On the Replace () method in C + + _c language

In this paper, we mainly give nine sample programs for the use of Replace function in C + +:

Usage One:

 * * Replaces the specified string with str with the character 
 *string& replace (size_t pos, size_t len, const string& str) Starting at the beginning of the POS length as Len; 
 * * 
int main () 
{string Line 
 = "this@ is@ a Test string!"; 
 line = Line.replace (Line.find ("@"), 1, ""); Replace the first @ for empty 
 cout << line << Endl from the first @ position; 
 return 0; 
} 

Run Result:

Usage Two:

 * * Replace the character *string& replace with Str at the start and end of the iterator 
 (const_iterator i1, const_iterator i2, const string& str) ; 
 * * 
int main () 
{string Line 
 = "this@ is@ a Test string!"; 
 line = Line.replace (Line.begin (), Line.begin () +6, ""); Replaces 6 characters 
 cout << line << Endl with str starting from begin position; 
 return 0; 
} 

Run Result:

Usage Three:

 * * Replace the string from the specified position with the specified substring (given starting position and length) of substr 
 *string& replace (size_t pos, size_t len, const string& STR, size_t Subpos, size_t sublen); 
 * * 
int main () 
{string Line 
 = "this@ is@ a Test string!"; 
 String substr = "12345"; 
 line = Line.replace (0, 5, substr, Substr.find ("1"), 3); Replaces line 
 cout << line << Endl from 0 to 5 positions with the specified substring of the substr (from 1 digits of 3 characters); 
 return 0; 
} 

Run Result:

Usage IV:The compiler may report a warning when char* is not recommended

 * * Replace the string with str starting at the specified position of 0 with a length of 5 
 *string& replace (size_t pos, size_t len, const char* s); 
 * * 
int main () 
{string Line 
 = "this@ is@ a Test string!"; 
 char* str = "12345"; 
 line = Line.replace (0, 5, str); Replaces the string 
 cout << line << Endl with Str with a start length of 5 from the specified position 0; 
 return 0; 
} 

Run Result:

usage Five:string The compiler may report a warning when char* is not recommended

 * * Replace the string from the specified iterator position with str 
 *string& replace (const_iterator i1, const_iterator i2, const char* s); 
 * * 
int main () 
{string Line 
 = "this@ is@ a Test string!"; 
 char* str = "12345"; 
 line = Line.replace (Line.begin (), Line.begin () +9, str); Replaces the string from the specified iterator position with str 
 cout << line << Endl; 
 return 0; 
} 

Run Result:

usage Six:the compiler may report a warning when a string is char*, not recommended

 /* * Replace the string 
 *string& replace (size_t pos, size_t len, const char* S, size_t N) with the first n characters of S, from the start position pos length len; 
 * * 
int main () 
{string Line 
 = "this@ is@ a Test string!"; 
 char* str = "12345"; 
 line = Line.replace (0, 9, str, 4); Replaces the string 
 cout << line << Endl with the first 4 characters of Str from a 0 position starting length of 9; 
 return 0; 
} 

Run Result:

usage Seven:string The compiler may report a warning when char* is not recommended

 * * Replaces the string with the first n characters of s with the specified iterator position (from I1 to I2) 
 *string& replace (const_iterator i1, const_iterator i2, const char* s, size_t n); 
 * * 
int main () 
{string Line 
 = "this@ is@ a Test string!"; 
 char* str = "12345"; 
 line = Line.replace (Line.begin (), Line.begin () +9, str, 4); Replaces the string at the specified iterator position with the first 4 characters of str 
 cout << line << Endl; 
 return 0; 
} 

Run Result:

usage Eight:

 

* * * Replace the contents of the POS length of Len with the repeated n-C characters 
 *string& replace (size_t pos, size_t len, size_t N, char c); 
 * * 
int main () 
{string Line 
 = "this@ is@ a Test string!"; 
 char c = ' 1 '; 
 line = Line.replace (0, 9, 3, C); Replace the content from the specified position 0 length 9 with a repeat of the C character of 3 times 
 cout << line << Endl; 
 return 0; 
} 

Run Result:

Usage Nine:

 * * Replace the contents of the specified iterator position (starting from i1 to end) with the repeated n C characters 
 *string& replace (const_iterator i1, Const_iterator i2, size_t N, char c); 
 * * 
int main () 
{string Line 
 = "this@ is@ a Test string!"; 
 char c = ' 1 '; 
 line = Line.replace (Line.begin (), Line.begin () +9, 3, C); Replace the content from the specified iterator position with a repeat of the C character of 3 times 
 cout << line << Endl; 
 return 0; 
} 

Run Result:

Note: All parameters that use an iterator type are not limited to string types, and can be a vector, list, and other type of iterator.