INTERVIEW QUESTIONS C ARRAYS IN C DETAILS

Question: Can the sizeof operator be used to tell the size of an array passed to a function?

Answer: No. There’s no way to tell, at runtime, how many elements are in an array parameter just by looking at the array parameter itself. Remember, passing an array to a function is exactly the same as passing a pointer to the first element.

No. There’s no way to tell, at runtime, how many elements are in an array parameter just by looking at the array parameter itself. Remember, passing an array to a function is exactly the same as passing a pointer to the first element. Source: CoolInterview.com

YES.You can tell how large the array is. However, you cannot determine how many elements have been copied into it so far.

EX: Take for instance the following code.

int testList[5];
int sizeofList = sizeof(testList);
printf("sizeof list = %d", sizeofList);

The output will be: "sizeof list = 20"
Meaning that 4(int) * 5 = 20. Source: CoolInterview.com

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