C Tutorial/Preprocessor/define
Use #define to define constant
<source lang="cpp">#include <stdio.h>
- define TRUE 1
- define FALSE 0
- define BS "\b"
- define TAB "\011"
main(){
printf("%d",TRUE);
printf("%d",FALSE);
printf("%c",BS);
printf("%d",TAB);
}</source>
19
Use preprocessor to define integer and string
<source lang="cpp">#include <stdio.h>
- define VAL 35
- define HELLO "HELLO"
main () {
int res;
res = VAL-5;
printf ("res = VAL-5: res == %d\n", res);
printf ("%s",HELLO);
}</source>
res = VAL-5: res == 30
HELLO
