Is this undefined behavior? why does this code return a seemingly random integer?-CodePudding

I'm looking at the following C code:

#include <stdio.h>
#include <stdlib.h>

void main(){
    int a;
    printf("%d", a);

}

I'm wondering why this code prints a seemingly random number. My first guess is that this is undefined behavior but I could be wrong.

CodePudding user response：

because you didn't assigned any value to a, so this is giving garbage value every time you run code.

CodePudding user response：

Yes, it is undefined behavior.

This question seems to be a duplicate of Reading uninitialized variable