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C Programming - Declarations and Initializations

Exercise : Declarations and Initializations - Find Output of Program
11.
In the following program how long will the for loop get executed? 
#include<stdio.h>
int main()
{
    int i=5;
    for(;scanf("%s", &i); printf("%d\n", i));
    return 0;
}
The for loop would not get executed at all
The for loop would get executed only once
The for loop would get executed 5 times
The for loop would get executed infinite times
Answer: Option
Explanation:

During the for loop execution scanf() ask input and then printf() prints that given input. This process will be continued repeatedly because, scanf() returns the number of input given, the condition is always true(user gives a input means it reurns '1').

Hence this for loop would get executed infinite times.

12.
What will be the output of the program? 
#include<stdio.h>
int main()
{
    int X=40;
    {
        int X=20;
        printf("%d ", X);
    }
    printf("%d\n", X);
    return 0;
}
40 40
20 40
20
Error
Answer: Option
Explanation:
In case of a conflict between a local variable and global variable, the local variable gets priority.
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