Can i use a switch to hold a function?
- by TIMOTHY
I have a 3 file program, basically teaching myself c++. I have an issue. I made a switch to use the math function. I need and put it in a variable, but for some reason I get a zero as a result.
Also another issue, when I select 4 (divide) it crashes... Is there a reason?
Main file:
#include <iostream>
#include "math.h"
#include <string>
using namespace std;
int opersel;
int c;
int a;
int b;
string test;
int main(){
cout << "Welcome to Math-matrix v.34"<< endl;
cout << "Shall we begin?" <<endl;
//ASK USER IF THEY ARE READY TO BEGIN
string answer;
cin >> answer;
if(answer == "yes" || answer == "YES" || answer == "Yes")
{
cout << "excellent lets begin..." << endl;
cout << "please select a operator..." << endl << endl;
cout << "(1) + " << endl;
cout << "(2) - " << endl;
cout << "(3) * " << endl;
cout << "(4) / " << endl;
cin >> opersel;
switch(opersel){
case 1:
c = add(a,b);
break;
case 2:
c = sub(a,b);
break;
case 3:
c = multi(a,b);
break;
case 4:
c = divide(a,b);
break;
default:
cout << "error... retry" << endl;
}// end retry
cout << "alright, how please select first digit?" << endl;
cin >> a;
cout << "excellent... and your second?" << endl;
cin >> b;
cout << c;
cin >> test;
}else if (answer == "no" || answer == "NO" || answer == "No"){
}//GAME ENDS
}// end of int main
Here is my math.h file
#ifndef MATH_H
#define MATH_H
int add(int a, int b);
int sub(int a, int b);
int multi(int a, int b);
int divide(int a, int b);
#endif
Here is my math.cpp:
int add(int a, int b)
{
return a + b;
}
int sub(int a, int b)
{
return a - b;
}
int multi(int a, int b)
{
return a * b;
}
int divide(int a, int b)
{
return a / b;
}
}// end of int main
