gets() Problem

The read_integer function in the code below is weird. The first time the program runs through the loop it works just fine, taking in 2 integers and multiplying and adding them. However, if you choose to continue. It won't let you enter the first deque... It just prints out the "Please type a large integer:" and then prints it again immediately afterwards. It will allow you to enter a deque after that. I ran through it with the Debugger and it seems to be a problem with gets. But I could be wrong! Any suggestions?

Code:

---

#include <iostream>
#include <cstdio>
#include <deque>

using namespace std;


typedef deque<int> INTDEQUE;

int read_integer(INTDEQUE &, int count);
void write_integer(INTDEQUE &);
void add_integers(INTDEQUE &sum, INTDEQUE X, INTDEQUE Y);
void multiply_integers(INTDEQUE &product, INTDEQUE X, INTDEQUE Y, int count_A, int count_B);

int main(void)
{

        INTDEQUE  A,B,S,P;
        int count = 0, count2=0;
        int count_A, count_B;

        char quit = 'a';

        do{

        count_A = read_integer(A, count2);
        count_B = read_integer(B, count2);

        add_integers(S,A,B);
        multiply_integers(P,A,B, count_A, count_B);

        cout << endl;
        cout << "The first integer is: ";
        write_integer(A);
        cout << "The second integer is: ";
        write_integer(B);
        cout << "The sum is: ";
        write_integer(S);
        cout << "The product is: ";
        write_integer(P);

        printf("\nQ - Quit\nC - Continue\n");
        scanf("%c", &quit);
        }while (quit != 'Q'); 

        return 0;
}

int read_integer(INTDEQUE &X, int count2)
{
        char line[100];
        char * pline;

        printf("Please type a large integer:\n");
        gets(line);
        fflush(stdin);

        pline = line;

        while(*pline != '\0')
        {
                if (*pline >='0' && *pline <= '9')
                {
                        X.push_back(*pline -'0');
                        count2++;
                }
                pline++;
        }

        return count2;
}

---

One solution is std::getline(cin, theString).

Kuphryn

The other is to read the FAQ.

>>gets(line);
Read me

>>fflush(stdin)
Read me

In old school C++ (Turbo C++ v1.01) Using gets you need to then convert the gets string to an integer using "atoi". I don't know if that command still exists in the newer C++ compilers. (I tried to use "atoi" from one of my older programs with my new Dev C++ and it didn't recognize the command...).

Anyway, you could try it.

>>Using gets you need to then convert the gets string to an integer using "atoi".
Again, this is all in the FAQ.