View Compilation Error

0_0_30947299_16513.cpp: In function 'int main()':
0_0_30947299_16513.cpp:15:28: error: 'u' was not declared in this scope
             scanf("%d %d",&u,&v);
                            ^
0_0_30947299_16513.cpp:15:31: error: 'v' was not declared in this scope
             scanf("%d %d",&u,&v);
                               ^