View Compilation Error

0_0_37367545_7641.c: In function 'main':
0_0_37367545_7641.c:8:6: error: 'x' undeclared (first use in this function)
   if(x[3]>a[2]&&x[3]>a[1]||x[3]>a[3]&&x[3]>a[4]||y[3]>b[1]&&y[3]>b[2]||y[3]>b[3]&&y[3]>b[4]) 
      ^
0_0_37367545_7641.c:8:6: note: each undeclared identifier is reported only once for each function it appears in
0_0_37367545_7641.c:8:11: error: 'a' undeclared (first use in this function)
   if(x[3]>a[2]&&x[3]>a[1]||x[3]>a[3]&&x[3]>a[4]||y[3]>b[1]&&y[3]>b[2]||y[3]>b[3]&&y[3]>b[4]) 
           ^
0_0_37367545_7641.c:8:50: error: 'y' undeclared (first use in this function)
   if(x[3]>a[2]&&x[3]>a[1]||x[3]>a[3]&&x[3]>a[4]||y[3]>b[1]&&y[3]>b[2]||y[3]>b[3]&&y[3]>b[4]) 
                                                  ^
0_0_37367545_7641.c:8:55: error: 'b' undeclared (first use in this function)
   if(x[3]>a[2]&&x[3]>a[1]||x[3]>a[3]&&x[3]>a[4]||y[3]>b[1]&&y[3]>b[2]||y[3]>b[3]&&y[3]>b[4]) 
                                                       ^