C语言宏定义 #

#define PI 3.14159
#define MAX_SIZE 100
#define NEWLINE '\n'

#include <stdio.h>

#define PI 3.14159

int main() {
    double area = PI * 5 * 5;
    printf("面积: %.2f\n", area);
    return 0;
}

#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define SQUARE(x) ((x) * (x))

#include <stdio.h>

#define MAX(a, b) ((a) > (b) ? (a) : (b))

int main() {
    printf("最大值: %d\n", MAX(10, 20));
    return 0;
}

#define SQUARE(x) x * x

int result = SQUARE(1 + 2);

#define SQUARE(x) ((x) * (x))

#define SWAP(a, b, type) \
    do { \
        type temp = a; \
        a = b; \
        b = temp; \
    } while (0)