View Compilation Error

0_0_33321249_31665.cpp: In function 'int main()':
0_0_33321249_31665.cpp:206:26: error: 'x' was not declared in this scope
     else printf("%d", mt[x][y] + val);
                          ^
0_0_33321249_31665.cpp:206:29: error: 'y' was not declared in this scope
     else printf("%d", mt[x][y] + val);
                             ^
0_0_33321249_31665.cpp:206:34: error: 'val' was not declared in this scope
     else printf("%d", mt[x][y] + val);
                                  ^