View Compilation Error

0_0_27303919_9261.cpp: In function 'int main()':
0_0_27303919_9261.cpp:23:10: error: 'minx1' was not declared in this scope
          minx1=min(x1,x2);
          ^
0_0_27303919_9261.cpp:24:7: error: 'miny1' was not declared in this scope
       miny1=min(y1,y2);
       ^
0_0_27303919_9261.cpp:25:7: error: 'maxx1' was not declared in this scope
       maxx1=max(x1,x2);
       ^
0_0_27303919_9261.cpp:26:7: error: 'maxy1' was not declared in this scope
       maxy1=max(y1,y2);
       ^
0_0_27303919_9261.cpp:27:7: error: 'minx2' was not declared in this scope
       minx2=min(x3,x4);
       ^
0_0_27303919_9261.cpp:28:7: error: 'miny2' was not declared in this scope
       miny2=min(y3,y4);
       ^
0_0_27303919_9261.cpp:29:7: error: 'maxx2' was not declared in this scope
       maxx2=max(x3,x4);
       ^
0_0_27303919_9261.cpp:30:7: error: 'maxy2' was not declared in this scope
       maxy2=max(y3,y4);
       ^
0_0_27303919_9261.cpp:44:6: error: expected primary-expression before ')' token
   if()
      ^