why!

nobody_here @ 2024-01-29 21:44:07

#include<iostream>
using namespace std;
double jh(int n){
    double num=0;
    for(int i=1;i<=n;i++){
        num+=1/i;
    }
    return num;
}
int main(){
    double a;
    cin>>a;
    for(int i=1;i<=a;i++){
        if(jh(i)>a){
            cout<<i;
            return 0;
        }
    }
    return 0;
}

by Lijunzhuo @ 2024-01-29 21:45:16

1.0

by Lijunzhuo @ 2024-01-29 21:45:51

1.0/i 要转double

by Lijunzhuo @ 2024-01-29 21:46:37

#include<iostream>
using namespace std;
double jh(int n){
    double num=0;
    for(int i=1;i<=n;i++){
        num+=1/i;
    }
    return num;
}
int main(){
    double a;
    cin>>a;
    for(int i=1;i<=a;i++){
        if(jh(i)>a){
            cout<<i;
            return 0;
        }
    }
    return 0;
}

by Lijunzhuo @ 2024-01-29 21:47:37

#include<iostream>
using namespace std;
double jh(int n){
    double num=0;
    for(int i=1;i<=n;i++){
        num+=1.0/i;
    }
    return num;
}
int main(){
    double a;
    cin>>a;
    for(int i=1;i<=a;i++){
        if(jh(i)>a){
            cout<<i;
            return 0;
        }
    }
    return 0;
}

发错了qwq

by kotoamatsukami @ 2024-01-31 11:41:37

@nobody_here 为什么是两个循环？ 其实不需要主程序中的循环i

by nobody_here @ 2024-02-02 21:33:29

谢谢大佬们，AC了