View Compilation Error

0_0_31384504_11537.cpp: In function 'int main()':
0_0_31384504_11537.cpp:10:21: error: 'j' was not declared in this scope
 int xx=i+j;int yy=i-j;
                     ^
0_0_31384504_11537.cpp:11:4: error: 'xx' was not declared in this scope
 if(xx==x&&yy==y)
    ^