mirror of
https://github.com/TheAlgorithms/C
synced 2024-11-24 22:39:52 +03:00
Add Sieve of Eratosthenes
This commit is contained in:
parent
bb8c41b2de
commit
b5b5ec103b
46
primes.c
Normal file
46
primes.c
Normal file
@ -0,0 +1,46 @@
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <stdbool.h>
|
||||
|
||||
void primes(bool * primeList, int len) {
|
||||
int i, j;
|
||||
|
||||
// Initiallize the list
|
||||
for (i = 0; i < len; i++) {
|
||||
primeList[i] = true;
|
||||
}
|
||||
primeList[0] = false; // 0 is not prime
|
||||
primeList[1] = false; // 1 is not prime
|
||||
|
||||
for (i = 0; i < len; i++) {
|
||||
if (primeList[i] == true) {
|
||||
for (j = i*i; j < len; j = j+i) {
|
||||
primeList[j] = false;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
int main(void) {
|
||||
int size, i;
|
||||
bool * list;
|
||||
|
||||
// Ask for the largest value to check primeness
|
||||
printf("Maximum value: ");
|
||||
scanf("%d", &size);
|
||||
|
||||
// Allocate list to act as prime mask
|
||||
list = malloc(sizeof(bool) * size);
|
||||
|
||||
// Populate list
|
||||
primes(list, size);
|
||||
|
||||
// Print prime numbers
|
||||
for (i = 0; i < size; i++) {
|
||||
if (list[i] == true) {
|
||||
printf("%d\n", i);
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
Loading…
Reference in New Issue
Block a user