Nested Loop with example C Language

> gcc -Wall -Wextra -O2 program.c -o program
> ./program
> ```


---

When loop inside a loop is called nested loop. Working procedure of nested loop is that the first pass of the outer loop triggers the inner loop, which executes to completion. Then the second pass of the outer loop triggers the inner loop again. This repeats until the outer loop finishes.

## Syntax of nested loop (for, while and do-while):

**The syntax of a nested for loop: is as follows :**

**The syntax of a nested while loop  is as follows :**

The syntax of a **nested do-while loop**  is as follows :

## 

#

# Nested Loop Example Program:

 	
- **C Program to print various pattern using * and space and number:**

Here we describe how to create various patterns using c programming. Most of these c programs involve usage of nested loops number, star (*) and space. A pattern of numbers, star or characters is a way of arranging these in some logical manner or they may form a sequence. Some of these patterns are triangles which have special importance in mathematics. Some patterns are symmetrical while other are not. Please see the complete page and look at comments for many different patterns.

## Print Pattern Program #1

#include<stdio.h>
void main()
{
   int i,j,term;
   clrscr();
   printf("Enter the number of row you want to see");
   scanf("%d",&term);
   for (i = 1 ; i <= term ; i++)
   {
       for(j = 1 ; j <= i ; j++)
       {
           printf("%d",i);
       }
       printf("\n");
   }
   getch();
  
   
}

1
 12
 123
 1234
 12345

**Output #2:**

[![Pattern2](http://technhit.in/wp-content/uploads/2016/08/nested-pattern2.png)](http://technhit.in/wp-content/uploads/2016/08/nested-pattern2.png)

## Print Pattern Program #3

#include<stdio.h>
void main()
{
   int i,j,term;
   clrscr();
   printf("Enter the number of row you want to see");
   scanf("%d",&term);
   for (i = term ; i >= 1 ; i--)
   {
       for(j = 1 ; j <= i ; j++)
       {
           printf("%d",j);
       }
       printf("\n");
   }
   getch();
  
   
}

55555
4444
333
22
1

**Output #4:**

[![Pattern4](http://technhit.in/wp-content/uploads/2016/08/nested-pattern4.png)](http://technhit.in/wp-content/uploads/2016/08/nested-pattern4.png)

## Print Pattern Program #5

#include<stdio.h>
 
void main()
{
      int n, j, i, num = 1, space;
      clrscr();

      printf("Enter the number of rows in pyramid of stars you want to see ");
 
      scanf("%d",&n);
 
      space = n - 1;
 
      for ( i = 1 ; i <= n ; i++ )
      {
          num = i;
 
          for ( j = 1 ; j <= space ; j++ )
              printf(" ");
 
          space--;
 
          for ( j = 1 ; j <= i ; j++ )
          {
              printf("%d", num);
              num++;
          }
          num--;
          num--;
          for ( j = 1 ; j < i ; j++)
          {
              printf("%d", num);
              num--;
          }
          printf("\n");
 
      }
      getch();
      
}

* * * * *
  * * * *
    * * *
      * *
        *

**Output #6:**

[![pattern6](http://technhit.in/wp-content/uploads/2016/08/nested-pattern6.png)](http://technhit.in/wp-content/uploads/2016/08/nested-pattern6.png)

## Print Pattern Program #7

#include <stdio.h>
void main() {
 int n,i,j;
 clrscr();
 printf("Enter the number of rows in pyramid of stars you want to see ");
 scanf("%d",&n);
 for (i=n; i>=1; i--) 
 {
    for (j=1; j<=i; j++) 
    {
        printf(" * ");
    }
    printf("\n");
 }
 getch();
}

*
   ***
  *****
 *******
*********

** Output #8:**

[![Pattern8](http://technhit.in/wp-content/uploads/2016/08/nested-pattern8.png)](http://technhit.in/wp-content/uploads/2016/08/nested-pattern8.png)

## Print Pattern Program #9

#include <stdio.h>
#include <conio.h>
void main() {
 int n,i,j,k,samp=1;
  clrscr();
  printf("Enter the number of rows in pyramid of stars you want to see ");
  scanf("%d",&n);
 for (i=1; i<=n; i++) 
 {
     for (k=samp; k<=n; k++) 
     {
          printf(" ");
     }
     for (j=0; j< i; j++) 
     {
          printf("*");
     }
     samp = samp + 1;
     printf("\n");
 }
 samp = 1;
 for (i=n-1; i>=1; i--) 
 {
     for (k=samp; k>=0; k--) 
     {
         printf(" ");
     }
     for (j=i; j>=1; j--)
     {
         printf("*");
     }
     samp = samp + 1;
     printf("\n");
 }
 getch();
}

#include <stdio.h>
#include <conio.h>
#include<dos.h>
void main()
{
int row,c,tmp,color=1;
 while(!kbhit())                 //kbhit() returns true if anybody press any key from keyboard.
 { 
    clrscr();
    if (color==7)
    color=1;
    textcolor(color);              // set corsor color
    tmp=5;
    for ( row = 1 ; row <= 5 ; row++ )
    {
        for ( c = 1 ; c <tmp ; c++ )
            cprintf(" ");
            tmp--;

        for ( c = 1 ; c <= 2*row - 1 ; c++ )
            cprintf("*");

            printf("\n");
    }
    delay(200);
    clrscr();
    textcolor(color);
    tmp=1;
    for ( row = 5 ; row >= 1 ; row-- )
    {
        for ( c = 1 ; c < tmp ; c++ )
             cprintf(" ");
             tmp++;

        for ( c = 1 ; c <= 2*row - 1 ; c++ )
             cprintf("*");

             printf("\n");
    }
    delay(200);
    color++;
 }
 getch();
}

/* C Program to Print Inverted Right Triangle Star Pattern */
#include <stdio.h>
 
int main() 
{
  int Rows, i, j;
	
  printf("Please Enter the Number of Rows:  ");
  scanf("%d", &Rows);
	
  printf("\nPrinting Inverted Right Angled Triangle \n \n");
  for ( i = Rows ; i > 0 ; i-- ) 
  {
      for ( j = i ; j > 0 ; j-- ) 
      {
          printf("* ");
      }
      printf("\n");
  }
  return 0;
}

* * * * * * *
 * * * * * *
 * * * * *
 * * * *
 * *
 *