View Compilation Error

0_0_21383734_30982.cpp: In function 'void mix(int, int)':
0_0_21383734_30982.cpp:27:16: error: return-statement with a value, in function returning 'void' [-fpermissive]
         return 1;
                ^
0_0_21383734_30982.cpp:29:12: error: return-statement with a value, in function returning 'void' [-fpermissive]
     return 0;
            ^
0_0_21383734_30982.cpp: In function 'int main()':
0_0_21383734_30982.cpp:59:22: error: too few arguments to function 'void mix(int, int)'
         if(mix(a[i].u),a[i].v)
                      ^
0_0_21383734_30982.cpp:21:6: note: declared here
 void mix(int x,int y)
      ^