View Compilation Error

0_0_34054884_24145.cpp: In function 'int main()':
0_0_34054884_24145.cpp:3:29: error: 'scanf' was not declared in this scope
     while(scanf("%d%d",&a,&b)!=EOF){
                             ^
0_0_34054884_24145.cpp:3:32: error: 'EOF' was not declared in this scope
     while(scanf("%d%d",&a,&b)!=EOF){
                                ^
0_0_34054884_24145.cpp:4:28: error: 'printf' was not declared in this scope
      if(a==b)printf("YES\n");
                            ^
0_0_34054884_24145.cpp:5:27: error: 'printf' was not declared in this scope
         else printf("NO\n");
                           ^