太久沒寫C了，查了一下，發現沒有boolean 型態，所以那就用int 代替啦
#include <stdio.h>
int main(void)
{
int serverusers[5][2]=
{
1,14,
2,28,
3,19,
4,8,
5,15};
int server;
int i;
int existFlag;
printf("enter the server number: \n");
scanf("%d",&server);
//look it up in the table.
existFlag = 0;
for(i=0;i<5;i++)
if(server==serverusers[i][0]){
existFlag = 1;
printf("there are %d users on server %d.\n",serverusers[i][1],server);
break;
}
//report error if not found.
if(existFlag==0) printf("server not listed.\n");
return 0;
}
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