C Programming/Constants: Difference between revisions
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| Line 29: | Line 29: | ||
int main() | int main() | ||
{ | { | ||
const int LENGTH = 10; | const int LENGTH = 10; | ||
const int WIDTH = 5; | const int WIDTH = 5; | ||
const char NEWLINE = '\n'; | const char NEWLINE = '\n'; | ||
int area; | int area; | ||
| Line 37: | Line 37: | ||
printf("Value of Area : %d", area); | printf("Value of Area : %d", area); | ||
printf("%c", NEWLINE); | printf("%c", NEWLINE); | ||
return 0; | return 0; | ||
} | } | ||
</syntaxhighlight> | </syntaxhighlight> | ||
Revision as of 05:01, 5 February 2018
There are two simple ways in C to define constants:
- Using
#definepreprocessor. - Using
constkeyword.
The #define Preprocessor
//main.c
#include <stdio.h>
#define LENGTH 10
#define WIDTH 5
#define NEWLINE '\n'
int main()
{
int area;
area = LENGTH * WIDTH;
printf("value of area : %d", area);
printf("%c", NEWLINE);
return 0;
}
The const Keyword
//main.c
#include <stdio.h>
int main()
{
const int LENGTH = 10;
const int WIDTH = 5;
const char NEWLINE = '\n';
int area;
area = LENGTH * WIDTH;
printf("Value of Area : %d", area);
printf("%c", NEWLINE);
return 0;
}