tmp1

Author: archibate

15/06/b.cpp

@@ -0,0 +1,13 @@
+#include <string>
+#include <iostream>
+
+using namespace std;
+
+int main() {
+    string s = "helloworld"s;
+    cout << "从第2个字符开始长为5的子字符串:    " << s.substr(2, 4) << endl;
+    cout << "从第2个字符开始长为99的子字符串:   " << s.substr(2, 99) << endl;
+    cout << "从第2个字符开始直到末尾的子字符串: " << s.substr(2) << endl;
+    cout << "从头开始长为5的子字符串:           " << s.substr(0, 4) << endl;
+    cout << "从第100个字符开始长为5的子字符串:  " << s.substr(100, 5) << endl;
+}

15/06/c.cpp

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+#include <string>
+#include <iostream>
+
+using namespace std;
+
+int main() {
+    string s = "helloworld"s;
+    cout << "寻找h的结果：" << s.find('h') << endl;
+    cout << "寻找e的结果：" << s.find('e') << endl;
+    cout << "寻找l的结果：" << s.find('l') << endl;
+    cout << "寻找o的结果：" << s.find('o') << endl;
+    cout << "寻找H的结果：" << s.find('H') << endl;
+    cout << "(size_t) -1：" << (size_t)-1 << endl;
+}

15/06/d.cpp

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+#include <string>
+#include <iostream>
+
+using namespace std;
+
+int main() {
+    string s = "helloworld"s;
+    cout << boolalpha;
+    cout << "h: " << (s.find('h') != string::npos) << endl;
+    cout << "z: " << (s.find('z') != string::npos) << endl;
+}

15/06/e.cpp

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+#include <string>
+#include <iostream>
+
+using namespace std;
+
+int main() {
+    string s = "helloworld"s;
+    cout << boolalpha;
+    cout << "lo: " << s.find("lo") << endl;
+    cout << "wo: " << s.find("wo") << endl;
+    cout << "ma: " << s.find("ma") << endl;
+}