随笔分类 - c++
摘要：void pop_back();//弹出最后一个字符 #include <string>#include <iostream> using namespace std;int main(){ string str("hello world!"); str.pop_back(); cout << st
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摘要：string (1) string& insert (size_t pos, const string& str); substring (2) string& insert (size_t pos, const string& str, size_t subpos, size_t sublen);
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摘要：allocator_type get_allocator() const noexcept; 返回和对象相关的分配器的一个拷贝 #include <iostream>#include <string>#include <vector>using namespace std;int main(){ v
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摘要：char& front(); const char& front() const;功能：返回string对象的首个字符，可以改变它的值 #include <string>#include <iostream> using namespace std; int main(){ string s1("t
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摘要：string (1) size_t find_last_of (const string& str, size_t pos = npos) const noexcept; c-string (2) size_t find_last_of (const char* s, size_t pos = np
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摘要：#include <iostream>#include <string> using namespace std;int main(){ string s1("abcdemyyngl"); string s2("mngf"); size_t n = s1.find_last_not_of(s2);
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摘要：string (1) size_t find_first_of (const string& str, size_t pos = 0) const noexcept; c-string (2) size_t find_first_of (const char* s, size_t pos = 0)
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摘要：string (1) size_t find_first_not_of (const string& str, size_t pos = 0) const noexcept; c-string (2) size_t find_first_not_of (const char* s, size_t p
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摘要：sequence (1) string& erase (size_t pos = 0, size_t len = npos);两个参数都有默认值，传递的唯一参数匹配第一个 character (2) iterator erase (const_iterator p);//擦除迭代器指定的一个字符 r
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摘要：bool empty() const noexcept;注：判断string对象是否为空，为空返回true #include <iostream>#include <string> using namespace std; int main(){ string line; string conten
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摘要：const char* data() const noexcept;注：同c_str #include <iostream>#include <string>#include <cstring>using namespace std;int main(){ string s1("hellolyy")
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摘要：const char* c_str() const noexcept;功能：返回c风格字符转 #include <iostream>#include <string>#include <cstring>using namespace std; int main(){ string s1("i lov
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摘要：const_reverse_iterator crbegin() const noexcept;功能：crbegin是最后一个字符，crend第一个字符的前一个。迭代器向左移动是“+”，向右移动是“-” #include <iostream>#include <string> using names
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摘要：size_t copy (char* s, size_t len, size_t pos = 0) const;功能：把string的pos位置开始的len字节copy到s注意：s的最后要手动添加字符串结束标志 #include <iostream>#include <string> using n
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摘要：void clear() noexcept;功能：把string对象置为空 #include <iostream>#include <string> using namespace std; int main(){ char c; string str; cout << "please enter
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摘要：const_iterator cbegin() const noexcept; const_iterator cend() const noexcept;注：返回常量迭代器，不能修改 #include <iostream>#include <string> using namespace std;
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摘要：size_t capacity() const noexcept; #include <iostream>#include <string> using namespace std; int main(){ string s1("hello"); cout << "capacity:" << s1.
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摘要：iterator begin() noexcept; const_iterator begin() const noexcept; iterator end() noexcept; const_iterator end() const noexcept; #include <iostream>#in
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摘要：char& back(); const char& back() const; #include <iostream>#include <string> using namespace std;int main(){ string s1("hello"); cout << s1.back() <<
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摘要：char& at (size_t pos); const char& at (size_t pos) const; #include <string>#include <iostream> using namespace std;int main(){ string s1("test"); for(
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