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#include <iostream>
#include <string>
using namespace std;

int mian() {
int times_count;
char Replace_words, Words_after_replacement, Overall_sentence_judge[200];
string Overall_sentence;
cin >> Overall_sentence_judge >> Replace_words >> Words_after_replacement;
Overall_sentence = Overall_sentence_judge;
for (int i = 1; i <= Overall_sentence.size(); i++) {
if (Overall_sentence_judge[i - 1] == Replace_words)
Overall_sentence_judge[i - 1] = Words_after_replacement;
}
cout << Overall_sentence_judge;
return 0;
}

这串代码编译错误，这是一本通2046的一道替换字符串的题

求各位C++大佬给可怜的我看看哪里出了问题。