float price = 0
cin >>num
if (num >5)
{
price = 1.5*num
}
else
{
price = 0.5*num
}
cout <<"总价格是：" <<price <<endl
#include<stdio.h>int sum
int yazi(int n)
{
if(7==n)
return 1
else
{
printf(" sell=%d",(sum+2)*2)
sum=(sum+1)*2
return (yazi(n+1)+1)*2
}
}
int main()
{ int k=1
printf(" 总数：%d",yazi(k))
printf("\n")
return 0
}
