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C Exercises: Find the largest prime factor of the number 438927456

C Programming Practice: Exercise-19 with Solution

The prime factors of 13195 are 5, 7, 13, 29.
Write a C programming to find the largest prime factor of the number 438927456?.

C Code:

#include <stdio.h>
int main(void)
{
  unsigned long long n = 438927456L;
  unsigned long long i;
  for (i = 2ULL; i < n; i++) {
  	//1ULL is 'unsigned long long
    while (n % i == 0) {
      n /= i;
    }
  }
  printf("%llu\n", n);
  return 0;
}

Sample Output:

415651

Flowchart:

C Programming Flowchart: Find the largest prime factor of the number 438927456.

C Programming Code Editor:

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Previous: Write a C programming to find the sum of the even-valued terms from the terms in the Fibonacci sequence whose values do not exceed one million.
Next: Write a C programming to find the largest palindrome made from the product of two 3-digit numbers.

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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