C++ Programming MCQ Test 3: Question 2

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What will be the output of the following C++ code snippet ?

#include <iostream> 
using namespace std; 

int main() {
    register int i = 1;
    int *ptr = &i;
    cout << *ptr;
    return 0;
}

A) 0

B) 1

C) Compiler error

D) Runtime error

sec

Please first select an option.

The correct answer is C) Compiler error

The register keyword is used to suggest to the compiler to store the variable i in a register for faster access. However, the register keyword is merely a suggestion to the compiler, and the compiler can choose to ignore it if it deems necessary. Using & on a register variable may be incorrect because the compiler may place the variable in a register and determining its address is unlawful.

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