Vfrdtyky

So basically, in an infinite loop, i have to generate random numbers. I then have to create files in iteration where in 1st loop it's file1.txt, 2nd loop it's file2.txt and so on. We use the files to store every 1000000 random numbers generated, so file1.txt stores the 1st 1 million numbers, file2.txt stores the next 1 million and so on. But i think i messed up with the code. Can you help me?

int rng(){

    int i;

    FILE *fptr;

    int k = 0;



    char buffer[32];

    snprintf(buffer, sizeof(char) * 32, "file%i.txt", k);

    fptr=fopen(buffer, "wb");

    for(i=0; i<1000000; i++)

    {

        fprintf(fptr, "%d", (rand() * rand()) % 1000001);

    }

    fclose(fptr);

    k++;

}

You can make an endless loop using while(1) and then use a simple counter to count the number of elements in the current file.

Like:

#include <stdio.h>



#define ELEMENTS_PER_FILE 5



int main(void) {

    unsigned k = 0;

    unsigned file_number = 1;



    printf("Open file%u.txtn", file_number);



    while(1)

    {

        if (k == ELEMENTS_PER_FILE)

        {

            ++file_number;

            printf("Open file%u.txtn", file_number);

            k = 0;

        }



        ++k;

        printf("   Add random number #%u to filen", k);



    }



    return 0;

}

Output:

Open file1.txt

   Add random number #1 to file

   Add random number #2 to file

   Add random number #3 to file

   Add random number #4 to file

   Add random number #5 to file

Open file2.txt

   Add random number #1 to file

   Add random number #2 to file

   Add random number #3 to file

   Add random number #4 to file

   Add random number #5 to file

Open file3.txt

   Add random number #1 to file

   Add random number #2 to file

. . .

All you need to do is to replace the printf with the code doing what the print says.

Using a function to generate a single file, you can organize the code a little better. Like:

#include <stdio.h>



#define ELEMENTS_PER_FILE 5

#define FILES_TO_GENERATE 3



void make_file(unsigned num)

{

    int i;

    printf("Open file%u.txtn", num);

    for (i=1; i <= ELEMENTS_PER_FILE; ++i)

    {

        printf("   Add random number #%d to filen", i);

    }

    printf("Close file%u.txtn", num);

}



int main(void) {

    unsigned file_number = 1;



    while(file_number <= FILES_TO_GENERATE)  // or while(1) if you really want infinite

    {

        make_file(file_number);

        ++file_number;

    }



    return 0;

}

Output:

Open file1.txt

   Add random number #1 to file

   Add random number #2 to file

   Add random number #3 to file

   Add random number #4 to file

   Add random number #5 to file

Close file1.txt

Open file2.txt

   Add random number #1 to file

   Add random number #2 to file

   Add random number #3 to file

   Add random number #4 to file

   Add random number #5 to file

Close file2.txt

Open file3.txt

   Add random number #1 to file

   Add random number #2 to file

   Add random number #3 to file

   Add random number #4 to file

   Add random number #5 to file

Close file3.txt