运行 ID: 1992

Main.cc: In function ‘int main()’:
Main.cc:8:2: error: ‘c’ was not declared in this scope
  c=a+2;
  ^
Main.cc:4:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&m);
  ~~~~~^~~~~~~~~