Try/Catch/Throw in C++

[aemado]

I am really new to the try/catch/throw concept, and can't figure out what is wrong with my code. Any suggestions?

#include <iostream>

using namespace std;

string msgZero = "Zero denominator\n";

void inverse(long value, double& answer) {

  if (value > 0) {

    answer = 1.0/value;

  }

  else {

    if (value == 0) {

        throw msgZero;

    }

    else {

      throw value;

    } 

  }  

  return; }

  

void fraction (long n, long d, double& result) {

   inverse(d, result);

   result = n * result; 

   return;

}     

int main () {

  while (true) {

    long numer, denom;

    double ans;

    cout << "Enter numerator and 

            denominator: ";

    if ((cin >> numer >> denom) == 0) break;

    try {

      fraction(numer, denom, ans);

    }

    catch (char* str) {

      cout << str; }

    cout << "Skipped the first catch block"<< endl;

    catch (long val) {    

      cout << "Negative denominator "<<

               val<< endl; }

    cout << “*********”<< endl;

  }     

  return (0);

}

[gpraghuram]

I am really new to the try/catch/throw concept, and can't figure out what is wrong with my code. Any suggestions?

#include <iostream>

using namespace std;

string msgZero = "Zero denominator\n";

void inverse(long value, double& answer) {

  if (value > 0) {

    answer = 1.0/value;

  }

  else {

    if (value == 0) {

        throw msgZero;

    }

    else {

      throw value;

    } 

  }  

  return; }

  

void fraction (long n, long d, double& result) {

   inverse(d, result);

   result = n * result; 

   return;

}     

int main () {

  while (true) {

    long numer, denom;

    double ans;

    cout << "Enter numerator and 

            denominator: ";

    if ((cin >> numer >> denom) == 0) break;

    try {

      fraction(numer, denom, ans);

    }

    catch (char* str) {

      cout << str; }

    cout << "Skipped the first catch block"<< endl;

    catch (long val) {    

      cout << "Negative denominator "<<

               val<< endl; }

    cout << “*********”<< endl;

  }     

  return (0);

}

Issue 1)You are throwing a string and in the catch block catching char *.
String is equivalent to char*
To find this add catch(...)after the last catch block and you can catch the exception there

Raghuram

[Banfa]

Issue 1)String is equivalent to char*

Is this a typo? I think you mean

String is not equivalent to char *

[gpraghuram]

Is this a typo? I think you mean

String is not equivalent to char *

Yes....Thats a Typo.

Thanks for pointing it.



Raghuram