By | 26.03.2017

# C Program to Print pyramid of numbers

Write a C Program to Print pyramid of numbers. Here’s simple Program to Print pyramid of numbers using Recursion in C Programming Language.

## Recursion : :

• Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is called a recursive call of the function.
• The C programming language supports recursion, i.e., a function to call itself. But while using recursion, programmers need to be careful to define an exit condition from the function, otherwise it will go into an infinite loop.
• Recursive functions are very useful to solve many mathematical problems, such as calculating the factorial of a number, generating Fibonacci series, etc.

Below is the source code for C Program to Print pyramid of numbers using Recursion which is successfully compiled and run on Windows System to produce desired output as shown below :

### SOURCE CODE : :

```/* C Program to Print pyramid of numbers */

#include<stdio.h>
void func1(int n);
void func2(int n);
void func3(int n);

int main( )
{

int n;
printf("Enter how many lines u want to print ? ");
scanf("%d",&n);
printf("\n------------ Pattern 1 ----------- \n\n");
func1(n);
printf("\n");
printf("\n------------ Pattern 2 ----------- \n\n");
func2(n);
printf("\n");
printf("\n------------ Pattern 3 ----------- \n\n");
func3(n);

return 0;

}

void func1(int n)
{
int i;
if(n==0)
return;
else
{
func1(n-1);
for(i=1; i<= n; i++)
printf("%d ",i);
printf("\n");
}
}

void func2(int n)
{
int i;
if(n==0)
return;
else
{
for(i=1; i<=n; i++)
printf("%d ",i);
printf("\n");
func2(n-1);
}
}

void func3(int n)
{
int i;
if(n==0)
return;
else
{
for(i=n; i>=1; i--)
printf("%d ",i);
printf("\n");
func3(n-1);
}
}```

### OUTPUT  : :

```Enter how many lines u want to print ? 10

------------ Pattern 1 -----------

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 10

------------ Pattern 2 -----------

1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7
1 2 3 4 5 6
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1

------------ Pattern 3 -----------

10 9 8 7 6 5 4 3 2 1
9 8 7 6 5 4 3 2 1
8 7 6 5 4 3 2 1
7 6 5 4 3 2 1
6 5 4 3 2 1
5 4 3 2 1
4 3 2 1
3 2 1
2 1
1```

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