Loops in c Language

Loops in C Language

Loops : The Computer lies in its ability to perform a set of instructions repeatedly. That Means Loop is Number of Times Repeat Until a Particular Condition is Satisfied. This Repetitive Operation is Done Through a Loop Control Statement. 

There are Three Methods. They are,

• Using a For Statement 
• Using a While Statement
• Using a do-While Statement

First we need to Understanding While Loop in C Program.

While Loop: In This Case programming that you want to do something a fixed number of times. The while loop mostly Cases use for calculate salary of different no.of persons. Convert to temperature from centigrade to Fahrenheit .

Sample Program For While Loop

#include<stdio.h>

int main()

{

int p,n,count;

float r,si;

count=1;

while (count<=3)

{

printf("Enter values p,n,r:\n");

scanf("%d%d%f",&p,&n,&r);

si=p*n*r/100;

printf("Interest = %f",si);

count=count+1;

}

}

For Loop:  The For Loop is Most Popular in looping instruction  c Programming Language . Why For Loop is Popular ? . For loop Having  Three stages Complete at a line.

General Form For Loop Syntax

for ( initial value; test value; increment value )

Sample Program

#include<stdio.h>

int main()

{

int a;

printf("Enter a Values:\n");

scanf("%d",&a);

for (a=a;a<=10;a++)

{

printf("Enter The Value is %d\n",a);

}

}

Nested Loops : The Nested Loop process With in while and for loops in c programming Language.

Sample Program For Nested Loop in For Loop !!

#include<stdio.h>

int main()

{

int r,c,sum;

for(r=1;r<=3;r++) //outer loop

{

for(c=1;c<=2;c++) // inner loop

{

sum=r+c;

printf("r=%d C=%d sum=%d \n",r,c,sum);

}

}

}

Odd Loop : The odd loop using for the far executed the statement with in ten a finite number of times.The odd loop function can be used in below program with do or while methods.

Program For Odd Loop

#include<stdio.h>

int main()

{

char another;

int x;

do{

printf("Enter a Number :");

scanf("%d",&x);

printf("Square of %d Value %d",x,x*x);

printf("\n we want to Enter the Another Number : y/n");

scanf("%c",&another);

}

while(another=='y');

}

Break Statement : The Break Statement is using in loop process jump the out of the loop.

For Example Break Statement in C

                                                                   // prime number Checking

#include<stdio.h>

int main()

{

int num,i;

printf("Enter number");

scanf("%d",&num);

i=2;  // initial value

while( i <=num-1)

{

if(num%i==0)

{

printf("This Number is not Prime ");

break;

}

i++;

}

if(i==num)

printf("prime number");

}

Continue Statement : The Continue Statement is some programming situations. we want to take the control to the beginning of the loop , by passing the statement inside the loop , which have not yet been executed. 

Using Keyword  " continue ".

Sample Programs for continue 

#include<stdio.h>

int main()

{

int i,j;

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

{

for(j=1;j<=2;j++)

{

if(i==j)

continue;

printf("\n %d %d\n",i,j);

}

}

}

do-While Loop : The  do-while loop like to be while process.( minor difference ) .The While tests the condition before executing any of the statements with in the while loop. as against this , the do-while tests the condition after having executed the statements with in the loop.

Small Program Example For Do-While Loop

While 

#include<stdio.h>

int main()

{

while(4<1)

printf("Welcome");

}

Do -while

#include<stdio.h>

int main()

{

do{

printf("welcome\n");

}

while(4<1);

}

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