View Compilation Error

0_0_28650819_17642.cpp: In function 'int main()':
0_0_28650819_17642.cpp:30:9: error: 'minx' was not declared in this scope
         minx=max(x1,x2);
         ^
0_0_28650819_17642.cpp:32:9: error: 'miny' was not declared in this scope
         miny=max(y1,y2);
         ^
0_0_28650819_17642.cpp:34:9: error: 'maxx' was not declared in this scope
         maxx=min(ax1,ax2);
         ^
0_0_28650819_17642.cpp:36:9: error: 'maxy' was not declared in this scope
         maxy=min(ay1,ay2);
         ^