View Compilation Error

0_0_23025245_18488.cpp: In function 'int main()':
0_0_23025245_18488.cpp:4:24: error: 'scanf' was not declared in this scope
     while(scanf("%d",&s)!=EOF)
                        ^
0_0_23025245_18488.cpp:4:27: error: 'EOF' was not declared in this scope
     while(scanf("%d",&s)!=EOF)
                           ^
0_0_23025245_18488.cpp:7:44: error: 'printf' was not declared in this scope
            if(s<0) printf("Score is error!");
                                            ^
0_0_23025245_18488.cpp:11:35: error: 'printf' was not declared in this scope
                case 0:printf("E\n") ;break;
                                   ^