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feat: Project Euler Problem 7 - #167 (#598)

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* Please check this solution to Q7 of Project Euler

* rename file

* fix code formatting

* added doc

* updating DIRECTORY.md

* added see-also references

Co-authored-by: adityasheth305 <43900942+adityasheth305@users.noreply.github.com>
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
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Krishna Vedala 2020-09-03 08:51:59 -04:00 committed by GitHub
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commit 23b2a290fb
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DIRECTORY.md
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@ -324,6 +324,7 @@
* [Sol](https://github.com/TheAlgorithms/C/blob/master/project_euler/problem_6/sol.c)
* Problem 7
* [Sol](https://github.com/TheAlgorithms/C/blob/master/project_euler/problem_7/sol.c)
* [Sol2](https://github.com/TheAlgorithms/C/blob/master/project_euler/problem_7/sol2.c)
* Problem 8
* [Sol1](https://github.com/TheAlgorithms/C/blob/master/project_euler/problem_8/sol1.c)
* [Sol2](https://github.com/TheAlgorithms/C/blob/master/project_euler/problem_8/sol2.c)

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project_euler/problem_7/sol.c
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@ -1,11 +1,14 @@
/**
* \file
* \brief [Problem 7](https://projecteuler.net/problem=7) solution
* \brief [Problem 7](https://projecteuler.net/problem=7) solution.
* @see Another version: problem_7/sol2.c
*/
#include <stdio.h>
#include <stdlib.h>
/** Main function */
/** Main function
* @return 0 on exit
*/
int main(void)
{
char *sieve;

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project_euler/problem_7/sol2.c Normal file
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/**
* \file
* \brief [Problem 7](https://projecteuler.net/problem=7) solution.
* @see Faster version problem_7/sol.c
*/
#include <stdio.h>
/** Main function
* @return 0 on exit
*/
int main()
{
int n;
scanf("%d", &n);
int number_of_prime = 0;
for (int i = 2;; i++)
{
int divisors = 0;
for (int j = 1; j <= i; j++)
{
if (i % j == 0)
{
divisors++;
}
}
if (divisors == 2)
{
number_of_prime++;
if (number_of_prime == n)
{
printf("%d", i);
break;
}
}
}
return 0;
}