字符逆序

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#include<iostream> #include<string>using namespace std;string change(string s){int len= s.length();char t;for (int i = 0, j = len - 1; i < j; i++, j--){t = s[i];s[i] = s[j];s[j] = t;}return s;}void main(){char s[100];gets_s(s);cout << change(s) << endl;cout << endl;system("pause");}