C++ String replace
This function substitutes the section of a string that starts at character position pos and covers a length of len characters.
Syntax
Consider two strings str1 and str2. The syntax is as follows:
Example
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
The initial example demonstrates the process of replacing a specified string by utilizing position and length as parameters.
Example
#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:
Output
Before replacement , string is This is C language
After replacement, string is This is C++ language
Example 2
The following example demonstrates how to substitute a specified string by utilizing the position and length of the string that is to be duplicated into another string object.
Example
#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:
Output
Before replacement, String is This is C language
After replacement, String is This is java language
Example 3
Third demonstration illustrates how to substitute a string by specifying both the string and the number of characters to be copied as arguments.
Example
#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:
Output
Before replacement,string is This is C language
After replacement,string is This is C# language
