View Compilation Error

0_0_37393344_13832.cpp: In function 'int main()':
0_0_37393344_13832.cpp:6:18: error: 'scanf' was not declared in this scope
     scanf("%d",&n);
                  ^
0_0_37393344_13832.cpp:27:25: error: 'printf' was not declared in this scope
        printf("%s\n",str);
                         ^