#include <cstdio>
int main() {
double sum = 0;
int flag = 1;
for (int i = 1; i <= 100; i++) {
sum += flag * 1.0 / i;
flag = -flag;
}
printf("%lf\n", sum);
}
int main() {
double sum = 0;
int flag = 1;
for (int i = 1; i <= 100; i++) {
sum += flag * 1.0 / i;
flag = -flag;
}
printf("%lf\n", sum);
}
答案：0.688172
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第1个回答 2016-05-19
float s = 1.0f;
int i;
float n = -1.0f;
for(i = 2;i <= 100;++i){
s += n/i;
n = -n;
}
int i;
float n = -1.0f;
for(i = 2;i <= 100;++i){
s += n/i;
n = -n;
}
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