size_t f2=strd.find_first_not_of(s_fmt_a);if(f2 == std::string::npos){ std::cout<<"strd NOT find"<<std::endl; }else{ std::cout<<"strd find at:"<< f2 <<std::endl; } size_t f3=stre.find_first_not_of(s_fmt_a);if(f3 == std::string::npos){ std::cout<<"stre ...
// CPP code for string::find_first_not_of(const char* cstr) const#include<iostream>usingnamespacestd;// Function to demonstratefind_first_not_ofvoidfind_first_not_ofDemo(stringstr){// Finds first character in str which// is not present in "geeksforgeeks"string::size_type ch = str.fin...
size_t find_first_not_of ( const char* s, size_t pos, size_t n ) const;n是s中的字符数...
std::string.find_first_not_of是C++标准库中的一个字符串查找函数,用于在给定字符串中查找第一个不在指定字符集合中的字符,并返回其位置。 该函数的原型如下: 代码语言:cpp 复制 size_t find_first_not_of (const string& str, size_t pos = 0) const noexcept; 参数说明: str:要查找的字符...
find_first_not_of("0123456789."); // 查找第一个不是数字和小数点的字符位置 if(pos != std::string::npos) { std::cout << "第一个不是数字和小数点的字符在第" << pos << "个位置:" << str[pos] << std::endl; } else { std::cout << "字符串中没有不是数字和小数点的字符" <...
b、如果pos2指定的位置超出替换字符串str的范围,抛出std::out_of_range异常,不捕捉将导致coredump。 函数2:std::string& replace(size_type pos, size_type n1, const char * s, size_type n2); 该函数的作用:使用字符串s的前n2个字符,替换当前字符串从pos位置开始处的n1个字符。即函数将当前字符串从pos...
string::find_first_not_of string::find_last_not_of 这两个可以去除首尾的空格 /***begin test file***/ #include <iostream> #include <string> int main() { std::string str1 = " hello world! "; std::string trimstring = " "; std::cout << "str = ...
find_first_not_of('G'); cout << "First unmatched character : "; cout << str[ch]; } // Driver code int main() { string str("GeeksforGeeks"); cout << "Original String : " << str << endl; find_first_not_ofDemo(str); return 0; } 复制 输出: Original String : Geeksfor...
= std::string::npos; first += replacement.size()) { last = data.find_first_not_of(pattern, first + 1); if (last == std::string::npos) last = data.length(); // Now first at '%' and last is one past end of the found substring data.replace(first, last - first, replacement...
std::basic_string::data std::basic_string::empty std::basic_string::end std::basic_string::erase std::basic_string::find std::basic_string::find_first_not_of std::basic_string::find_first_of std::basic_string::find_last_not_of ...