[C++] 暑假C计划.01

int main（）
{
 int age = 10 ;
 if (age < 18)
   printf("未成年\n");
 else
   printf("成年\n");
 return 0;
}

int main()
{
 int age = 66;
 if(age < 18)
 printf("未成年\n");
 else 
  {
    if( age >= 18 && age < 26 )
    printf("青年\n");
    if( age >= 26 && age < 50 )
    printf("中年\n");
    if( age >= 50 && age < 80 )
    printf("老年\n");
    else
    printf("老不死\n");
   }
 
 return 0 ;
}

int main()
{
 int a = 1;
 int b = 2;
 if(a == 0);
   if(b == 2);
   printf("hehe\n");
   else
   printf("haha\n");
 return 0 ;
}

int main()
{
 int a = 1 ;
 int b = 2;
 if(a == 0)
  {
   if(b == 2)
   printf("hehe\n");
   }
 else
 printf("haha\n");
 return 0;
}

//错误示范
int main()
{
 int A = 1 ;
 if ( A = 2)
 printf ("haha\n");
 else 
 printf ("hehe\n")
 return 0;
}

//int main()
//{
//int num = 4;
//if(5 == num)//赋值bug  倒着写更加靠谱常量放在左边
//{
//printf("呵呵\n");//
//}
//return 0;
//}

//打印100里的奇数(1)
int main()
{
 int i = 1;
 while(i<100)
  {
  printf("%d\n",i);
  i+=2;
  }
 return 0;
}

//打印100里的奇数（2）
int main()
{
 int i = 1 ;
 while(i<100)
   {
   if ( i%2 == 1 )
   printf("%d\n",i);
   i++;
   }
 return 0 ;
}