Thread: ReadData txt file

Don't use feof in the control of a loop - i.e. That while loop.

Here is another FAQ explaining why...
Question 12.2

Hi I appreciate your guys your effort to help me.
my problem is this:
I want to read the data from txt file line by line which that data is like this pattern:
when the length of the data line of the txt file is three numbers as passing those three numbers(integers) to fun1 .
when the length of the data line of the txt file is two numbers as passing those two numbers (integers) to func2.
when the length of the data of the line of txt file is one number as passing one number to fun3.

for example if i have txt file like this:

1 2 3
3 4 5
3 4
2
4 5 6
then I want like this to do:
first line goes with its parameters to func1(int x=1,int y=2,int z=3)
second line goes with its parameters to func1(3,4,5)
third line goes with its parameters to func2(3,4)
fourth line goes with its parameters to func3(2)
fifth line goes with its parameters to func1(4,5,6);

any clue how can I start? I tried the code that already posted here but didn't work well.
there's no specified pattern for the number of integers in line, it might be one integer in line or two integer in line or three integers in line. (max three integer in line)

I tried also to pick up line by line as string and split it up but didn't work!


thanks alot

Originally Posted by laserlight

Isn't that wrong, though? fgets returns a pointer to char, not an int, hence Salem's original implicit test for a non-null pointer is correct.

You are absolutely RIGHT! Sorry...
The snippet was edited....

Originally Posted by laserlight

Isn't that wrong, though? fgets returns a pointer to char, not an int, hence Salem's original implicit test for a non-null pointer is correct.

Hi laser, I appreciate your help, and thanks for clarifications. also thanks for flp to make an effort.

I'm still stuck in and I tried many methods like getting line by line as string and splitting it to get every "number" and afterwards converting it by atoi function .. sounds horrible but didn't help me because I always arrive to null pointer error and have many errors in that method.
I tried the method that I declared here before but didn't help.

May you help me please how can I solve the problem? thanks alot.

Originally Posted by Salem

> char line[100000000];
What are you smoking!?

Pick a reasonable size, like BUFSIZ

100MB FFS
Sheesh!

it's not working either!
I changed to 100MB it, it runs and there's not output, it's just running and at the end tell me in command line : Process finished with exit code -1073741571 (0xC00000FD)

[code]

Code:

int main()
{
    int v1, v2, v3;
    char line[104857600];
    FILE *file = fopen("FILE.txt", "r");
    if (file != NULL)
    {
        /* or other suitable maximum line size */
        while (fgets(line, sizeof line, file) != NULL)
        {
            if (sscanf(line, "%d %d %d", &v1, &v2, &v3) == 3)
            {
                printf("%d %d %d\n", v1, v2, v3);
            } else if (sscanf(line, "%d %d", &v1, &v2) == 2) {
                printf("%d %d %d\n", v1, v2);
            } else if (sscanf(line, "%d", &v1) == 1) {
                printf("%d\n", v1);
            }
        }
    }
    else
        {
        printf("error file openning");
    }
    return 0;
}

Originally Posted by Salem

Stop being an idiot, and make a decent buffer size.

Hi salem, I've done this code

Code:

int main()
{
    int v1, v2, v3;
    char line[10000];
    FILE *file = fopen("FILE.txt", "r");
    if (file != NULL)
    {
        /* or other suitable maximum line size */
        while (fgets(line, sizeof line, file) != NULL)
        {
            if (sscanf(line, "%d %d %d", &v1, &v2, &v3) == 3)
            {
                printf("%d %d %d\n", v1, v2, v3);
            } else if (sscanf(line, "%d %d", &v1, &v2) == 2) {
                printf("%d %d %d\n", v1, v2);
            } else if (sscanf(line, "%d", &v1) == 1) {
                printf("%d\n", v1);
            }
        }
    }
    else
        {
        printf("error file openning");
    }
    return 0;
}

it didn't output anything , I'm not kidding !