#include <stdio.h>
#include <stdlib.h>
int main()
{
int x,y,result;
int ch;
int add(int, int);
int sub(int, int);
int mul(int, int);
int Except(int, int);
printf("1. add\n");
printf("2. sub\n");
printf("3. mul\n");
printf("4. div\n");
printf("================\n");
printf("請輸2個數數：");
scanf("%d %d", &x,&y);
printf("choose Function: ");
scanf("%d",&ch);
//printf("%d\n",ch);
switch(ch)
{
case 1:
result=add(x,y);
printf("The result is=%d\n",result);
break;
case 2:
result=sub(x,y);
printf("The result is =%d\n",result);
break;
case 3:
result=mul(x,y);
printf("The result is=%d\n",result);
break;
case 4:
result=Except(x,y);
printf("The result is =%d\n",result);
break;
default:
printf("選項錯誤 %d\n",ch);
}
system("pause");
return 0;
}
int add(int a,int b)
{
return(a+b);
}
int sub(int a,int b)
{
return(a-b);
}
int mul(int a,int b)
{
return(a*b);
}
int Except(int a,int b)
{
return(a/b);
}
