我也是在入门中，前辈们告诉我代码要多练。希望下面代码能帮到你,一起加油！
#include <stdio.h>
int main();
{
double i = 0，j = 0;
char operator = 0;
printf（"请输入要运算的数:");
scanf("%lf %c %lf", &i, &operator, &j);
switch(operator)
{
case'+':printf("%lf\n", i+j);
break;
case'-':printf("%lf\n",i-j);
break;
case'*':printf("%lf\n",i*j);
break;
case'/':
if(j==0)
{
printf("除零错误！");
}
else
}
printf("%lf\n",i/j);
}
break;
default:printf("错误");
break;
}
return 0;
}