Is this the right way to create a 20 integer array in C++?

Question

I need to make an array with at least 20 integers that will be searched with the linear and the binary search algorithms. Is this array right?

const int NUM_INTEGERS = 20;
int integer[NUM_INTEGERS];

integer[NUM_INTEGERS][0] = 45
integer[NUM_INTEGERS][1] = 63
integer[NUM_INTEGERS][2] = 12
integer[NUM_INTEGERS][3] = 21
integer[NUM_INTEGERS][4] = 90
integer[NUM_INTEGERS][5] = 79
integer[NUM_INTEGERS][6] = 43
integer[NUM_INTEGERS][7] = 56
integer[NUM_INTEGERS][8] = 29
integer[NUM_INTEGERS][9] = 44
integer[NUM_INTEGERS][10] = 52
integer[NUM_INTEGERS][11] = 37
integer[NUM_INTEGERS][12] = 109
integer[NUM_INTEGERS][13] = 9
integer[NUM_INTEGERS][14] = 85
integer[NUM_INTEGERS][15] = 123
integer[NUM_INTEGERS][16] = 14
integer[NUM_INTEGERS][17] = 60
integer[NUM_INTEGERS][18] = 99
integer[NUM_INTEGERS][19] = 101

Answer 1

It's close, but these lines:



integer[NUM_INTEGERS][0] = 45



should look like this:



integer[0] = 45;



integer is a single dimension array, so you only need [0] to access an element. Also needed the ; at the end of the line.

Answer 2

You can also assign values to arrays this way



const int NUM_INTEGERS = 20;

int integer[NUM_INTEGERS] = {45, 63, 12, 21, 90, 79, 43, 56, 29 , 44, 52, 37, 109, 9 , 85, 123, 14, 60, 99, 101};



The above code is same as

integer[0] = 45;

integer[1] = 63;

integer = 12;

:

:

:

integer[17] = 60;

integer[18] = 99;

integer[19] = 101;



You made just 2 mistakes

1. forgetting ";" after initializing values (remember every statement in C or C++ needs semicolon at end, initializing a variable or array is also a statement of C/C++)

2. It's a one dimensional array so you need only one subscript not 2 like "integer[0]" and not this "integer[NUM_INTEGERS][0]"

Answer 3

Kid, grab your textbook and read up about the preprocessor or look it up on line. The preprocessor will read you code snippet and replace all those array things with:



integer[20][1]=...integer[20][19]=101;



If it even COMPILES you are going to get a crash because there is NO integer[20] [ANY NUMBER]! Get that first set of brackets OUT of there. What has your computer done to you that you would torture it so? Never mind.

Answer 4

Not quite, you have declared a one-dimensional array

http://xoax.net/comp/cpp/console/Lesson10.php



not a two dimensional array:

http://xoax.net/comp/cpp/console/Lesson28.php



Here are some examples of array syntax:

http://xoax.net/comp/cpp/reference/arrays.php



Also, you need to sort the array before you can perform a binary search. This should help you:

http://xoax.net/comp/cpp/console/Lesson20.php