运行 ID: 1392

Main.cc: In function ‘int main()’:
Main.cc:5:8: error: ‘b’ was not declared in this scope
  while(b<=a){
        ^
Main.cc:4:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&a);
  ~~~~~^~~~~~~~~