C++ Code Example: Floyd’s Triangle

This code prints the Floyd’s Triangle, a right-angled triangle that is named after Robert Floyd. Each row of the triangle contains numbers starting from 1 and increasing by 1 for each new row.

Code Example

#include <iostream>
using namespace std;

int main() {
    int i, j, n, k = 1;

    cout << "Enter number of rows of floyd`s trangle: ";
    cin >> n;
    
    for (i = 1; i <= n; i++) {
        for (j = 1; j <= i; j++) {
            cout << k << " ";
            k++;
        }
        cout << endl;
    }

    return 0;
}

Output

Enter number of rows of floyd`s trangle: 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

Code Explanation

Here is how it works:

• It prompts the user to enter the number of rows of the Floyd’s Triangle and reads the input using the cin statement.
• It initializes i, j, and k variables to 1.
• The outer loop for (i = 1; i <= n; i++) is responsible for iterating over the number of rows specified by the user.
• The inner loop for (j = 1; j <= i; j++) is responsible for printing the numbers of each row in the Floyd’s Triangle. It prints the number stored in the k variable and then increments k.
• After printing all numbers of a row, it prints a newline character to start a new line for the next row.
• Once all rows have been printed, the program terminates.