判断并打印100~200间素数

#include <stdio.h>void main(){int a,b;for(a=100;a<=200;a++){for(b=2;b<a;b++)if(a%b==0)break;     if(a<=b)printf("%d\n",a);}return 0;}

#include <stdio.h>#include <stdlib.h>int main(){int i,j;int count = 0;for (i = 101; i < 200; i += 2){for (j = 2; j <=(i/2); j++){if (i%j == 0)break;}if (j>(i/2)){count++;printf("%d\t", i);}}printf("count=%d\n", count);system("pause");return 0;}

#include <stdio.h>#include <stdlib.h>#include <math.h>int main(){int i;int j;int count = 0;for (i = 101; i < 200; i += 2){for (j = 2; j <=sqrt(i); j++){if (i%j == 0)break;}if (j > sqrt(i)){count++;printf("%d\t", i);}}printf("count=%d\n", count);system("pause");return 0;}

运行结果：