# C Exercises: Find the largest palindrome made from the product of two 3-digit numbers

## C Programming Practice: Exercise-20 with Solution

A palindrome is a word, number, phrase, or other sequence of characters which reads the same backward as forward, such as taco cat or madam or racecar or the number 10801. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 × 99.

Write a C programming to find the largest palindrome made from the product of two 3-digit numbers.

**C Code:**

```
#include <stdio.h>
static int test_palindromic(unsigned int n);
int main(void)
{
unsigned int i, j, max = 0;
for (i = 100; i <= 999; i++) {
for (j = 100; j <= 999; j++) {
unsigned int p = i*j;
if (test_palindromic(p) && p > max) {
max = p;
}
}
}
printf("%u\n", max);
return 0;
}
int test_palindromic(unsigned int n)
{
unsigned int reversed_num = 0, t = n;
while (t) {
reversed_num = 10*reversed_num + (t % 10);
t /= 10;
}
return reversed_num == n;
}
```

Sample Output:

906609

**Flowchart:**

## C Programming Code Editor:

** Contribute your code and comments through Disqus.**

**Previous:** Write a C programming to find the largest prime factor of the number 438927456?.

**Next:** Write a C programming to find the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?.

**What is the difficulty level of this exercise?**

Test your Programming skills with w3resource's quiz.

## C Programming: Tips of the Day

** Maximum value of int:**

In C:

#include <limits.h> then use int imin = INT_MIN; // minimum value int imax = INT_MAX;

or

#include <float.h> float fmin = FLT_MIN; // minimum positive value double dmin = DBL_MIN; // minimum positive value float fmax = FLT_MAX; double dmax = DBL_MAX;

Ref : https://bit.ly/3fi8yk9

**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