Скачать или смотреть C Programming Interview Questions: Part 1. Const, Volatile, Static, and Infinite Loops in Embedded C

Embedded C Programming Interview Questions: Part 1
Const, Volatile, Static, and Infinite Loops in Embedded C

• const vs #define:
const defines typed constants stored in memory, while #define is a preprocessor macro without a data type or memory allocation.

• volatile keyword:
Informs the compiler that a variable may change at any time, preventing optimization. Often used with hardware registers or ISR-shared variables.

• static keyword:
Used to retain a variable’s value across function calls or to limit global variable access to a single file.

• Infinite Loops – while(1) vs for(;;):
Both create endless loops. while(1) is more readable, while for(;;) can be marginally more efficient in some compilers.

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