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The 3rd PPT in this unit lists this example program when explaining the issue of uninitialized variables in C/C++

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The 3rd PPT in this unit lists this example program when explaining the issue of uninitialized variables in C/C++. In theory the program should return a junk value due to the uninitialized local variable a in adder(). However, it will return 42. Why is that?

int adder() {
   int a;
   return a + 2;
}
int assign() {
   int y = 40;
   return y;
}
int main() {
   int x;
   assign();
   x = adder();
   return x;
}