Macros: define

Good for maintainability...

/* Programme to illustrate use of macros --- conversion of Fahrenheit to Centigrade/Celsius : */ #define LOWER 0 /* lower limit of table */ #define UPPER 300 /* upper limit */ #define STEP 20 /* step size */ /* print table : */ main () { int fahr; for (fahr = LOWER; fahr <= UPPER; fahr = fahr + STEP) printf("%3d %6.1f\n", fahr, (5.0/9.0)*(fahr - 32)); }