Web Reference: Oct 17, 2025 · It is important to initialize a variable because a C variable only contains garbage value when it is declared. We can also initialize a variable along with declaration. Note: It is compulsory that the values assigned to the variables should be of the same data type as specified in the declaration. Variable declaration reserves memory, initialization assigns initial values during declaration, and assignment gives values to already declared variables. Understanding these concepts is fundamental for effective C programming and memory management. As for member variables, you should initialize them in the constructor of your class. For pointers, always initialize them to some default, particularly NULL, even if they are to be used later, they are dangerous when uninitialized.
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