C++ tutorial-assign() function


C++ String Manipulation


C++ assign() function

The assign() function is used to assign all characters of a string to another string or just part of a string to another string. Normally, you can assign one string to another by using assignment operator(=). However, if you want to assign a proportion of a string to another string you need to you the assign() function instead. The assign() function has two forms. The first form is to assign all characters from a string to another and the second form assigns part of a string to another string.

assign(string);

assign(string, start, num_chars);

The second form of the assign() function accepts three arguments. The first argument is a string that you want to cut part of it and the start argument indicates where you want to start cutting. The num_chars argument is about the number of characters that you want to cut.


Example:

#include <cstdlib>
#include <iostream>
#include <conio.h>


using namespace std;


void strmanip(){

  string str1;
  string str2="C++ programming code";
  str1.assign(str2);//assign entire string str2 to another string str1
  cout<<str1<<endl;
  str1.assign(str2,4,11);//assign part of string str 2 to another string str1
  cout<<str1<<endl;

}

int main(){

  strmanip();
  getch();
  return 0;

}


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