Create 1073.Scientific Notation （20 分）.cpp

PAT/PAT-A/CPP/1073.Scientific Notation （20 分）.cpp

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+#include <iostream>
+using namespace std;
+int main(){
+	string s;
+	cin >> s;
+	int i = 0;
+	while(s[i] != 'E') i++;
+	string t = s.substr(1, i-1);
+	int n = stoi(s.substr(i+1));
+	if(s[0] == '-') cout << "-";
+	if (n < 0){
+		cout << "0.";
+		for(int j = 0; j < abs(n) - 1; j++) cout << '0';
+		for (int j = 0; j < t.length(); j++)
+			if(t[j] != '.') cout << t[j];
+	}else{
+		cout << t[0];
+		int cnt, j;
+		for(j = 2, cnt = 0;j < t.length() && cnt < n; j++, cnt++) cout << t[j];
+		if (j == t.length()){
+			for(int k = 0; k < n - cnt; k++) cout << '0';
+		}else{
+			cout << '.';
+			for(int k = j; k < t.length(); k++) cout << t[k];
+		}
+	}
+	return 0;
+}