Question

Are the sizes and statements for the entire array stated in the comments in the code below correct?

//gArray uses sizeof(char)*100 = 1*100 = 100 bytes.
char gArray[100];

//gArray uses sizeof(char)*100*50 = 1*100*50 = 5000 bytes.
char gArray[100][50];

//gArray is a 2D array, each element is a pointer to a char (although
//char data type is irrelevant).
//gArray uses sizeof(void*)*100*50 = (4 or 8) * 100 * 50 = 20000 or 40000 bytes.
char* gArray[100][50];

Thanks.

Answer 1

You just print out the values:

char gArray1[100];

char gArray2[100][50];

char* gArray3[100][50];

std::cout << "gArray1  " << sizeof(gArray1) << "\n"
          << "gArray2  " << sizeof(gArray2) << "\n"
          << "gArray3  " << sizeof(gArray3) << "\n";

I get:

gArray1  100
gArray2  5000
gArray3  40000