Programming Forums > Application Development > C++

81k5blzr · Mar 21st, 2005, 9:30 AM

Here are a couple of questions I have about arrays?
First of all can I subscript an array using (char, float, or short)?

My next question is about two dimensional arrays. I have the following initialization:
int a[][4] = {{1,2,3,4z},{5,6,7,8}};
Could somebody explain how I get the value for the expression: *(a[1]+2).

I know these are basic questions but I am having a problem grasping c. So any help is greatly appreciated.

java_roshan · Apr 21st, 2005, 12:53 PM

An array cannot have float or char as its subscript. I am not sure about short. However, I will try to find out and answer.

For the second question I need to go through the material (I dont remember things ......I forget a lot)
....

iignotus · Apr 21st, 2005, 6:28 PM

>>First of all can I subscript an array using (char, float, or short)?
Any positive integer (long int, short int, unsigned int, int, etc) should work to subscript the array.

>>int a[][4] = {{1,2,3,4z},{5,6,7,8}};
Should be, as far as I know, int a[2][4] = {{1,2,3,4},{5,6,7,8}}; No z.

>>Could somebody explain how I get the value for the expression: *(a[1]+2).
I'm taking that * as a multiplication, and that by a[1] you want the number 2 (remember, arrays script from [0], not [1]; [0] is the first element). Also, you need to specify a subscript for the first array as well as the last in a 2-d array.

Example:
int x = 10;
int y = a[0][1]; // should be the number 2
int z = x+(y+2); // should be what you're looking for: 14

Also:
int x = 10;
int z = (x+((a[0][1])+2); // z should equal 14 here, too

Now, I'm not 100% sure

but this seems the way to go. Unforunately, even my array work is rusty. Hope this helps.

bl00dninja · Apr 30th, 2005, 7:14 PM

and nothing more from that "member"

Mar 21st, 2005, 9:30 AM	#1
81k5blzr Newbie Join Date: Mar 2005 Posts: 1 Rep Power: 0	array help Here are a couple of questions I have about arrays? First of all can I subscript an array using (char, float, or short)? My next question is about two dimensional arrays. I have the following initialization: int a[][4] = {{1,2,3,4z},{5,6,7,8}}; Could somebody explain how I get the value for the expression: *(a[1]+2). I know these are basic questions but I am having a problem grasping c. So any help is greatly appreciated.

Apr 21st, 2005, 12:53 PM	#2
java_roshan Professional Programmer Join Date: Mar 2005 Location: Student of University of Mumbai, Maharashtra State, India Posts: 344 Rep Power: 4	An array cannot have float or char as its subscript. I am not sure about short. However, I will try to find out and answer. For the second question I need to go through the material (I dont remember things ......I forget a lot) .... __________________ Visit: http://www.somaiya.edu

Apr 21st, 2005, 6:28 PM	#3
iignotus Professional Programmer Join Date: Apr 2005 Location: Nowhere Special Posts: 466 Rep Power: 4	>>First of all can I subscript an array using (char, float, or short)? Any positive integer (long int, short int, unsigned int, int, etc) should work to subscript the array. >>int a[][4] = {{1,2,3,4z},{5,6,7,8}}; Should be, as far as I know, int a[2][4] = {{1,2,3,4},{5,6,7,8}}; No z. >>Could somebody explain how I get the value for the expression: (a[1]+2). I'm taking that as a multiplication, and that by a[1] you want the number 2 (remember, arrays script from [0], not [1]; [0] is the first element). Also, you need to specify a subscript for the first array as well as the last in a 2-d array. Example: int x = 10; int y = a[0][1]; // should be the number 2 int z = x+(y+2); // should be what you're looking for: 14 Also: int x = 10; int z = (x+((a[0][1])+2); // z should equal 14 here, too Now, I'm not 100% sure but this seems the way to go. Unforunately, even my array work is rusty. Hope this helps. __________________ (Toggle Plain Text) % rc4 hexkey < input > output #define S ,t=s[i],s[i]=s[j],s[j]=t /* rc4 hexkey <file / unsigned char k[256],s[256],i,j,t;main(c,v,e)charv;{++v;while(++i)s[ i]=i;for(c=0;(v)++;k[c++]=e)sscanf((v)++-1,"%2x",&e);while(j+=s[i] +k[i%c]S,++i);for(j=0;c=~getchar();putchar(~c^s[t+=s[i]]))j+=s[++i]S;} Last edited by iignotus; Apr 21st, 2005 at 6:29 PM. Reason: clarity

Apr 30th, 2005, 7:14 PM	#4
bl00dninja Programming Guru Join Date: Oct 2004 Location: namespace std Posts: 1,246 Rep Power: 5	and nothing more from that "member" __________________ i put on my robe and wizard hat... Have you ever heard of Plato, Aristotle, Socrates?...Morons.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Programming Forums > Application Development > C++

array help