i need a good tutorial about macros
what i know until now is that we
but i dont know how to return to the main the codeCode:#define oneword
also i think we can use ## to merge numbers and words (i have tried to use ## to merge 2 variables in main but it didn't work ,looks like it works only with macros )
Hello. Do you want to learn how macros work?Originally Posted by cable
Macros are text substitution. They just submit one block of text for another:When that compiles, the preprocessor turns the code into:Code:#define DOG 1 printf( "the macro DOG is the value %d\n", DOG );Code:printf( "the macro DOG is the value %d\n", 1 );Let me google that for you
Quzah.
Hope is the first step on the road to disappointment.
One simple example from me.
with the preprocessor command #define you will substitute the N and T with the values 4 and 0 respectively.Code:#include<stdio.h> #define N 4 // define size of the array below which equals 4 #define T 0 // define Termination which equals 0 int main() { int x[N]={1,2,3,4}; int i=0; for(; i<N; i++) printf("The elements of array are : %d ", x[i]); return T; }
The purpose that someone do this is to reuse the N & T in many points into the code.
This example supports and contains only the basic "function" of the preprocessor command #define .
Mr. Lnx
Last edited by Mr.Lnx; 09-16-2011 at 04:13 PM.
What are your error messages? Post the complete error message exactly as it appears in your development environment.
Also can you explain what you think the last two lines in this snippet are doing?
JimCode:const int SIZE = 5; int runtime_error = 0; int main(void) { extern const int SIZE; extern int runtime_error;
problem solved
Last edited by cable; 09-17-2011 at 07:15 AM.
