View Compilation Error

0_0_22711776_7271.cpp: In function 'int main(int, char**)':
0_0_22711776_7271.cpp:7:35: error: expected primary-expression before '<' token
  while(cin>>a>>b&&a>99&&a<1000&&a=<b&&b>99&&b<1000){
                                   ^
0_0_22711776_7271.cpp:8:18: error: 'memchr' was not declared in this scope
   memchr(q,0,1000);
                  ^