#include <stdio.h>
 
void func(int n) {
    static int count = 0;
    count++;
    printf("%dは%d番目の素数\n", n, count);
}
 
//引数nが素数かどうかの判定をします
//素数なら１を戻り値として返し，素数でなければ0を返します
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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