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iOS Objective-C Basics (Retired) Pointers and Memory Array Size and Length

Posted by mikema
mikema
1,678 Points

Using the printf function print the size in bytes of the variable real_numbers. Your output should look like the followi

here is my code, i dont see any thing wrong with it but it just keep telling me that's incorrect...

float real_numbers[5]; printf ("Array real_numbers is ld% bytes.\n",sizeof(real_numbers));

3 Answers

Stone Preston
Stone Preston
42,016 Points
Stone Preston
Stone Preston
42,016 Points 
printf ("Array real_numbers is ld% bytes.\n",sizeof(real_numbers));

your format specifier is incorrect. Its %ld not ld%

mikema
mikema
1,678 Points

thanks a lot...didn't notice that...may i ask one more question, why %ld?when do we use %ld

Stone Preston
Stone Preston
42,016 Points
Stone Preston
Stone Preston
42,016 Points

Mike Ma the sizeof() function returns a long integer. since it returns a long integer you need to use the format specifier for long integer which is %ld

Dustin Mote
Dustin Mote
3,590 Points
Dustin Mote
Dustin Mote
3,590 Points

printf("Array real_numbers is %ld bytes\n", sizeof(real_numbers)*sizeof(float)); is still not working for me

Edwin Rivera
Edwin Rivera
924 Points
Edwin Rivera
Edwin Rivera
924 Points

Future advice to anyone, I over thought the answer when it was just asking for the float array and the printf statement with the sizeof(real_numbers) only.

Good luck :D