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- #include <stdio.h>
- #include <stdlib.h>
- #include <math.h>
- #define NUMBER 600851475143
- int isitprime(unsigned long int);
- int main()
- {
- unsigned long int x = 1;
- unsigned int largestprime = 42;
- int y;
- for (x = 1; x <= sqrt(NUMBER); x++)
- {
- printf("Testing %li \n", x);
- if ((NUMBER % x) == 0)
- if ((y = isitprime (x)))
- largestprime = x;
- }
- printf("Largest prime is: %i", largestprime);
- return 0;
- }
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