If you fail to initialize a loop control variable, C++ will automatically assign a value of 0 to the variable.

Name: If you fail to initialize a loop control variable, C++ will automatically assign a value of 0 to the variable.
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In C++, if you fail to initialize a loop control variable (or any variable), it will have an indeterminate value (not automatically initialized to 0) unless it is a static variable, which then gets initialized to 0.

If You Fail to Initialize a Loop Control Variable, C