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C++ | const keyword | Question 1

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Predict the output of following program
#include <iostream>
using namespace std;
int main()
{
    const char* p = "12345";
    const char **q = &p;
    *q = "abcde";
    const char *s = ++p;
    p = "XYZWVU";
    cout << *++s;
    return 0;
}

                    
(A) Compiler Error (B) c (C) b (D) Garbage Value

Answer: (B)

Explanation: Output is ‘c’ const char* p = “12345″ declares a pointer to a constant. So we can’t assign something else to *p, but we can assign new value to p. const char **q = &p; declares a pointer to a pointer. We can’t assign something else to **q, but we can assign new values to q and *q. *q = “abcde”; changes p to point to “abcde” const char *s = ++p; assigns address of literal ”bcde” to s. Again *s can’t be assigned a new value, but s can be changed. The statement printf(“%cn”, *++s) changes s to “cde” and first character at s is printed.

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Last Updated : 28 Jun, 2021
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