1073 Scientific Notation (20 分)（字符串处理）

#include <cstdio>
#include <cstring>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <cmath>
#include <unordered_map> 
#include <algorithm>
#include <iostream>
using namespace std;

int n, m, e;
string s, t;
int arr[10000];

int main() 
{
    cin >> s;
    int i = s.find("E");
    int l = s.size();
    t = s.substr(1, i-1);
    e = stoi(s.substr(i+1, l-i-1));
    
    if (e > 0) {
    	if (s[0] == '-') cout << '-';
    	cout << t[0];
		int l2 = t.size();
    	for (int i = 1; i<l2; i++) {
    		if (t[i] == '.') continue;
    		if (e > 0) {
    			cout << t[i];
    			e--;
			} else {
				cout << '.';
				cout << t.substr(i, l2-i);
				break;
			}
		}
		for (int i = 0; i<e; i++) cout << '0';
	} else {
		e = abs(e);
		if (s[0] == '-') cout << '-';
		cout << "0.";
		int l2 = t.size();
		while(--e > 0) {
			cout << '0';
		}
		for (int i = 0; i<l2; i++) {
    		if (t[i] == '.') continue;
    		cout << t[i];
		}
	}
	return 0;
}

标签：std,arr,20,Scientific,Notation,int,substr,include,cout
来源： https://blog.csdn.net/NCUscienceZ/article/details/100562842