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how to pass a string by reference in c++

By Your FriendYour Friend on Jan 06, 2021
#include <iostream>
using namespace std;
void func (string &s)
{
  s+="d";
}
int main()
{
  string a="abc";
 	func(a);
  cout << a << endl;
  return 0;
}
// output will be abcd

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1

passing reference in c++

By Cheerful CamelCheerful Camel on Jun 01, 2020
// C++ program to demonstrate differences between pointer 
// and reference. 
#include <iostream> 
using namespace std; 
  
struct demo 
{ 
    int a; 
}; 
  
int main() 
{ 
    int x = 5; 
    int y = 6; 
    demo d; 
      
    int *p; 
    p =  &x; 
    p = &y;                     // 1. Pointer reintialization allowed 
    int &r = x; 
    // &r = y;                  // 1. Compile Error 
    r = y;                      // 1. x value becomes 6 
      
    p = NULL;            
    // &r = NULL;               // 2. Compile Error 
      
    p++;                        // 3. Points to next memory location 
    r++;                        // 3. x values becomes 7 
      
    cout << &p << " " << &x << endl;    // 4. Different address 
    cout << &r << " " << &x << endl;    // 4. Same address 
      
    demo *q = &d; 
    demo &qq = d; 
      
    q->a = 8; 
    // q.a = 8;                 // 5. Compile Error  
    qq.a = 8; 
    // qq->a = 8;               // 5. Compile Error 
      
    cout << p << endl;        // 6. Prints the address 
    cout << r << endl;        // 6. Print the value of x     
  
    return 0; 
} 

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3

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