When used on a global variable, it limits visibility to that file only (internal linkage). This is essential for encapsulation. Extern: Tells the compiler the variable exists elsewhere.
Function parameters have block scope and no linkage . A static local variable has no linkage but static storage duration —it persists across function calls but cannot be accessed by name outside. expert c programming deep c secrets
sizeof(struct) may be larger than the sum of member sizes. When used on a global variable, it limits