View Compilation Error

0_0_19521765_29556.cpp: In function 'int main()':
0_0_19521765_29556.cpp:4:21: error: 'scanf' was not declared in this scope
  while(scanf("%d",&m)!=EOF)
                     ^
0_0_19521765_29556.cpp:4:24: error: 'EOF' was not declared in this scope
  while(scanf("%d",&m)!=EOF)
                        ^
0_0_19521765_29556.cpp:19:21: error: 'printf' was not declared in this scope
     printf("%d ",ave);
                     ^
0_0_19521765_29556.cpp:33:21: error: 'printf' was not declared in this scope
     printf("%d ",ave);
                     ^
0_0_19521765_29556.cpp:40:27: error: 'printf' was not declared in this scope
    printf("%d",sum/(m-k*n));
                           ^
0_0_19521765_29556.cpp:42:14: error: 'printf' was not declared in this scope
   printf("\n");
              ^