Exception handling

This is a discussion on Exception handling within the C++ Programming forums, part of the General Programming Boards category; hi please can you help me in the following question? Write a C++ program that inputs a list of integer ...

  1. #1
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    Exception handling

    hi

    please can you help me in the following question?

    Write a C++ program that inputs a list of integer values in the range of -100 to 100 from the keyboard and computes the sum of the squares of the input values. This program must use exception handling to ensure that the input values are in range and are legal integers, to handle the error of the sum of the squares becoming larger than a standard int variable can store, and to detect end-of-file and use it to cause output of the result. In the case of overflow of the sum, an error message must be printed and the program terminated.

    can you please give me a hint how to solve this question?
    please set free our POWs

  2. #2
    and the hat of wrongness Salem's Avatar
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    > can you please give me a hint how to solve this question?
    Start with a board search for "exception" to see how other people have used it

    Which bit of the problem is actually causing you a problem, because at the moment, it's just homework dumped on the board.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  3. #3
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    This was my solution
    but i don't know how can i detect an overflow??

    Code:
    #include <iostream.h>
    
    int main(){
    	
        int x;
        int eof = 0;
        int sum = 0;
    
        cout<<"Enter a list of integers in the range of -100 to 100 (0 to end):"<<endl;
        cin>>x;
    	
          try{
            if(x<-100 || x>100)
              throw x;
            sum = x*x;}
          catch(int e){
            cout<<e<<" is out of range"<<endl;}
    
          while(x != eof){
            cin>>x;
            try{
              if(x<-100 || x>100)
                throw x;
              sum = sum+(x*x);}
            catch(int e){
              cout<<e<<" is out of range"<<endl;}
    	}
    	
           cout<<"sum of the input squares = "<<sum<<endl;
           return 0;}
    Last edited by kuwait; 12-11-2003 at 04:15 AM.
    please set free our POWs

  4. #4
    and the hat of wrongness Salem's Avatar
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    > but i don't know how can i detect an overflow??
    One way is like this

    Code:
    if ( INT_MAX - sum < x ) {
        // sum + x will be > INT_MAX - overflow will happen if you try it
        // throw exception
    }
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  5. #5
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    thanks for your help
    please set free our POWs

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