View Compilation Error

In file included from 0_0_19087407_2563.cpp:1:0:
0_0_19087407_2563.cpp: In function 'int main()':
0_0_19087407_2563.cpp:5:29: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
  while((scanf("%d%d",&a,&b!=EOF)&&a>b&&a>=100&&b<=999){
                             ^
0_0_19087407_2563.cpp:5:55: error: expected ')' before '{' token
  while((scanf("%d%d",&a,&b!=EOF)&&a>b&&a>=100&&b<=999){
                                                       ^