谁帮看下这2个程序错在哪?帮说明下原因~

谁帮看下这2个程序错在哪?帮说明下原因~
#include
void main()
{
int a,b,c;
scanf("%d,%d",&a,&b);
c=max(a,b);
printf("max=%d",c);
return;
}
int max(int x,int y);
{
int z;
if (x>y) z=x;
else z=y;
return(z);
错误C:\Tornado\target\proj\Project1\rr.c 1 Error 322:Unable to open include file 'stdio.h'
C:\Tornado\target\proj\Project1\rr.c:11:parse error before `int'
请问这是为什么?
输入a,b,c值,输出其中最大者
#include
void main()
{
int a,b,c,d;
scanf("%d,%d,%d",&a,&b,&c);
d=max(a,b,c);
printf("max=%d",d);
return;
}
int max(int x,int y,int z);
{
int i;
if (x>y>z) i=x;
else i=y;
else i=z
return(i);
}
错误C:\Tornado\target\proj\Project1\rr.c 1 Error 322:Unable to open include file 'stdio.h'
C:\Tornado\target\proj\Project1\rr.c:6:macro `max' used with too many (3) args
C:\Tornado\target\proj\Project1\rr.c:10:macro `max' used with too many (3) args
请问这是为什么?