《C语言第三版课后习题》10课后习题9.4给年份year，定义一个宏，以判别该年份是否闰年。#include<stdio.h> #define LEAP_YEAR(y) (y%4==0 && y%100!=0) || (y%400==0)?'L':'N'int main(){ int y; scanf("%d",&y); int l=LEAP_YEAR(y); printf("%c",l); return 0;}课后习题9.6请设计输出实数的格式，包括：⑴一行输出一个实数；⑵一行内输出两个实数；⑶一行内输出三个实数。实数用"6.2f"格式输出。使用宏定义#include<stdio.h> #define pr1(x) printf("%.2f\n",x) #define pr2(x) printf("%6.2f\t%6.2f\n",x,x) #define pr3(x) printf("%6.2f\t%6.2f\t%6.2f\n",x,x,x) int main(){ float x; scanf("%f",&x); pr1(x); pr2(x); pr3(x); return 0;}课后习题9.8分别用函数和带参的宏，从三个数中找出最大的数。#include<stdio.h>#define max(a,b,c) a>=(b>=c?b:c)?a:(b>=c?b:c)int main() { float m(float a,float b,float c); float t1,t2,a,b,c; scanf("%f %f %f",&a,&b,&c); t1=max(a,b,c); printf("%.3f\n",t1); t2=m(a,b,c); printf("%.3f",t2); return 0;}float m(float a,float b,float c) { float x; x=(a>=(b>=c?b:c)?a:(b>=c?b:c)); return (x);}