/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:27:9: error: incompatible types when returning type 'struct ZX' but 'int' was expected
  return zx;
         ^~
/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: warning: statement with no effect [-Wunused-value]
  ZX zx=wang(a,10);
  ^~
/in/foo.c:34:5: error: expected ';' before 'zx'
  ZX zx=wang(a,10);
     ^~
/in/foo.c:35:26: error: 'zx' undeclared (first use in this function)
  printf("%.2f %.2f %.2f",zx.max,zx.min,zx.ag);
                          ^~
/in/foo.c: In function 'wang':
/in/foo.c:28:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^