string中替換oldVal->newVal

Practice 9.43

#include <iostream> #include <queue> #include <string> #include <vector> #include <algorithm> #include <list> #include <iterator> #include <cmath> #include <cstring> #include <forward_list> #include <sstream> using namespace std;bool ok(string::iterator it1, string s2) {auto it2 = s2.begin();while(it2 != s2.end()) {if(*it1 != *it2) break;it1++, it2++;}if(it2 == s2.end()) return true;else return false; }void old2new(string & s, string oldVal, string newVal) {auto it = s.begin();int len_old = (int)oldVal.length();while(it != s.end()) {if(ok(it, oldVal)) {s.erase(it,it+len_old);s.insert(it,newVal.begin(),newVal.end()); }else {++it;}} }int main() {string s, oldVal, newVal;cin >> s >> oldVal >> newVal;old2new(s,oldVal,newVal);cout << "s: " << s << endl;cout << "old: " << oldVal << endl;cout << "new: " << newVal << endl;cout << s << endl;return 0; }

Ouput

s: jinwanglangjia old: hai new: wanglang jinwanglangjia

The world is his who enjoys it.

總結

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