c++ if语句

#include<iostream>
using namespace std;

void func(int a )
{
   if (a>0)
   {
      if (a%2==1)
      {
         cout << "a is a positive odd number" << endl;
      }
      else
      {
         cout << "a is a positive even number\n";
      }
   }
   else if (a<0 && abs(a)%2==1)
   {
      cout << "a is a negative odd number\n";
   }
   else if (a==0){
      cout << "a is 0\n";
   }
   else
   {
      cout << "a is a nagative even number\n";
   }

   if (a>0 || a==0)
   {
      cout << "a is not negative\n";
   }
   
}

int main(){

   int a;
   cout << "enter number a :" << endl;
   cin >> a;
   func(a);

   return 0;
}`在这里插入代码片`