思考:偶数不可能是素数,缩小范围,减小计算量,奇数中只能被自己和1整除的数就是素数。
#include <stdio.h>
#include <stdlib.h>
int main()
{
int number;
int divisor;
printf("1\n2\n");
for(number = 3; number <= 100; number = number + 2)
{
for(divisor = 3; divisor < number; divisor = divisor + 2)
{
if(number % divisor == 0)
break;
}
if(divisor >= number)
printf("%d\n", number);
}
return 0;
}