Combination of ABC

#include
#include
void main()
{
char st[]={'A','B','C'};
int i,t=0,Tval=0,val=123;
clrscr();
printf("Combination of ABC\n");
for(i=0;i<=5;i++)
{
Tval=val;
while(Tval!=0)
{
t=Tval%10;
/*printf("%d",t);*/
printf("%c",st[t-1]);
Tval=Tval/10;
}
printf("\n");
switch(i)
{
case 0:
case 4:
val=val+9;
break;
case 1:
case 3:
val=val+81;
break;
case 2:
val=val+18;
break;
}
}
getch();
}
Output
Combination of ABC
CBA
BCA
CAB
ACB
BAC
ABC