C语言程序设计教程（第三版）课后习题9.8 （C语言代码）

#include<stdio.h>
#include<math.h>
#define maxabc(m,n,p)      (m>n?m:n)>p?(m>n?m:n):p
                           
int main()
{
    float a,b,c,max1;
    scanf("%f %f %f",&a,&b,&c);
    max1 = fmaxf(fmaxf(a,b),c);
    printf("%.3f\n",max1);
    printf("%.3f",maxabc(a,b,c));
    return 0;
}

#include<stdio.h>
#define maxNum1(a,b,c) (a>b?(a>c?a:c):(b>c?b:c))

float maxNum2(float a,float b,float c);

int main()
{
    float a,b,c;
    scanf("%f %f %f",&a,&b,&c);
    printf("%.3f\n%.3f\n",maxNum2(a,b,c),maxNum1(a,b,c));
    return 0;
}

float maxNum2(float a,float b,float c){
    return (a>b?(a>c?a:c):(b>c?b:c));
}

#include<stdio.h>
double max(double x,double y,double z);
#define MAX(x,y) x>y ? x:y    //如果x>y,那么MAX(x,y)的值就是x，否则就是y

int main()
{
    double a,b,c,maxi,maxj;
    scanf("%lf %lf %lf",&a,&b,&c);             
    max(a,b,c);                   //依次比较
 //   printf("%.3lf",maxj);    
    return 0;
}
double max(double a,double b,double c)
{
double maxa,maxb;
    maxa=MAX(a,b);
    maxb=MAX(maxa,c);
    printf("%.3lf",maxb);  
    //return maxa;
}

#include<stdio.h>
#define MAX(a,b,c) max1=a,((max1<b?:max1=b)>c?:max1=c);
int main()
{
	double max2(double a,double b,double c);
	double a,b,c,max1;
	scanf("%lf%lf%lf",&a,&b,&c);
	max2(a,b,c);
	MAX(a,b,c);
	printf("%.3lf\n",max1);
}
double max2(double a,double b,double c)
{
	double max=a;
	if(max<b)
	{
		max=b;
	}
	if(max<c)
	{
		max=c;
	}
	printf("%.3lf\n",max);
	return 0;
}
哪里错误了呢，这个典型的问题有助于提高大家C语言编程能力

x>y? x : y为条件表达式，若x>y成立则这个表达式的值为后面x,否则表达式的值是y,
z?(x>y?x:y):z     这个是什么东西

#define ZUI_DA(a,b,c) a>b?(a>c?a:c):(b>c?b:c)
float Zui_Da(float a, float b, float c)
{
	if (a < b)
	{
		a = b;
	}
	
	if (a < c)
	{
		return c;
	}
	else
		return a;
}
int main()
{
	float a, b, c;
	scanf("%f%f%f", &a, &b, &c);
	printf("%.3f\n",Zui_Da(a, b, c));
	printf("%.3f\n", ZUI_DA(a,b,c));
	return 0;
}

#include<stdio.h>
#define MAX(x,y,z) (x>y?x:y)>z?(x>y?x:y):z

double max(double x,double y,double z)
{
	return (x>y?x:y)>z?(x>y?x:y):z;
}

int main()
{
	double x,y,z,max1,max2;
	scanf("%1f %1f %1f",&x,&y,&z);
	max1 = max(x,y,z);
	max2 = MAX(x,y,z);
	printf("%.3f\n%.3f\n",max1,max2);
	return 0;
}

是这个，不是上面的

#include<stdio.h>
#define MAX(x,y,z) (x>y?x:y)>z?(x>y?x:y):z
 
double max(double x,double y,double z)
{
    return (x>y?x:y)>z?(x>y?x:y):z;
}
 
int main()
{
    double x,y,z,max1,max2;
    scanf("%lf%lf%lf",&x,&y,&z);
    max1 = MAX(x,y,z);
    max2 = max(x,y,z);
    printf("%.3lf\n%.3lf\n",max1,max2);
    return 0;
}
这个为什么错了？求大佬解答