C language: question and answer

Que. What is the output of:

#include<stdio.h>

int main()

{

    int x=40;

    {

        int x=20;

        printf("%d",x);

    }

    printf("%d",x);

    return 0;

}




Options:

a 40 40

b 20 40

c 40 20

d error










Answer:




b 20 40




Explainaition:




The variable declared inside the  inner block replaces the x declared in the outer block, hence it prints 20 at 1st printf.

When the inner block ends, the scope of inner x also ends and hence the value of x becomes 40 in the outer block.