Thread: Reading in a string from an input file?

In short what I am trying to do now is successfully read in a the first name on the list and print it out. The way my code is now, it seems like its reading the first and last initial and then continuing on to the lottery ticket numbers (since my loop is suppose to increment 19 times).

So you want to scanf() in the first number:

Code:

int num, i, j tick[100][6];  //or malloc the size later 

scanf("%d", &num);

//and then
for(i=0;i<num;i++) {
  fgets(full_name, sizeof(full_name), ifp); //get both names
  for(j=0;j<6;j++)
    scanf("%d, &tick[j]); 
}

/* in your processing, only go to < i */

something like that?

Do you need to save each name? maybe in a 2D string array?

YES... I need to save each name and if three or more of there number matches the winning lottery numbers I need to print out their names and their winnings.

Originally Posted by hk_mp5kpdw

Not addressing the OPs problem, but this is problematic:

Code:

int lottery_num [5], num_tickets, i,z;

...

printf("Please enter the winning lottery numbers.\n");
for(i=0; i<6; i++){
    scanf("%d", &lottery_num[i]);
}

The array has 5 valid indexes from 0-4 but the loop goes from 0-5.

Also:

I believe this is problematic:

Code:

for(z=0; z<19; z++){
fscanf(ifp, "%s", &full_name[z]);

0-18 is 19 indexes, you said you had to read 20.

As for your issue, if you need to save each name, a 2D array would suit you well.

Code:

char all_names[5][20];
int lottery_numbers[5][5]
for (int i = 0 ; i < 5 ; ++i)
{
   scanf("%s", all_names[i];
   for (int j = 0 ; j < 5 ; ++j)
   {
      scanf("%d", lottery_numbers[i][j];
   }
}

I don't typically use scanf, but you get the idea.

So if you have a 5x20 char array (5 people, 20 char per name), and then a "parallel" 2D array, that's 5x5 (5 people, 5 lottery numbers), you can load them at once.

concept is:

Code:

(looping over people)
   (add their name to the names array)
   (looping over their numbers)
      (add their numbers to the numbers array)
   (end looping over their numbers)
(end looping over the people)

Now what you have names:
ie.

Code:

printf("%s", all_names[0]); // prints 1st person's name
printf("%s", all_names[1]); // prints 2nd person's name

And their numbers:
ie.

Code:

printf("%i", lottery_numbers[0][0]); // prints 1st person's 1st number
printf("%i", lottery_numbers[0][1]); // prints 1st person's 2nd number
printf("%i", lottery_numbers[0][2]); // prints 1st person's 3rd number
printf("%i", lottery_numbers[4][3]); // prints 5th person's 4th number

I hope that makes some sense to you .