When 630 reversed 36 is printed. Why 0 is not shown?

Question

Below program takes an integer value and returns the number with its digits reversed. Works okay for numbers like 6540063 or 675 or 9600012 but does not output correct for 630 ,50 or 10 for numbers which end with 0. 630 returns 36. I don't understand why. Can you suggest what should I add? This looks like a spaghetti code isn't it?

#include <stdio.h>
#include <math.h>

void getDigit(int number);
void getReverse(int number);

int main(void) {

int namba=630;    //Enter here number to be reversed

getReverse(namba);

return 0;
}

void getDigit(int number) {

int div=1,reverse=0,count=0,i=0;

//to find max dividend
while (number>10*div){
    div*=10;  
    ++count;                                        
}       

while(div!=0&&i<=count){

    printf("%d ",number/div);
    number=number%div;
    div/=10;

}

}

void getReverse(int number){

int div=1,reverse=0,count=0,i=0;
    //to find max dividend
while (number>10*div){
    div*=10;  
    ++count;                                        
}       

while(div!=0&&i<=count){

    reverse+=(number/div)*pow(10,i++);      //to find reverse digits  
    number=number%div;
    div/=10;

}

printf("Reverse is: %d\n",reverse);

getDigit(reverse);

}

http://stackoverflow.com/questions/5007487/c-printf-with-leading-zeros — Brandon Moretz, Apr 15 '13 at 22:03

score 7 · Answer 1 · answered Apr 15 '13 at 22:02

7

Because you're losing the leading zero.

036 = 36

answered Apr 15 '13 at 22:02

Sten Petrov

10,943
1
41
61

I know I lose but what needs to be done to not lose it? IS there a way? – Lyrk Apr 15 '13 at 22:06
get the count of your number's digits, use that as a parameter to the code linked in a comment above – Sten Petrov Apr 15 '13 at 22:08
036 = 36, but '036' <> '36'. If you want a leading zero, you're looking at a string, not a number. – thursdaysgeek Apr 15 '13 at 22:48

score 2 · Accepted Answer · answered Apr 15 '13 at 22:08

2

void getReverse(int number){
    ...
    printf("Reverse is: %0*d\n",count + 1,reverse);
    ...
}

answered Apr 15 '13 at 22:08

Valeri Atamaniouk

5,125
2
16
18

When 630 reversed 36 is printed. Why 0 is not shown?

2 Answers2