pat a1073

很麻烦，要时刻心中有数据

#include <cstdio>
#include <iostream>
#include <cstring>
#include <algorithm>
#include <vector>
#include <string> 
using namespace std;
char shuzi[11000];
char zhishushuzu[11000];
int main(){
	freopen("1.txt","r",stdin);
	string str;
	cin>>str;
	if(str[0]=='-'){
		cout<<"-";
	}
	str.erase(str.begin());
	int lenthofstr=str.length();
	int location_of_e;
	for(int i=0;i<lenthofstr;i++){
		if(str[i]=='E'){
			location_of_e=i;
			break;
		}
	}
	//cout<<str.c_str();
    strcpy(shuzi,str.c_str());
    for(int i=location_of_e+1;i<strlen(shuzi);i++){
    	zhishushuzu[i-location_of_e-1]=shuzi[i];
    }
    int zhishu;
    sscanf(zhishushuzu,"%d",&zhishu);
    //cout<<zhishu;
    if(zhishu<0){
    	printf("0.");
    	int t=abs(zhishu);
    	for(int i=0;i<t-1;i++){
	    	cout<<"0";
	    }
	    for(int i=0;i<location_of_e;i++){
    		if(shuzi[i]!='.') cout<<shuzi[i];
    	}
    	cout<<endl;
    }else{
    	str.erase(str.begin()+1);
    	int shuzichangdu=location_of_e-1;
    	int i=0;
    	//while(1);
    	//cout<<shuzichangdu<<endl<<zhishu;
    	for( i=0;i<shuzichangdu&&zhishu>=0;i++){
	    	if (str[i]=='.') continue;
			cout<<str[i];
			zhishu--;
    		
	    }
	    if(i==shuzichangdu&&zhishu==-1) return 0;
	    if(i<shuzichangdu){
	    	cout<<".";
    		for (;i<shuzichangdu;i++){
		    	cout<<str[i];
		    }
    	}else if(zhishu>=0){
	    	for (int j=0;zhishu>=0;j--){
	    		cout<<"0";
	    		zhishu--;
	    	}
	    }
	    cout<<endl;
    }
	return 0;
}