循环内int i=？其实没有固定的值，问题在于能否能使循环次数不多不少； 要注意特别是循环中else用不用，用在哪个地方，是否在条件执行时对结果产生错误影响，比如这道题当n==k时就可能影响得出的Bsum数； （如果i！=k而是i=1）```cpp #define _CRT_SECURE_NO_WARNINGS #include #include <stdio.h> using namespace std; int main() { int a = 0, b = 0, c = 0, d = 0, i = 1, j = 0; double h = 0, l = 0, e = 0, f = 0; scanf("%d%d", &a, &b); for (i = 1; i <= a; i++) { j++; if (j % b == 0) { c = c + j; h++; }

}
d = a * (a + 1) / 2 - c;
		l = a - h;
e = double(c);
e = e / h;
f = double(d);
f = f / l;
printf("%.1lf %.1lf%.1lf %.1lf", e, f,h,l);
return 0;

}