用find_first_of筛分字符串

Practice 9.47

#include <iostream>
#include <queue>
#include <string>
#include <vector>
#include <map>
#include <algorithm>
#include <list>
#include <iterator>
#include <cmath>
#include <cstring>
#include <forward_list>
#include <sstream>
using namespace std;string dic_of_number = "1234567890";
string res_of_number = "";
string res_of_alp = "";
int pos;
void find_number(const string & s) {while(pos<(int)s.length() && (pos = s.find_first_of(dic_of_number,pos))) {res_of_number += s[pos];pos ++;}
}void find_alp(const string & s) {while(pos<(int)s.length()) {pos = s.find_first_not_of(dic_of_number, pos);if(pos==-1) break;res_of_alp += s[pos];pos ++; }
}int main() {res_of_number = "";res_of_alp = "";string s = "jin4hai8jia4";pos = 0;cout << "original string: " << s << endl;find_number(s);cout << "number string: ";cout << res_of_number << endl;pos = 0;    find_alp(s);    cout << "alp string: ";cout << res_of_alp << endl;return 0;
}

Output

original string: jin4hai8jia4
number string: 484
alp string: jinhaijia

不矫情，想约你出去

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金海佳学C++primer 练习9.47

用find_first_of筛分字符串

Practice 9.47

Output

不矫情，想约你出去

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