/in/foo.c:8:1: error: unknown type name 'ZX'
 ZX wang(float a[],int n)
 ^~
/in/foo.c:8:1: note: use 'struct' keyword to refer to the type
/in/foo.c: In function 'wang':
/in/foo.c:10:2: error: unknown type name 'ZX'
  ZX zx;
  ^~
/in/foo.c:10:2: note: use 'struct' keyword to refer to the type
/in/foo.c:11:4: error: request for member 'max' in something not a structure or union
  zx.max=a[0];
    ^
/in/foo.c:12:4: error: request for member 'min' in something not a structure or union
  zx.min=a[0];
    ^
/in/foo.c:13:4: error: request for member 'ag' in something not a structure or union
  zx.ag=0;
    ^
/in/foo.c:16:8: error: request for member 'max' in something not a structure or union
   if(zx.max<a[i])
        ^
/in/foo.c:18:6: error: request for member 'max' in something not a structure or union
    zx.max=a[i];
      ^
/in/foo.c:20:8: error: request for member 'min' in something not a structure or union
   if(zx.min>a[i])
        ^
/in/foo.c:22:6: error: request for member 'min' in something not a structure or union
    zx.min=a[i];
      ^
/in/foo.c:24:5: error: request for member 'ag' in something not a structure or union
   zx.ag+=a[i];
     ^
/in/foo.c:25:5: error: request for member 'ag' in something not a structure or union
   zx.ag/=n;
     ^
/in/foo.c: In function 'main':
/in/foo.c:33:15: error: 'a' undeclared (first use in this function)
   scanf("%f",&a[i]);
               ^
/in/foo.c:33:15: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:34:2: error: unknown type name 'ZX'
  ZX zx=wang(a,10);
  ^~
/in/foo.c:34:2: note: use 'struct' keyword to refer to the type
/in/foo.c:35:28: error: request for member 'max' in something not a structure or union
  printf("%.2f %.2f,%.2f",zx.max,zx.min,zx.ag);
                            ^
/in/foo.c:35:35: error: request for member 'min' in something not a structure or union
  printf("%.2f %.2f,%.2f",zx.max,zx.min,zx.ag);
                                   ^
/in/foo.c:35:42: error: request for member 'ag' in something not a structure or union
  printf("%.2f %.2f,%.2f",zx.max,zx.min,zx.ag);
                                          ^
/in/foo.c:34:5: warning: variable 'zx' set but not used [-Wunused-but-set-variable]
  ZX zx=wang(a,10);
     ^~