Nested loop in C programming

The loop inside another loop is called a nested loop. It is a sequence of loop statements used together. The loop statement which is used outside of another is called the outer loop and the loop statement which is used inside of another is called the inner loop statement.

The guidelines for nested loops are:

• An inner loop and outer loop cannot have the same variable.
• The inner loop must be nested inside the outer loop.
• The inner loop must be terminating before the outer loop.
• The outer loop should be opened first but should be closed last.
• Loops must never cross each other.

Nested for loop

Syntax: for (initialization; condition; increment/decrement) {     statement(s);     for (initialization; condition; increment/decrement)     {         statement(s);         ... ... ...     }     ... ... ... }

 

Example: WAP to display the following numeric pattern 1 12 123 1234 12345

#include <stdio.h> #include <conio.h> main() { int x,y; for (x=1;x<=5;x++) { for (y=1;y<=x;y++) { printf("%d",y); } printf("\n"); } getch(); }

 

Nested while and do while loop

While nested loop	Do.. while nested loop
Syntax: while (condition1) {     statement(s);     while (condition2)     {         statement(s);         ... ....... ...     }     ... ... ... }	Syntax:   do {     statement(s);     do     {         statement(s);         ... ... ...     }while (condition2);     ... ... ... }while (condition1);
Example: #include<stdio.h> #include<conio.h> main() { int a=1; while (a<=5) { int b=1; while(b<=a) { printf("%d",b); b++; } printf("\n"); a++; } getch(); } Output: 1 12 123 1234 12345	Example:   #include<stdio.h> #include<conio.h> { int a=1; do { int b=1; do { printf("%d",b); b++; }while (b<=a); a++; printf("\n"); }while(a<=5); getch(); } Output: 1 12 123 1234 12345

 

Some solved nested loop programs

1.       WAP to display the following numeric pattern.             12345             1234             123             12             1 Ans: #include<stdio.h> #include<conio.h> main() { int a=5;   while (a>=1) { int b=1; while(b<=a) { printf("%d",b); b++; } printf("\n"); a--; } getch(); }	2.  Write a program to generate the following: 1 22 333 4444 55555   Ans: #include<stdio.h> #include<conio.h> main() { int i,j; for(i=1;i<=5;++i) { for(j=1;j<=i;++j) { printf("%d",i); } printf("\n"); } getch(); }
3.  WAP to display the following: 55555 4444 333 22 1   Ans: #include<stdio.h> #include<conio.h> main() { int i,j; for(i=5;i>=1;--i) { for(j=1;j<=i;++j) { printf("%d",i); } printf("\n"); } getch(); }	4.         WAP to display the following table: 10        20        30        40        50 20        30        40        50        60 30        40        50        60        70 40        50        60        70        80 50        60        70        80        90 60        70        80        90        100   Ans: #include<conio.h> #include<stdio.h> main() { int x,y; for (x=0;x<=5;x++) { for (y=1;y<=5;y++) { printf("%d\t",(x+y)*10); } printf("\n"); } getch(); }
5. WAP  to print multiplication table of first 10 natural numbers. Ans: #include<stdio.h> #include<conio.h> main() { int i,j,c; for(i=1;i<=10;++i) {          for(j=1;j<=10;++j) { c=i*j; printf("%dX%d=%d\t",i,j,c); } printf("\n"); } getch(); }	6. WAP  to display the factorial number of the first 10 natural numbers. Ans: #include<stdio.h> #include<conio.h> main() { int i,j,f; for(i=1;i<=10;++i) {   f=1;   for(j=i;j>0;--j)   {    f=f*j;   }   printf("%d=%d\n",i,f);   }   getch(); }
7. Write a program to prime numbers up to 500 numbers. Ans: #include<stdio.h> #include<conio.h> main() { int i,j; for(i=2;i<=100;++i) { for(j=2;j<=i;++j) {    if(i%j==0)    break; }  if(i==j)  printf("%d\t",i); }  getch(); }	8. Write a program to display the following pattern * ** *** **** ***** Ans: #include <stdio.h> #include<conio.h> main() {     int x=1,y;     do     {         y=1;         do         {             printf("*");             y++;         }while(y <= x);         x++;         printf("\n");     }while(x <= 5);     getch(); }

 

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