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本题的目标很简单，就是判断一个给定的正整数是否素数。
输入格式：
输入在第一行给出一个正整数N（≤ 10），随后N行，每行给出一个小于2^31
的需要判断的正整数。
输出格式：
对每个需要判断的正整数，如果它是素数，则在一行中输出Yes，否则输出No。
输入样例：
2
11
111
输出样例：
Yes
No
#include <stdio.h> #include <math.h> int main() { int n, i, shaobing; long x;
scanf("%d", &n); //输入的n个数 while(n--) { scanf("%ld", &x); shaobing = 1;//哨兵的初始化
for(i = 2; i <= sqrt(x); i++)//只需要计算到他的平方根就可以 { if(x % i == 0) { shaobing = 0;
break; } } if(x == 1 || shaobing == 0) printf("No\n"); else printf("Yes\n"); }
return 0; }
