Exponential notation

Exponential notation

You are given a positive decimal number x.

Your task is to convert it to the "simple exponential notation".

Let x = a·10b, where 1 ≤ a < 10, then in general case the "simple exponential notation" looks like "aEb". If b equals to zero, the part "Eb" should be skipped. If a is an integer, it should be written without decimal point. Also there should not be extra zeroes in a and b.

Input

The only line contains the positive decimal number x. The length of the line will not exceed 106. Note that you are given too large number, so you can't use standard built-in data types "float", "double" and other.

Output

Print the only line — the "simple exponential notation" of the given number x.

Examples
Input
16
Output
1.6E1
Input
01.23400
Output
1.234
Input
.100
Output
1E-1
Input
100.
Output
1E2
分析:这种题要多注意细节!
代码:
#include <bits/stdc++.h>
using namespace std;
int n,m,cnt,len,l,r,now;
string a,ans;
int main()
{
    int i,j,k,t;
    cin>>a;
    len=a.length();
    //找小数点;
    for(now=0;now<len&&a[now]!='.';now++);
    //找左端点和右端点;
    if(a[l]=='.')l++;if(a[r]=='.')r--;
    for(l=0;a[l]=='0';l++);
    if(a[l]=='.')for(l++;a[l]=='0';l++);
    for(r=len-1;a[r]=='0';r--);
    if(a[r]=='.')for(r--;a[r]=='0';r--);
 
    ans+=a[l];
    if(r!=l){
        ans+='.';
        for(i=l+1;i<=r;i++)if(a[i]!='.')ans+=a[i];
    }
    cnt=now-(l+1);
    if(l+1>now)cnt++;
    cout<<ans;
    if(cnt)cout<<"E"<<cnt;
    cout<<endl;
    //system("pause");
    return 0;
}
原文地址:https://www.cnblogs.com/dyzll/p/5672472.html