C Exercises: Reverse the digits of a given integer
C Programming Mathematics: Exercise-1 with Solution
Write a C program to reverse the digits of a given integer.
Example:
Input:
i = 123
i = 208478933
i = -73634
Output:
Reverse integer: 321
Reverse integer: 339874802
Reverse integer: -43637
Pictorial Presentation:
Sample Solution:
C Code:
#include <stdio.h>
int reverse(int n) {
int d, y = 0;
while (n) {
d = n % 10;
if ((n > 0 && y > (0x7fffffff - d) / 10) ||
(n < 0 && y < ((signed)0x80000000 - d) / 10)) {
return 0;
}
y = y * 10 + d;
n = n / 10;
}
return y;
}
int main(void)
{
int i = 123;
printf("Original integer: %d ",i);
printf("\nReverse integer: %d ",reverse(i));
i = 208478933;
printf("\nOriginal integer: %d ",i);
printf("\nReverse integer: %d ",reverse(i));
i = -73634;
printf("\nOriginal integer: %d ",i);
printf("\nReverse integer: %d ",reverse(i));
return 0;
}
Sample Output:
Original integer: 123 Reverse integer: 321 Original integer: 208478933 Reverse integer: 339874802 Original integer: -73634 Reverse integer: -43637
Flowchart:
C Programming Code Editor:
Improve this sample solution and post your code through Disqus.
Previous: C Math Exercises Home
Next: Write a C program to check whether an integer is a palindrome or not.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
C Programming: Tips of the Day
Static variable inside of a function in C
The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().
The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.
The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().
Ref : https://bit.ly/3fOq7XP
- New Content published on w3resource:
- HTML-CSS Practical: Exercises, Practice, Solution
- Java Regular Expression: Exercises, Practice, Solution
- Scala Programming Exercises, Practice, Solution
- Python Itertools exercises
- Python Numpy exercises
- Python GeoPy Package exercises
- Python Pandas exercises
- Python nltk exercises
- Python BeautifulSoup exercises
- Form Template
- Composer - PHP Package Manager
- PHPUnit - PHP Testing
- Laravel - PHP Framework
- Angular - JavaScript Framework
- Vue - JavaScript Framework
- Jest - JavaScript Testing Framework