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C++ String replace() function

C++ String replace function tutorial for beginners and professionals with examples on constructor, if-else, switch, break, continue, comments, arrays, object and class, exception, static, structs, inheritance, aggregation etc.

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C++ String replace()

This function replaces the portion of string that begins at character position pos and spans len characters.

Syntax

Consider two strings str1 and str2. Syntax would be:

str1.replace(pos,len,str2);

Parameters

  • str : str is a string object, whose value to be copied in another string object.
  • pos : pos defines the position, whose character to be replaced.
  • len : Number of characters to be replaced by another string object.
  • subpos : It defines the position of the first character of string object that is to be copied to another object as replacement.
  • sublen : Number of characters of string object to be copied into another string object.
  • n : Number of characters to be copied into an another string object.

Return value

This function does not return any value.

Example 1

First example shows how to replace given string by using position and length as parameters.

#include<iostream>
using namespace std;
int  main()
{
string str1 = "This is C language";
string str2 = "C++";
cout << "Before replacement, string is :"<<str1<<'\n';
str1.replace(8,1,str2); 
cout << "After replacement, string is :"<<str1<<'\n';
return 0;
}

Output:

Before replacement , string is This is C language
After replacement, string is This is C++ language

Example 2

Second example shows how to replace given string using position and length of the string which is to be copied in another string object.

#include<iostream>
using namespace std;
int main()
{
string str1 ="This is C language"
 string str3= "java language";
cout <<"Before replacement, String is "<<str1<<'\n';
str1.replace(8,1,str3,0,4); 
cout<<"After  replacement,String is "<<str1<<'\n';
return 0;
}

Output:

Before replacement, String is This is C language
After replacement, String is This is java language

Example 3

Third example shows how to replace the string by using string and number of characters to be copied as parameters.

#include<iostream>
using namespace std;
int main()
{
string str1="This is C language";
cout<<"Before replacement,string is"<<str1<<'\n';
str1.replace(8,1,"C##",2); 
cout<<"After replacement,string is"<<str1;
return 0;
}

Output:

Before replacement,string is This is C language
After replacement,string is This is C# language

Next TopicC++ Strings




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