. #define , , , . , , .
#include <stdio.h>
#define A 3
int main()
{
printf("%d + %d = %d", A, A, A+A); // 3 + 3 = 6
getchar();
return 0;
}
. :
U u (unsigned);
F ( f) float;
L/span> ( l) 8 (long int);
L/span> ( l) long double
#define A 280U // unsigned int
#define B 280LU // unsigned long int
#define C 280 // int (long int)
#define D 280L // long int
#define K 28.0 // double
#define L 28.0F // float
#define M 28.0L // long double
, , . , .
( 1,..., n)
, .
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define PI 3.14159265
#define SIN(x) sin(PI*x/180)
int main()
{
int c;
system("chcp 1251");
system("cls");
printf(" : ");
scanf("%d", &c);
printf("sin(%d)=%lf", c, SIN(c));
getchar(); getchar();
return 0;
}
, . , , . 1 , , .
#undef.
,
#include <stdio.h>
#define sum(A,B) A+B
int main(){
int a,b,c,d;
a=3; b=5;
c = (a + b)*2; // c = (a + b)*2
d = sum(a, b) * 2; // d = a + b*2;
printf(" a = %d\n b = %d\n", a, b);
printf(" c = %d \n d = %d \n", c, d);
getchar();
return 0;
}
:
#if #ifdef/#ifndef #elif, #else #endif . #if , , #if. :
