帮小弟我看看这个程序错在哪里，多谢

帮我看看这个程序错在哪里，谢谢
#include<iostream>
float add(float num1,float num2)
{
  return num1+num2;
}
  float sub(float num1,float num2)
{
  return num1-num2;  
}
  float num(float num1,float num2)
{
 return num1*num2;
}
  float div(float num1,float num2)
{
  if (num2!=0)
  return num1/num2;
  else
  {
cout<<"除数不能为0"<<endl;
returu 0;
  }
}
  float caculate(float (*cal)(float n1,float n2),float num1,float num2)
{
  return cal(num1,num2);
}
  void main()
  {
cout<<"输入计算式，格式为：操作数1运算符操作数2";
float num1,num2,result;
char op;
cin>>num1>>op>>num2;
swich(op)
{
case'+':result=caculate(add,num1,num2);break；
  case'-':result=caculate(sub,num1,num2);break;
  case'*':result=caculate(mul,num1,num2);break;
  case'/':result=caculate(div,num1,num2);break;
  }
cout<<num1<<op<<num2<<"="<<result<<endl;
  }

[解决办法]

C/C++ code

#include<iostream>using namespace std;             //float add(float num1,float num2){    return num1+num2;}float sub(float num1,float num2){    return num1-num2;   }float mul(float num1,float num2)         //{       return num1*num2; }float div(float num1,float num2){       if (num2!=0)           return num1/num2;       else       {           cout<<"除数不能为0"<<endl;           return 0;                    //       }}float caculate(float (*cal)(float n1,float n2),float num1,float num2){       return cal(num1,num2);}void main(){       cout<<"输入计算式，格式为：操作数1运算符操作数2";       float num1,num2,result;       char op;       cin>>num1>>op>>num2;       switch(op)                     //       {case'+':result=caculate(add,num1,num2);break;     //case'-':result=caculate(sub,num1,num2);break;case'*':result=caculate(mul,num1,num2);break;case'/':result=caculate(div,num1,num2);break;       }       cout<<num1<<op<<num2<<"="<<result<<endl;}