View Compilation Error

0_0_20319181_32441.cpp: In function 'int main()':
0_0_20319181_32441.cpp:17:21: error: cannot convert 'int*' to 'char*' for argument '2' to 'char* itoa(int, char*, int)'
         itoa(n,str,r);
                     ^
0_0_20319181_32441.cpp:18:19: error: cannot convert 'int*' to 'char*' for argument '1' to 'char* strupr(char*)'
         strupr(str);
                   ^