#include <stdio.h>
void main()
{
int n1,n2,result; /*result代表結果*/
char oper;
printf("請輸入兩個數: ");
scanf("%d%d",&n1,&n2);
fflush(stdin)/*此處清除鍵盤緩沖區,否則結果是錯的*/
printf("\n請輸入運算");/*此處是printf書寫錯誤*/
scanf("%c",&oper);
switch(oper)
{
case '+':
result=n1+n2;
break;
case '-':
result=n1-n2;
break;
case '*':
result=n1*n2;
break;
case '/':
result=n1/n2;
break;
}
printf("\n%d %c %d = %d\n",n1,oper,n2,result);
}