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What does a declared but uninitialized variable store? [duplicate]

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Questions › What does a declared but uninitialized variable store? [duplicate]
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Garmaine asked 4 years ago
This question already has answers here:
http://stackoverflow.com//questions/40987901/what-happens-to-uninitialized-variables-c”>What happens to uninitialized variables? C++ (3 answers)
http://stackoverflow.com//questions/30172416/uninitialized-variable-behaviour-in-c”>Uninitialized variable behaviour in C++ (4 answers)
http://stackoverflow.com//questions/6032638/default-variable-value”>Default variable value (8 answers)
Closed 12 hours ago.

For example, if I have:

int num;
double num2;
int* ptr;

Are these variables just randomly allocated some memory?