View Compilation Error

0_0_22940543_5460.cpp: In function 'int main()':
0_0_22940543_5460.cpp:4:24: error: 'scanf' was not declared in this scope
     while(scanf("%d",&i)!=EOF)
                        ^
0_0_22940543_5460.cpp:4:27: error: 'EOF' was not declared in this scope
     while(scanf("%d",&i)!=EOF)
                           ^
0_0_22940543_5460.cpp:11:24: error: 'printf' was not declared in this scope
         printf("%d\n",s);
                        ^