How can malloc an array of struct to do the following using file operation? the file is .txt input in the file is like:

10
22 3.3
33 4.4

I want to read the first line from the file and then I want to malloc an array of input structures equal to the number of lines to be read in from the file. Then I want to read in the data from the file and into the array of structures malloc. Later on I want to store the size of the array into the input variable size. return an array.After this I want to create another function that print out the data in the input variable in the same form like input file and suppose a function call clean_data will free the malloc memory at the end.

I have tried somthing like:

struct input
{
    int a;
    float b,c;

}

struct input* readData(char *filename,int *size);

int main()
{


return 0;
}

struct input* readData(char *filename,int *size)
{
    char filename[] = "input.txt";
    FILE *fp = fopen(filename, "r");

    int num;
    while(!feof(fp))
    {
        fscanf(fp,"%f", &num);
                struct input *arr = (struct input*)malloc(sizeof(struct input));

    }

}