下標(biāo)的方法：

9.43題

#include <iostream> #include <string> using namespace std; void replace_(string &s,const string &oldval,const string & newval) {for(size_t i = 0;i != s.size(); ++ i){if(s[i] == oldval[0]){string temp(s,i,oldval.size());cout << "Temp is:"<< temp << endl;if(temp == oldval){s = s.erase(i,oldval.size());s = s.insert(i,newval);cout << "old i is:" << i << endl;i = i + newval.size() - 1;cout << "new i is :"<<i <<endl << endl;if(i == s.size()){cout << "yes,break it"<<endl << endl;break;}}}} } int main() { string oldval{"tho"};string s{"asdfasthoasdfthoasdstho"},ss;string newval{"thouth"};replace_(s,oldval,newval);return 0; }

９．４４題

迭代器的方法：

#include <iostream> #include <string> using namespace std; //replace oldval by newval object to s1 void replace_(string &s1,const string & oldval,const string & newval) {for(string::iterator it = s1.begin();it != s1.end() ; ++ it){if(*it == *oldval.begin()){string new_str(it,it + oldval.size());if(new_str == oldval){it = s1.erase(it,it+oldval.size());it = s1.insert(it,newval.begin(),newval.end());it += 5; }}} return ; } int main() {string s1 = "asdfasdfthoasdfthoasftho";string oldval = "tho";string newval = "though";unsigned cnt = 1;cout << s1 <<endl;replace_(s1,oldval,newval);cout << s1 <<endl;return 0; }

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總結(jié)

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