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Initialization can be explicit or default. Explicit initialization means assigning a value when the variable is defined. Default initialization occurs when a variable is defined outside any function without an explicit initializer, and the compiler automatically sets it to zero (for static and global variables). Explicit initialization: int cou ...

Variable scope is categorized into two types: global scope and block scope. A name has global scope when the nearest opening brace preceding its first occurrence is a closing brace ('}'). Such names are accessible throughout the entire program. A name has block scope when the nearest opening brace preceding its first occurrence is an opening br ...

When a variable is defined without an initializer (e.g., int i;), the system may implicitly initialize it. Whether the system performs this implicit initialization and the value it assigns depend on both the type of the variable and where it is defined. 1. Initialization of Built-in Type Variables Weather a built-in variable is automatically in ...