NESTED FOR LOOP IN C

When one or more loops define inside the boundary of other loops then it's known as nested loop.

A Simple Example of Nested Loop

for(i=0; i<4; i++)         // Outer loop

{

for(j=0; j<6; j++)                     // inner loop

{

}           // close inner loop

}           //  close outer loop

1 1 2 1 2 3 1 2 3 4 1 2 3 4 5

1 2 3 4 5 1 2 3 4 1 2 3 1 2 1

A A B A B C A B C D A B C D E

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

1 2 2 3 3 3 4 4 4 4 5 5 5 5 5

#include<stdio.h>

#include<conio.h>

Void main()

{                                                                                              

clrscr();

int i,k;

for(i=0; i<5; i++)

{

printf(”\n”);

for(k=1; k<=5-i; k++)            

{

printf(“%d”,k);

}

}

getch();

}

---Output---

1 2 3 4 5

1 2 3 4

1 2 3

1 2

1

#include<stdio.h>

#include<conio.h>

Void main()

{

clrscr();

int i,k;

for(i=1; i<=5; i++)

{

printf(”\n”);

for(k=1; k<=i; k++)

{

printf(“*”);

}

}

getch();

}

---OUTPUT---
*

* *

* * *

* * * *

* * * * *

#include<stdio.h>

#include<conio.h>

void main()

{

clrscr();

int i, j, k, s=3;

for(i=1; i<=7; i=i+2)

{

for(k=s; k>0; k--)

{

printf(“ “ );

}

for(j=1; j<=i; j++)

{

printf(“*”);

}

printf(“\n”);

s=s-1;

}

getch();

}

---OUTPUT---

*

* * *

* * * * *

* * * * * * *

INFINITE LOOP