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Reverse a number using C programme


Posted Date:     Category: Computer & Technology    
Author: Member Level: Gold    Points: 1


 

#include
main()
{
int num;
void reverse(int num);//The function for reversing is decleared.
clrscr();
printf("enter number");
scanf("%d",&num);
reverse(num);//The function is called.
getch();
}

void reverse(int num)
{
int temp=0;
int rev=0;
temp=num;//The number is stored in to another variable.
while(temp!=0)//We are using that dupicate.
{
rev=rev*10+temp%10;//By using temp%10, we will get the last digit of the number.
temp/=10;//Then the number is get reduced by one.
}
printf("%d",rev);\\After the end of loop reverse of number will stored in rev.
}


Example

consider n=123
we are assigned that number in to 'temp'.
in the loop the condition is "temp!=0".
now temp=123.
the step temp%10 means take it's reminder it will be 3.
we decleared rev=0.
so 'rev=rev*10+temp%10' means 3. [rev*10=0].
Now rev=3.
the next step is temp/10. Now temp=12.
The codition of the loop is true so it will cotinue.
Now temp%10 = 2.
so 'rev=rev*10+temp%10' means 32. [rev*10=30].
It will continue.





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Responses to "Reverse a number using C programme"
Author: Raghav    21 Aug 2008Member Level: Gold   Points : 1
Shoba,
you could have given some explanation of what each part of the code does. That is the normal practice so that everyone who reads the code will understand it easily. Kindly give a brief description of the code and what each function does.

Raghav


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