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#include <iostream>
using namespace std;
template <class T>
long int funnyfunc(T val1, T val2, T val3);
void testvalue(int value, short unsigned int code);
void drawmenu(void);
int main(void)
{
double num1, num2,num3;
short unsigned int choice = 0;
while(choice!=4)
{
cout<<"please select from the following menu ";
drawmenu();
cin>>choice;
try
{
testvalue(choice, 3);
break;
}
catch (char* eString)
{
cout<< eString <<endl;
cout<<" please re enter your menu choice ";
}
}
if (choice == 4)
{
cout <<"the program is over";
}
else
{
cout<<"please enter your first numeber ";
cin>>num1;
cout<<"please enter your second numeber ";
cin>>num2;
cout<<"please enter your third numeber ";
cin>>num3;
}
enum BITOPS {INTEGER = 1, FLOAT, DOUBLE};
BITOPS myOps = INTEGER;
myOps = BITOPS(choice);
switch(myOps)
{
case INTEGER:
cout<<"the result of interger type value is " <<funnyfunc(num1, num2, num3)<<endl;
break;
case FLOAT:
cout<<"the result of float type value is " <<funnyfunc(num1, num2, num3)<<endl;
break;
case DOUBLE:
cout<<"the result of double type value is " <<funnyfunc(num1, num2, num3)<<endl;
break;
default:
cout<<"thank you for using !"<<endl;
}
}
template <class T>
long int funnyfunc(T val1, T val2, T val3)
{
return ((val1+val2)*val3);
}
void testvalue(int value, short unsigned int code)
{
switch(code)
{
case 1:
if(value < 0 )
throw "error - value cannot be negative \n";
break;
case 2:
if(value==0)
throw "error you can't divided by zero \n";
break;
case 3:
if (value < 1|| value > 4)
throw "error - invalid menu selection";
break;
default:
cout<<" unhandled exception";
cout<<"program will stop";
exit(1);
}
}
void drawmenu(void)
{
cout<<endl<<"\t1 - interger"<<endl;
cout<<"\t2 - float" <<endl;
cout<<"\t3 - double"<<endl;
cout<<"\t4 - end this program";
}
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