View Compilation Error

0_0_25113872_18129.cpp: In function 'int main()':
0_0_25113872_18129.cpp:22:18: error: 'x' was not declared in this scope
     scanf("%d", &x);
                  ^
0_0_25113872_18129.cpp:47:18: error: 'k' was not declared in this scope
     scanf("%d", &k);
                  ^