1 #include <iostream> 2 using namespace std; 3 #include <string> 4 5 6 //初始化操作 7 void test01() { 8 //初始化操作 9 string s1; 10 string s2(10, 'a'); 11 string s3("abc"); 12 string s4(s3); 13 14 cout << s1 << endl; 15 cout << s2 << endl; 16 cout << s3 << endl; 17 cout << s4 << endl; 18 19 20 } 21 //赋值操作 22 void test02() { 23 //赋值操作 24 string s1; 25 string s2("appasd"); 26 s1 = "132456"; 27 cout << s1 << endl; 28 s1 = s2; 29 cout << s1 << endl; 30 s1 = 'a'; 31 cout << s1 << endl; 32 33 //成员方法 assign 34 s1.assign("jsk"); 35 cout << s1 << endl; 36 37 } 38 39 //取值操作 40 void test03() { 41 //取值操作 42 string s1 = "abashjdsa"; 43 44 //重载[]操作符 45 for (int i = 0; i < s1.size(); i++) { 46 cout << s1[i] << " "; 47 } 48 cout << endl; 49 50 //也提供了成员方法 51 for (int i = 0; i < s1.size(); i++) { 52 cout << s1.at(i) << " "; 53 } 54 cout << endl; 55 56 //区别 57 //[] 访问越界直接挂 58 //at(i) 抛出异常 59 try { 60 cout << s1.at(100)<<endl; 61 } 62 catch (...) { 63 cout << "越界 Error...！" << endl; 64 } 65 66 } 67 //拼接操作 68 void test04() { 69 //+= 重载 70 string s = "123"; 71 cout << s << endl; 72 s += "456"; 73 cout << s << endl; 74 string s2 = "abc"; 75 s += s2; 76 cout << s << endl; 77 //append 成员函数重载 78 string s3 = "23"; 79 s.append(s3); 80 cout << s << endl; 81 //等号重载 82 string s4 = s + s3; 83 cout << s4 << endl; 84 85 } 86 87 //string 查找与替换 88 void test05() { 89 string s = "fgabcdefg"; 90 //s.find 查找第一次出现的位置 91 int pos = s.find("z"); 92 cout << "pos: " << pos << endl;//没有 return -1 93 //s.rfind 查找最后一次出现的位置 94 pos = s.rfind('g'); 95 cout << "pos: " << pos << endl; 96 97 98 } 99 //替换 100 void test06() { 101 //替换 102 string s = "abcdefg"; 103 s.replace(0, 2, "1111"); //将0位置开始的2个 ab替换成1111 104 cout << s << endl; 105 } 106 //比较 107 void test07() { 108 //比较 相等返回0 109 string s1 = "abcd"; 110 string s2 = "abc4"; 111 112 if (s1.compare(s2) == 0) { 113 cout << "相等" << endl; 114 } 115 else { 116 cout << "不相等！" << endl; 117 } 118 119 } 120 //字串操作 121 void test08() { 122 string s = "abcsdsfsadas"; 123 string substring = s.substr(1, 3);//取s的从1位置开始的3个字符的字串 124 cout << substring << endl; 125 126 } 127 //插入 删除 128 void test09() { 129 string s = "asfasddfsa"; 130 s.insert(1, "123");//在s[1]位置前插入123 131 cout << s << endl; 132 s = "1423999"; 133 s.erase(0, 4);//删除 s[0]开始的4个字符 134 cout << s << endl; 135 } 136 int main() { 137 test09(); 138 }
