这个for循环为什么输出全是2.000

Question

#include <stdio.h>
int main()
{
    double n, a = 2.0, b = 1, sum=0, c, i;
    scanf("%lf", &n);
    for (i = 1; i <=n; i++);
    {
    sum =sum+(a / b);
        c = a + b;
        b = a;
        a = c;
    }
    printf("sum=%.3lf", sum);
    return 0;
}
![img](https://img-mid.csdnimg.cn/release/static/image/mid/ask/018279467796111.png "#left")

Answer 1

你把第7行for后面的分号删掉