#include <stdio.h>
 
void func(int n) {
    static int count = 0;
    count++;
    printf("%dは%d番目の素数\n", n, count);
}
 
int prime(int n) {
    int i;
    int sosuu = 1;
    for(i=2; i<n; i++) {
        if(n%i == 0) {
            sosuu=0;
            break;
        }
    }
    return sosuu;
}
 
int main(void) {
    int x;
    for(int i=2; i<20; i++){
        x = prime(i);
        if (x == 1){
            func(i);
        }
    }
    return 0;
}

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