View Compilation Error

0_0_15676720_13401.cpp: In function 'int main()':
0_0_15676720_13401.cpp:10:25: error: 'x' was not declared in this scope
     while(scanf("%d%d",&x,&y)!=EOF&&(m!=0||n!=0))
                         ^
0_0_15676720_13401.cpp:10:28: error: 'y' was not declared in this scope
     while(scanf("%d%d",&x,&y)!=EOF&&(m!=0||n!=0))
                            ^