## INDEX

### Reverse any number using c program

Code 1:
1. Write a c program to reverse a given number
2. C program to find reverse of a number
3. C program to reverse the digits of a number
4. Reverse 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

1. better.........

2. its helping me a lost

3. u can avoid recursion by directly writing this code

while(num!=0)
{
r=num%10;
sum=sum *10 + r
num=num/10;
}

4. 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

5. @raj this logic only possible for upto 9nums

6. /*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;
}
}

1. your program is so easy to understand. thanks kapil bhai

2. very good

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

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

7. kapil's prog is great and easy

8. it is good but not perfect

9. 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,..???

10. Hi sangeerth,
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]);

11. 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.

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

12. @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.

1. This comment has been removed by the author.

13. @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.

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

15. /*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);
if(n==khirod&&p==2429)
{
printf("details of khirod");
}
if(n==giri&&p==2429)
{
printf("details of giri");
}
{
.
.
.
.
.
}
getch();
}

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

17. 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

18. : Write a program that prints the following pattern.
*
* *
* * *
* * * *
* * * * *
* * * * * *

1. #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;
}

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

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

21. 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.

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

r=no%10;
no=no/10;
rno=rno*10+r;

23. if(num[i] < 48 || num[i] > 57)......
plz explain this condition ......

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

24. some programs have errors

25. 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]);
}

26. This comment has been removed by the author.

27. devlop an algorithm to find reverse of the given number.

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

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

30. 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....

1. #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

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

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

32. *
***
*****
*******
*********
pls giv me the code for thiz...

1. void main()
{
int r,c;
for(r=0;r<5;r++)//for row
{
for(c=0;c<=r*2;c++)
{
printf("*");
}
printf("\n");
}
}

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

33. #include
#include
void main()
{
int i;
for(i=10;i>=1;i--)
{
printf("%d\n",i);
}
getch();
}

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

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35. 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);
}

}

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

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

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

39. very helpful and useful post you have shared.

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