View Compilation Error

0_0_37986866_7780.cpp: In function 'int main()':
0_0_37986866_7780.cpp:3:25: error: 'scanf' was not declared in this scope
     while( scanf("%d",&n) != EOF ) {
                         ^
0_0_37986866_7780.cpp:3:30: error: 'EOF' was not declared in this scope
     while( scanf("%d",&n) != EOF ) {
                              ^
0_0_37986866_7780.cpp:19:26: error: 'printf' was not declared in this scope
         printf("%d\n",lcm);
                          ^