int n;
longs=1;
printf("input n:");
scanf("%D",&n);
while(n>1)
{
s=s*n;
n--;
}
printf("result:%l,s);
//***dowhile
int n;
longs=1;
printf("input n:");
scanf("%D",&n);
do{s=s*n;n--;}while(n>1);
printf("result:%l",s);
//***-for
int n,i;
longs=1;
printf("input n:");
scanf("%D",&n);
for(i=1;i