[zhan]

what are listed below is my program about the homework, but I don't what's wrong with it, it doesn't work/

#include <iostream>
#include <cmath>
using namespace std;

//declarations of functions
double processArgs(double x, double y);//two operands function
double processArgs(double x);//one operand function
void print(double x,double y);//two operands print functions
void print(double x)// one operands print functions
int processchoice();//a function to process menu or user choice

//main function
int main () 
{
    int choice;// menu choice
    double x,y,result;
    do {
        choice=processchoice();
        swith(choice)
        case 1:result=processArgs(x,y);
               cout<<print(x,y)<<result<<endl;
        break;
        
        case2:
        result=processArgs(x);
        cout<<print(x)<< result<<endl;
        break;
        
        if (choice==3) break;//quit the program
        
    } while (choice!=3);
    return 0;
}

    
    
    //The functions to support the main program above are below
    
    int processchoice() {
        int choice;
        cout<<"1) Enter two-argument expression"<<endl;
        cout<<"2)Enter one-argument expression"<<endl;
        cout<<"3)quit program"<<endl;
        cin>>choice;
        return(choice);
    }
    
    double processArgs(double x, double y) {
        char op;
        double result;
        cout<<"chose your operator";
        cout<<"+:add"<<endl;
        cout<<"-:subtract"<<endl;
        cout<<"*:multiply"<<endl;
        cout<<"/:devide"<<endl;
        cout<<"^:power"<<endl;
        cin>>op;
        switch(op) {
            case '+': result=x+y;
            break;
            case '-': result=x-y;
            break;
            case '*': result=x*y;
            break;
            case'/':
            if (y!=0)
            result=x/y;
            else
            cout<<"Don't try to divide by zero"<<endl;
            break; 
            case'^': result=pow(x,y);
            break;
            }
            return(result);
    }
    double processArgs(double x) {
        char op;
        double result;
        cout<<"S:squar"<<endl;
        cout<<"E:exponential"<<endl;
        cout<<"L: natural logarithm"<<endl;
        cout<<"chose your operator"<<endl;
        cin>>op;
        switch(op) {
            case 'S':
            result=sqr(x);
            break;
            case 'E':
            result=exp(x);
            break;
            case 'L':
            result=log(x);
            break;
        }
        return(result);
    }
    void print(double x,double y) {
        char op;
        cout<<"Enter an X op Y expression: << x << op<<y<<endl;
        cout<< x<<op<<y<<"=";
    }
    void print(double x) {
        char op;
        cout<< " Enter an op X style expression: " << op << x << endl;
        cout << op <<x<<"=";
    }