98 99 100 101 102 103 104 105 
106 107 108 109 110 111 112 113 114 115 116 117 118 119 120

Explanation

Here, we read the total number of rows from the user and then printed Floyd's triangle using the nested loop on the console screen.

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