# include <stdio.h>

# define RATE1 = 1.0f  
# define RATE2 = 0.9f  
# define RATE3 = 0.8f  

int main(void)
{
    int num;
    float money, price;

    printf("请输入物品数量:");
    scanf("%d", &num);
    printf("请输入价格:");
    scanf("%d", &price);

    if(num < 10)
        money = price * num * RATE1;
    else if(num >= 10)
        money = price * num * RATE2;
    else(num >= 100)
        money = price * num * RATE3;

    printf("总价 %f\n", money);

    return 0;
}

vc6.0中提示money = price * num * RATE1;有错误，应该怎么改？

# define RATE1 = 1.0f  
# define RATE2 = 0.9f  
# define RATE3 = 0.8f

改为

#define RATE1   1.0f  
#define RATE2   0.9f  
#define RATE3   0.8f

程序可以运行了但是结果不对

--------------------Configuration: discount - Win32 Debug--------------------
Linking...
LIBCD.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
Debug/discount.exe : fatal error LNK1120: 1 unresolved externals
执行 link.exe 时出错.

discount.exe - 1 error(s), 0 warning(s)

#define RATE1   1.0f
#define RATE2   0.9f
#define RATE3   0.8f

main()
{int num;
    float money, price;

    printf("请输入物品数量:");
    scanf("%d", &num);
    printf("请输入价格:");
    scanf("%f", &price);

    if(num < 10)
        money = price * num * RATE1;
    else if(num >= 10&&num<100)
        money = price * num * RATE2;
    else
        money = price*num*RATE3;

    printf("总价 %f\n", money);

getch();}