Question

How to set char pointer to string in C++

Answer 1

#include <iostream>
   
using namespace std;
   
int main() {
    string s = "c c++ java php"; 
  
    const char *p = s.c_str();
      
    s[0] = 'W';
     
    // p[1] = 'Q'; // error: assignment of read-only
    // *(p + 1) = 'Q'; // error: assignment of read-only
       
    for (int i = 0; i < s.length(); i++) { 
        cout << p[i] << endl;
    } 
}
   
   
   
/*
run:
   
W
  
c
+
+
  
j
a
v
a
  
p
h
p
   
*/

 

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Answer 2

#include <iostream>
  
using namespace std;
  
int main() {
    string s = "c c++ java php"; 
 
    char *p = &s[0];
     
    s[0] = 'R';
    
    p[1] = 'Q'; 
    *(p + 2) = 'Z'; 
      
    for (int i = 0; i < s.length(); i++) { 
        cout << p[i] << endl;
    } 
}
  
  
  
/*
run:
  
R
Q
Z
+
+
 
j
a
v
a
 
p
h
p
  
*/

 

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