Program using While Loop

Unlike most of the computer programming languages, a while loop is a control flow statement that allows code to be executed repeatedly based on a given boolean condition in C or C++. The while loop can be thought of as a repeating if statement. Here is some program using while Loop:

• C Program to return reverse of a three digit number:

Assume that you have input a number 123 to computer and computer return it to 321. we know that if a number divided by 10 then its reminder is always the last digit of inputted number. (123%10 =3, 12%10=2)

#include<stdio.h>
void main()
{
int number,reverse=0,reminder;
clrscr();
printf("Enter any three digits value: ");
scanf("%d",&number);
while(number>0)
{
reminder=number%10;
reverse=(reverse*10)+reminder;
number=number/10;
}
printf("Reverse value is %d",reverse);

}

Output: • C Program to find Armstrong number between a range :

An Armstrong number is the  sum of the cubes of its digits and  is equal to the number itself. For example, 371 is an Armstrong number since 3**3 + 7**3 + 1**3 = 371.

#include<stdio.h>
void main()
{
int i=0,number, reminder, armstrong=0,term;
clrscr();
printf("Enter term to search Armstrong:");
scanf("%d", &term);
while(i<=term)
{
number=i;
while(number>0)
{
reminder=number%10;
armstrong =armstrong +(reminder*reminder*reminder);
number=number/10;
}
if(armstrong ==i)
printf("Armstrong No is %d",i)

i++;
}
}

Output: • C Program to check a given number whether palindrome or not.

A palindrome is a word, phrase, number, or other sequences of characters which read the same backwards or forward. Allowances may be made for adjustments to capital letters, punctuation, and word dividers. Examples in English include “A man, a plan, a canal, Panama!”, “Amor, Roma”, “race car”, “stack cats”, “step on no pets”, “taco cat”, “put it up”, “Was it a car or a cat I saw?” and “No ‘x’ in Nixon” ,”121″ etc.

In case of number we use reverse method:

#include<stdio.h>
void main()
{
int num,value,reminder,tmp;
printf("Enter any number to check palindrome");
scanf("%d",&num);
tmp=num;
while(tmp>0)
{
reminder=tmp%10;
value=value*10+reminder;
tmp=tmp/10;

}
if (num==value)
{
printf("Entered Number %d is a palidrome number",num);
}
else
{
printf("Entered Number %d is not apalindrome number",num);
}
}

In case of String we use string function substr()

#include<stdio.h>
#include<string.h>
void main()
{
char word,rev;
clrscr();
printf("Enter any word: ");
scanf("%s", &word);
strcpy(rev,word);
if (strcmp(word,strrev(rev))==0)
{
printf("The word is palindrome");
}
else
{
printf("The word is not a palindrome");
}
getch();

} The following two tabs change content below.

Subroto Mondal

Chief Coordinator HR&CR
I like Programming and New Technologies. And work with Linux.

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