#include<stdio.h>
int main()
{
void action1(double,double),action2(double,double),action3(double,double),action4(double,double);
char ch;
double a,b;
scanf("%lf%c%lf",&a&ch&b);
switch(ch)
{
case`+`:action1(a,b);break;
case`-`:action2(a,b);break;
case`*`:action3(a,b);break;
case`/`:action4(a,b);break;
defult:printf("输入错误!\n");
}
return 0;
}
void action1(double x,double y)
{
printf("x+y=%d\n",x+y);
}
void action2(double x,double y)
{
printf("x-y=%d\n",x-y);
}
void action3(double x,double y)
{
printf("x*y=%d\n",x*y);
}
void action4(double x,double y)
{
printf("x/y=%d\n",x/y);
}
请各位大神看看错在哪里了呢？

不知道，等散分。

:\Program Files\Microsoft Visual Studio\COMMON\MSDev98\Bin\xvxiang.c(7) : error C2296: '&' : illegal, left operand has type 'double *'
C:\Program Files\Microsoft Visual Studio\COMMON\MSDev98\Bin\xvxiang.c(10) : error C2018: unknown character '0x60'
C:\Program Files\Microsoft Visual Studio\COMMON\MSDev98\Bin\xvxiang.c(10) : error C2018: unknown character '0x60'
C:\Program Files\Microsoft Visual Studio\COMMON\MSDev98\Bin\xvxiang.c(10) : error C2059: syntax error : ':'
C:\Program Files\Microsoft Visual Studio\COMMON\MSDev98\Bin\xvxiang.c(11) : error C2018: unknown character '0x60'
C:\Program Files\Microsoft Visual Studio\COMMON\MSDev98\Bin\xvxiang.c(11) : error C2018: unknown character '0x60'
C:\Program Files\Microsoft Visual Studio\COMMON\MSDev98\Bin\xvxiang.c(11) : error C2059: syntax error : ':'
C:\Program Files\Microsoft Visual Studio\COMMON\MSDev98\Bin\xvxiang.c(12) : error C2018: unknown character '0x60'
C:\Program Files\Microsoft Visual Studio\COMMON\MSDev98\Bin\xvxiang.c(12) : error C2018: unknown character '0x60'
C:\Program Files\Microsoft Visual Studio\COMMON\MSDev98\Bin\xvxiang.c(12) : error C2059: syntax error : ':'
C:\Program Files\Microsoft Visual Studio\COMMON\MSDev98\Bin\xvxiang.c(13) : error C2018: unknown character '0x60'
C:\Program Files\Microsoft Visual Studio\COMMON\MSDev98\Bin\xvxiang.c(13) : error C2059: syntax error : '/'
C:\Program Files\Microsoft Visual Studio\COMMON\MSDev98\Bin\xvxiang.c(13) : error C2018: unknown character '0x60'
Error executing cl.exe.

xvxiang.obj - 13 error(s), 0 warning(s)

这是编译结果

自己去看第7行，仔细看，认真想。

谢谢啊

少打三个逗号

现在知道怎么看编译器信息了吗？你问哪里错了，其实编译器已经告诉了答案，不应该问的，就算要问，也应该早把编译信息贴出来，我2楼故意那样答你，算你反应快，不然锁帖了。看看本坛的置顶帖。

嗯，太谢谢了，我大一的新手，还望见谅