Hello i have decided to start a thread to teach basic C and C++!
i suggest going here and downloading CodeBlocks as it compiles C and C++ files making it loads easier for you:
http://www.codeblocks.org/downloads/26
•Windows 2000/XP/Vista/7
•Linux 32-bit
•Linux 64-bit
•Mac OS X
^^ These are the supported platforms for CodeBlocks!
if somebody wants something a little more advance there will be more advanced C tutorials later on C++ maybe that gets a bit more diffucult
But onto the first tutorial:
Firstly, you'll need CodeBlocks open and click File, New project, Empty Project and go through the PopUp screens till your to your blank typing canvas
im going to post a block of code and dissect and explain it to you so you get C easily The Anatomy of a C Program:
- Code: Select all
/* Volume.C: Calculate sphere's volume. */
#include <stdio.h>
#define PI 3.14
float sphere( int rad );
int main()
{
float volume;
int radius = 3;
volume = sphere( radius );
printf( "Volume: %f\n", volume );
}
float sphere( int rad )
{
float result;
result = rad * rad * rad;
result = 4 * PI * result;
result = result / 3;
return result;
}
Starting with the first line at the top of the code:
1.) This is a Comment just like the comment's in GE except you use /* to begin a comment & */ to end a comment.
2.) This include's C libray Function files so C can use them this particular one is for Input and Output (typing something in and getting a response).
3.) #define used the same as in GE to define a variable it's for defining constants in this example PI = 3.14 and we dont want it to change so we define it.
4.) is a C prototype sounds big but all it does is tells C the sphere function returns a float value and requires one integer argument.
5.) This ones easy main() in every C program is where the program starts to read at every C program has a main() in it.
6.) Declares that volume is a float.
7.) Declares that radius is an integer (int) and intialize's it to 3 or in other words.. The integer Radius equals 3.
8.) Initialize's volume to equal sphere's return result.
9.) is like GE's sprintf() function printf("anything you want to type: %f\n", integer or float or so on type of value) the %f\n means it prints the called for value the little f is for a float value little i would be for a integer.
10.) This is sphere's own function so it can do the math to determine the sphere's volume.
11.) just like 6 declares that result is a float value.
12.) just like 7 initializes that result = rad multiplied by rad multiplied by rad.
13.) these next 3 lines are a bit more interesting. but this line takes the previous result from line 12 and multiplys it by 4 and PI.
14.) line 14 takes the result from line 13 and divides it by 3.
15.) and finally line 15 returns the summed up result from line 12 to 14 to the sphere function line 10 which is where line 8 assigns this result to volume and line 9 prints this result on the screen.
whew that was long
i hope this helps people a C++ tutorial will come later hope your ready
{EDIT: i did forget to say that to compile and run your code press the blue arrow under the edit tab}
