请高手帮忙指点一下枚举类型的C程序，谢谢……
/*枚举类型实例：口袋中有红，黄，蓝，白，黑5种颜色的球若干个。每次从口袋中先后取出3个球，问得到3种不同色的球的可能取法，输出每种排列的情况*/
#include<stdio.h>
int main()
{
enum color{red,yellow,blue,white,black};
enum color i,j,k,pri;
int n,loop;
n=0;
for(i=red;i<=black;i++)
{
for(j=red;j<=black;j++)
{
if(i!=j)
{
for(k=red;k<=black;k++)
{
if((k!=i)&&(k!=j))
{
n=n+1;
printf("%-4d",n);
for(loop=1;loop<=3;loop++)
{
switch(loop)
{
case 1: pri=i;break;
case 2: pri=j;break;
case 3: pri=k;break;
default:break;
}
switch(pri)
{
case red: printf("%-10s","red");break;
case yellow: printf("%-10s","yellow");break;
case blue: printf("%-10s","blue");break;
case white: printf("%-10s","white");break;
case black: printf("%-10s","black");break;
default:break;
}
}
printf("\n");
}
}
}
}
}
printf("\ntotal:%5d\n",n);
}
编译出错：
--------------------Configuration: meiju - Win32 Debug--------------------
Compiling...
11.cpp
c:\myprojects\meiju\11.cpp(11) : error C2676: binary '++' : 'enum main::color' does not define this operator or a conversion to a type acceptable to the predefined operator
c:\myprojects\meiju\11.cpp(13) : error C2676: binary '++' : 'enum main::color' does not define this operator or a conversion to a type acceptable to the predefined operator
c:\myprojects\meiju\11.cpp(17) : error C2676: binary '++' : 'enum main::color' does not define this operator or a conversion to a type acceptable to the predefined operator
c:\myprojects\meiju\11.cpp(49) : warning C4508: 'main' : function should return a value; 'void' return type assumed
执行 cl.exe 时出错.
11.obj - 1 error(s), 0 warning(s)
