从C中的.in文件读取

Question

I have been coding this c file that reads in exactly 2 integers of a line of a .in file. So far, my code looks like this:

#include <stdio.h>

void divideTwoNums()
{
    int c = 0;
    int num1 = 0;
    int num2 = 0;
    int product = 0;
    c = getchar();

    while (c != '\n' && c != ' ' && c != '\t')
    {
        num1 = 10 * num1 + (c - '0');
        c = getchar();
    }
    c = getchar();
    while (c != '\n' && c != ' ' && c != '\t')
    {
        num2 = 10 * num2 + (c - '0');
        c = getchar();
    }
    product = num1 / num2;
    printf("%d / %d = %d\n", num1, num2, product);
}
int main(void)
{
    divideTwoNums();
    return 0;
}

When I try this code on a .in file like this:

96 16

My .out file reads like this:

96 / 16 = 6

So, I know I am doing something right because the code worked for one line. However, I am stuck when it comes to multiple lines. Let's say my .in file reads like this:

96 16
50 10

My code won't work because I do not have a while loop, within the divideTwoNums method, that helps me get to a next sentence. Now, I tried various stuff but they were to no avail. Can you guys help me out?

edit:

Answer 1

There are couple of issues you need to deal with:

1. Using a loop to divide the numbers for more lines.
2. Figuring out when to exit the loop, ie detecting when there is no more input.

You can accomplish the first one by using a while loop in main .

int main(void)
{
    while ( 1 )
    {
       divideTwoNums();
    }
    return 0;
}

To detect that there is no input, you have do couple of things.

1. Check the return value of getchar() . If the return value is EOF, there is no more input.

2. Return a value from divideTwoNums() to indicate that there is no more input.

Here's a skeletal update to the function. I am assuming you can complete the rest.

// The return value needs to be int instead of void.
int divideTwoNums()
{
   ...

   c = getchar();
   if ( c == EOF )
   {
      // Return 0 to indicate to stop the loop.
      return 0;
   }

   ...

   // Return 1 to indicate to continue with the loop.
   return 1;
}

and change main to:

int main(void)
{
    int cont = 1;
    while ( cont )
    {
       cont = divideTwoNums();
    }
    return 0;
}