Question

What will be the output of the following?

#include

int main()

{

int a = 5;

scanf("%d",a);

return 0;

}

1. A
2. 0
3. Abnormal termination of program
4. 5

Answer 1

Correct Answer - Option 3 : Abnormal termination of program

Scanf:

• In C, the scanf feature allows a programmer to accept input from a standard input device (keyboard) and store it in variables.
• The scanf function is very similar to the printf function.
• It reads data from the input device rather than printing it on the output device.
• Each variable must be preceded by the ampersand (&) address-of operator in scanf function.

Example:

1) int a;

   scanf (" %d ", &a);

This will take the integer value and assign it to a, (No error).

2) int a;

   scanf (" %d ", a);

It will gave "Segmentation fault" 

It means accessing an invalid memory location, result in abnormal termination of the program.

Hence the option (3) is correct.