Code 1:

1.

**Write a c program to reverse a given number**
2.

**C program to find reverse of a number**
3.

4.**C program to reverse the digits of a number****R**

**everse of a number in c using while loop**

#include<stdio.h>

int main(){

int num,r,reverse=0;

printf("Enter any number: ");

scanf("%d",&num);

while(num){

r=num%10;

reverse=reverse*10+r;

num=num/10;

}

printf("Reversed of number: %d",reverse);

return 0;

}

Sample output:

Enter any number: 12

Reversed of number: 21

Code 2:

**1. Reverse very large or big numbers beyond the range of long int**

**2. Reverse five digit number c program**

Logic is we accept the number as string

#include<stdio.h>

#define MAX 1000

int main(){

char num[MAX];

int i=0,j,flag=0;

printf("Enter any positive integer: ");

scanf("%s",num);

while(num[i]){

if(num[i] < 48 || num[i] > 57){

printf("Invalid integer number");

return 0;

}

i++;

}

printf("Reverse: ");

for(j=i-1;j>=0;j--)

if(flag==0 && num[j] ==48){

}

else{

printf("%c",num[j]);

flag =1;

}

return 0;

Sample output:

Enter any positive integer: 234561000045645679001237800000000000

Reverse: 8732100976546540000165432

Code 3:

**1. C program to reverse a number using for loop**

**2. How to find reverse of a number in c**

**3. Wap to reverse a number in c**

#include<stdio.h>

int main(){

int num,r,reverse=0;

printf("Enter any number: ");

scanf("%d",&num);

for(;num!=0;num=num/10){

r=num%10;

reverse=reverse*10+r;

}

printf("Reversed of number: %d",reverse);

return 0;

}

Sample output:

Enter any number: 123

Reversed of number: 321

Code 4:

1.

**C program to reverse a number using recursion**
#include<stdio.h>

int main(){

int num,reverse;

printf("Enter any number: ");

scanf("%d",&num);

reverse=rev(num);

printf("Reverse of number: %d",reverse);

return 0;

}

int rev(int num){

static sum,r;

if(num){

r=num%10;

sum=sum*10+r;

rev(num/10);

}

else

return 0;

return sum;

}

Sample output:

Enter any number: 456

Reverse of number: 654

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## 57 comments:

better.........

its helping me a lost

u can avoid recursion by directly writing this code

while(num!=0)

{

r=num%10;

sum=sum *10 + r

num=num/10;

}

take num=12

now r=12%10=2

sum=0*10+2=2

num=12/10=1

now num becomes 1

r=1%10=1

sum=2*10+1=21

num=1/10=0 so now 0>0 does not satisfy

printf("%d",sum)

so reverse of 12 is 21

@raj this logic only possible for upto 9nums

/*i think i hv a b8r code.....*/

#include

main()

{

int a,b,c,d,e;

printf("Enter the Number to Find it's Reverse\n");

scanf("%d",&a);

while(a!=0)

{

b=a%10;

c=a/10;

printf("%d",b);

a=c;

}

}

kapil's prog is great and easy

it is good but not perfect

yours s good but

in some case ther will some need to hav zero in 1st digit

like 1230 we need to get 0321

yours cant do that,..???

Hi sangeerth,

In code 2 instead of

for(j=i-1;j>=0;j--)

if(flag==0 && num[j] ==48){

}

else{

printf("%c",num[j]);

flag =1;

}

Write only

for(j=i-1;j>=0;j--)

printf("%c",num[j]);

These programs to reverse a number are not workin in the case of numbers which ends with zeor . Please help. for example if we input 320 the reverse shows 23 only not zero at the beginning.

@alida: because the reverse of 320 is 023 and the zero at the front of a whole number is ignored because it is not significant.

@alida: because the reverse of 320 is 023 and the zero at the front of a whole number is ignored because it is not significant.

wow wonderful..............dennis ritche is very happy in heaven

/*U can write a 'c' program to search details of a person (simple program)*/

#include

#include

#include

void main()

char n;

int p==2429;

printf("Enter a name);

scanf("%s",n);

printf("Password please");

if(n==khirod&&p==2429)

{

printf("details of khirod");

}

if(n==giri&&p==2429)

{

printf("details of giri");

}

{

.

.

.

.

.

}

getch();

}

hay frnz any body tell me which one video tutorial cd(disk) is best . where i will purchase it

write a C program to calculate area and perimeter of circle according to user choice by using switch statement.

give me the answer as soon as possible

thank you

These links may help you:

C PROGRAM TO CALCULATE AREA OF A CIRCLE

Write a c program to find the perimeter of a circle

: Write a program that prints the following pattern.

*

* *

* * *

* * * *

* * * * *

* * * * * *

i am needs this programme.i hope you will help me......

Write a program which adds two arrays with the help of their pointers.

Using your method if u will calculate the reverse of 10 or 100 or 1000 and so on ...then it will return 1 and 1 and 1 respectively so on .it can not show 01 , 001 , 0001 as reverse.

thanks but can you logics for using this code i.e:

r=no%10;

no=no/10;

rno=rno*10+r;

if(num[i] < 48 || num[i] > 57)......

plz explain this condition ......

some programs have errors

#include

int main()

{

int row,i,j;

printf("Enter the row:");

scanf("%d",&row);

for(i=1;i<=row;i++){

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

printf("*");

}

printf("\n");

}

getch();

return 0;

}

Program to reverse a very large number.

#include

#include

main()

{

char str[100];

int i, j;

scanf("%s",str);

for(i = strlen(str)-1; i >= 0; i--)

printf("%c",str[i]);

}

num[i] will return ASCII value of that character. ASCII value of '0' is 48 and '9' is 57.

devlop an algorithm to find reverse of the given number.

why the 1 code is not reversing the number 12345 to 54321...??????????

it should revrse all the numbers less than 32767 which is int max value..

this program won't work for 000002 as it's reverse shall be 200000 but the answer comes out to be 2.... please someone help me with this....

your program is so easy to understand. thanks kapil bhai

why need of flag?? and why to take char ??cant we do it for large numbers..widout char??

*

***

*****

*******

*********

pls giv me the code for thiz...

void main()

{

int r,c;

for(r=0;r<5;r++)//for row

{

for(c=0;c<=r*2;c++)

{

printf("*");

}

printf("\n");

}

}

very good

Zero at the beginning of a number has no value anyways.

#include

#include

void main()

{

int i;

for(i=10;i>=1;i--)

{

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

}

getch();

}

put............... #include

#include

super kapil urs program was G.R.E.A.T

#include

main()

{

int a,b,c,d,e;

printf("Enter the Number to Find it's Reverse\n");

scanf("%d",&a);

while(a!=0)

{

b=a%10;

c=a/10;

printf("%d",b);

a=c;

}

}

this prog print 000002 as output while 200000 as input and this was also explained by Kapil

import java.util.Scanner;

public class Reverse

{

public static void main(String args[])

{

int a,b,c,d=0;

System.out.println("Enter the number");

Scanner sc=new Scanner(System.in);

a=sc.nextInt();

while(a!=0)

{

b=a%10;

c=a/10;

d=d*10+b;

a=c;

}

System.out.println(d);

}

}

awesome site...:)

it really helping me alot....and yes,i want such good sites for java programs...plzz guys help me...

Why we use n% 10 why not n% 100 in reverse of a number

Hello frnds I need a code....Count the number of words in a line using array...For exm..Word=space+1;

No need of variable c, you can write a = a/10;

how can i print 0 in the beginning and t the last because this program does not post value 0

hii priyanka

can u plz tell me how to print reverse num of this value (1000 or 0001)

Good idea using while loop

/* This is the program to reverse the input number without using any looping or functioning and recursive Technique*/

#include

main()

{

int a,a1,a2,a3;

int b=0,b1,b2,b3,b4;

int no;

int new1,new2,new3,new4;

printf("Enter a Five Digit No: "); //U have to ennter a five digit Number

scanf("%d",&no); //entered number will be saved at the location of variable no

//For example the entered number is 12345

a=no%10; //here after this modulo operation a=5

b=b*10+a; // After this arithmetic operation b=5

new1=no/10; // after this new1=1234

a1=new1%10; // a1=4

b1=b*10+a1; // b1=5*10+4=54

new2=new1/10; //new2=123

a2=new2%10; //a2=3

b2=b1*10+a2; //b2=54*10+3=543

new3=new2/10; // new3=12

a3=new3%10; //a3=2

b3=b2*10+a3; //b3=543*10+2=5432

new4=new3/10; //new4=1

b4=b3*10+new4; //b4=5432*10+1=54321

printf("The Reverse of the entered no is : %d",b4);

//SO the number is reversed here finally

}

Void main()

{

int i,j,n=5;

For(j=1;j<=n;j++)

{

For(i=1;i<=2*j-1;i++);

{

Printf("*");

}

Printf("\n");

}

}

Void main()

{

int i,j,n=5;

For(j=1;j<=n;j++)

{

For(i=1;i<=2*j-1;i++);

{

Printf("*");

}

Printf("\n");

}

}

#include

#include

Void main()

{

int number,rev_num,remainder;

Clrscr();

rev_num=0;

printf("Enter number:");

scanf("%d",& number);

While(number>0)

{

remainder=number%10;

rev_num=rev_num*10+remainder;

number=number/10;

}

Printf("the reversed number is %d",rev_num);

getch();

}

I cant reverse a five digit number by this prgrm..pls anyone let me know what is the problm with this prgrm...reply fast

#include

#include

Void main()

{

int number,rev_num,remainder;

Clrscr();

rev_num=0;

printf("Enter number:");

scanf("%d",& number);

While(number>0)

{

remainder=number%10;

rev_num=rev_num*10+remainder;

number=number/10;

}

Printf("the reversed number is %d",rev_num);

getch();

}

I cant reverse a five digit number by this prgrm..pls anyone let me know what is the problm with this prgrm...reply fast

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