Read txt file by using fread() function

In this code I am trying to read all the data from the file using the fread() function. The problem is that nothing is read in the array. How can fix the error?

#include <stdio.h>

void func(const char *srcFilePath)
{
    FILE *pFile = fopen(srcFilePath, "r");
    float daBuf[30];
   
    if (pFile == NULL)
    {
        perror(srcFilePath);
    } else {
        while (!feof(pFile)) {
            fread(daBuf, sizeof(float), 1, pFile);
        }
    }
    for (int i = 0; i < 5; i++) {
        printf(" daBuf  = %f \n", daBuf[i]);
    }
}

void main() {
    const char inputfile[] = "/home/debian/progdir/input";
    func(inputfile);
}

The input file has values like this:

1.654107,
1.621582,
1.589211,
1.557358,
1.525398,
1.493311,
1.483532,
1.483766,
1.654107,

Your file contains formatted text, so you can use fscanf.

Ensure that you are reading data into a new position in the array every iteration, and that you do not go beyond the bounds of the array.

Use the return value of fscanf to control your loop.

Notice the format string for fscanf is "%f,".

#include <stdio.h>

#define BUFMAX 32

void func(const char *srcFilePath)
{
    FILE *pFile = fopen(srcFilePath, "r");

    if (!pFile) {
        perror(srcFilePath);
        return;
    }

    float daBuf[BUFMAX];
    size_t n = 0;

    while (n < BUFMAX && 1 == fscanf(pFile, "%f,", &daBuf[n]))
        n++;

    if (ferror(pFile))
        perror(srcFilePath);

    fclose(pFile);

    for (size_t i = 0; i < n; i++)
        printf("daBuf[%zu] = %f\n", i, daBuf[i]);
}

int main(void)
{
    const char inputfile[] = "/home/debian/progdir/input";

    func(inputfile);
}

daBuf[0] = 1.654107
daBuf[1] = 1.621582
daBuf[2] = 1.589211
daBuf[3] = 1.557358
daBuf[4] = 1.525398
daBuf[5] = 1.493311
daBuf[6] = 1.483532
daBuf[7] = 1.483766
daBuf[8] = 1.654107

fread is generally intended for binary data, in which case you would open the file with the additional "b" mode.

Here is an example, if your file contained binary data:

#include <stdio.h>

#define BUFMAX 32

void func(const char *srcFilePath)
{
    FILE *pFile = fopen(srcFilePath, "rb");

    if (!pFile) {
        perror(srcFilePath);
        return;
    }

    float daBuf[BUFMAX];
    size_t n = fread(daBuf, sizeof *daBuf, BUFMAX, pFile);

    if (ferror(pFile))
        perror(srcFilePath);

    fclose(pFile);

    for (size_t i = 0; i < n; i++)
        printf("daBuf[%zu] = %f\n", i, daBuf[i]);
}

int main(void)
{
    const char inputfile[] = "/home/debian/progdir/input";

    func(inputfile);
}