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need help with a loop and aray

Posted on 2004-10-19
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Last Modified: 2010-04-01
i neeed help writting a program that asks the user to input 10 integers tests to make sure it is an integer and assorts it in assending order if they ener a invalid number ask them to reenter it

i need help with this and it is urgent so anyone that can help me with this i would gatelly appreciate it

maybe some hints or some code on how i should go about this

thanks
ted
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Question by:tedschnieders
  • 2
3 Comments
 
LVL 86

Expert Comment

by:jkr
ID: 12349570
#include <list>
#include <iostream>
using namespace std;

int ReadInt () {

    int n;
    string str;
      while (1) {

        cout << "Enter an integer: " << endl;

          getline(cin,str);

        char* pc;
            n = (int) strtol(str.c_str(),&pc,10);

            if (*pc) { // conversion error, not a valid int

                cout << "Invalid number" << endl;

            } else break; // terminate loop
      }

      return n;
}

int main () {

    list<int> lst;
    int n;

      for ( int i = 0; i < 10; ++i) {

          n = ReadInt ();

            lst.push_back(n);
      }

      lst.sort();

      for ( list<int>::iterator it = lst.begin(); it != lst.end; ++it) {

          cout << *it << endl;
      }
}
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Author Comment

by:tedschnieders
ID: 12349737
thank you for responding so quickly

i want them to enter one number at a time and store them in a array 0 - 9
then i want to spit them back out in acccending orplease help me
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LVL 86

Accepted Solution

by:
jkr earned 500 total points
ID: 12349889
Oh, in this case, you could use

#include <iostream>
#include <string>
#include <stdlib.h>
using namespace std;

int compare( const void *arg1, const void *arg2 ) {

    int n1, n2;
      
      n1 = (int) arg1;
      n2 = (int) arg2;

      if ( n1 < n2) return -1;

      if ( n1 > n2) return 1;

      return 0;
}

int ReadInt () {

    int n;
    string str;
      while (1) {

        cout << "Enter an integer: " << endl;

          getline(cin,str);

        char* pc;
            n = (int) strtol(str.c_str(),&pc,10);

            if (*pc) { // conversion error, not a valid int

                cout << "Invalid number" << endl;

            } else break; // terminate loop
      }

      return n;
}

int main () {

    int arr[10];
    int n;

      for ( int i = 0; i < 10; ++i) {

          arr[i]= ReadInt ();
      }

      qsort(arr,10,sizeof(int),compare);

      for ( i = 0; i < 10; ++i) {

          cout << arr[i] << endl;
      }
}
0

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