# How to Print Floyds Triangle in C

In this tutorial we will take a quick look at the Floyd’s triangle using the C language. The Floyd’s triangle (named after Robert Floyd) algorithm is a right-angled triangular array of natural numbers. It is defined by filling the rows of the triangle with consecutive numbers, starting with the number one in the top left corner.

This algorithm is often used in programming courses, so it make sense that we take a quick look at it.

Take a look at the following C language source code example of Floyd’s triangle:

```
#include <stdio.h>
int main() {
int rows, a, b, number = 1;
printf("Number of rows of Floyd's triangle to print:");
scanf("%d",&rows);
for ( a = 1 ; a <= rows ; a++ ) {
for ( b = 1 ; b <= a ; b++ ) {
printf("%d ", number);
number++;
}
printf("\n");
}
return 0;
}
```

We start by asking for the numbers of rows we want to print of the Floyd´s triangle. After we have entered a number we start the first for loop (we loop until we have the number of rows). The second for loop that is where we print the numbers, after the print we do number = number + 1. It prints numbers until we are equal to a of the first for loop. We then go to a newline.

Below you’ll find the output of the program, where we have asked to print 8 rows:

That’s all for this C language tutorial.

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thanks

thanks it is very helpful for me

Thanks.

thanks for give n descript…

thanx its very helpful to all.

thanks for your support but i would like you to show me the code to display rectangle by using text file.

thanks for introducing a concept which i didn’t know…:)

Thx

Thanks for the concept

please make many more of this type

what should i do to print this triangle when i m given the last number of last row instead of number of rows….can u help for this?