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Laurence Bowe
6,222 PointsCode challenge: Array length
Hi, this is my code and the question is: Print the length of the array real_numbers using the sizeof() function. Your output should look like the following: Array real_numbers can store x items. And I have no idea where I went wrong! P.S it says Bummer! That was not the correct string. Do you have the correct format character? sizeof(real_numbers) returns a long. That format character is '%ld'.
any help will be much appreciated!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
float real_numbers[] = {1.11,1.22,1.33,1.44,1.55}; printf("Array real_numbers is %ld bytes.\n",sizeof(real_numbers)); printf("Array real_numbers can store %ld items.",sizeof(real_numbers));
6 Answers
Gary Luce
7,153 PointsTry swapping %ld for %f I'd say?
Liam Herbert
15,140 PointsHi I have a similar issue. I have written your code into Xcode and it compiles successfully, but then on the treehouse iPad app it says "Somethings not right. Make sure array is defined and of type float."
Laurence Bowe
6,222 PointsI know SO frustrating!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Laurence Stokes
6,109 Pointsfloat real_numbers[5]; //we didn't have to explicitly set values!
printf("Array real_numbers is %ld bytes.\n", sizeof(real_numbers)); //gets the size of real_numbers array in bytes (which is going to be 5 * 4 as float values are 4 bytes of memory each)
printf("Array real_numbers can store %ld items.\n", sizeof(real_numbers)/sizeof(float)); //extracting the number of float items your real_numbers array can store!
I think mine worked like thus, however:
printf("Array real_numbers can store %ld items.\n", sizeof(real_numbers)/4);
Though this would be explicitly stating the size of a float variable (which I knew to be 4). The solution I posted up is more elegant.
Laurence Bowe
6,222 PointsTHANKS HEAPS!!!!!!!!!!!!!!!!!!!!!!!! P.S WE BOTH HAVE THE SAME NAME!!!!!!!!!!!! AWESOME!!!!!:)
Laurence Stokes
6,109 PointsNo worries, I'm glad I could help! And hi-five! Most Laurences/Lawrences I know are spelt with a w too!
Laurence Bowe
6,222 PointsLaurence Bowe
6,222 Pointsdat didn't work:( though thanks heaps anyway!!!:)