View Compilation Error

0_0_37308774_3033.cpp: In function 'int main()':
0_0_37308774_3033.cpp:6:29: error: 'scanf' was not declared in this scope
     while(scanf("%d%d",&a,&b)!=EOF)
                             ^
0_0_37308774_3033.cpp:6:32: error: 'EOF' was not declared in this scope
     while(scanf("%d%d",&a,&b)!=EOF)
                                ^
0_0_37308774_3033.cpp:7:24: error: 'printf' was not declared in this scope
         printf("%d",a+b);
                        ^