View Compilation Error

0_0_25521667_13336.cpp: In function 'int main()':
0_0_25521667_13336.cpp:30:75: error: 'scanf' was not declared in this scope
     while(scanf("%lf%lf%lf%lf%lf%lf%lf%lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4)!=EOF){
                                                                           ^
0_0_25521667_13336.cpp:30:78: error: 'EOF' was not declared in this scope
     while(scanf("%lf%lf%lf%lf%lf%lf%lf%lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4)!=EOF){
                                                                              ^
0_0_25521667_13336.cpp:44:60: error: 'printf' was not declared in this scope
         printf("%.2lf\n",(x1>x2 || y1>y2)?0:(x2-x1)*(y2-y1));         
                                                            ^