String∷: String({ /构造函数:创建一个空串 ch= new char maxLen+1];/创建串数组 if(ch== NULL)t cer<<“存储分配错!n” exit(1); curlen =u ch|0]=“0String :: String ( ) { //构造函数：创建一个空串 ch = new char[maxLen+1]; //创建串数组 if ( ch == NULL ) { cerr << “存储分配错!\n”; exit(1); } curLen = 0; ch[0] = ‘\0’; }