Question

write a function called readAny having the following declaration:

void readAny(fstream &iofile, char buffer[], int size, int start, int index);

with five parameters, iofile is the fstream variable for reading the file. Assume that the file has already been opened. buffer is the character array for returning the bytes that will be read in by the function. size specifies how many bytes to read in. start will have one of three constants 1, 2, or 3. 1 means from the beginning, 2 means from the current position, and 3 means from the end. index specifies the index location to read from relative to what is specified in start. for example, readAny(iofile, buffer[], 20, 3, 45) will read in 20 bytes starting from location 45 from the end into the character array buffer

Answer 1

I have written function which exactly solves your question. I have included comments to each line to understand better. If you are satisfied with the answer please like. If you have any doubts please comment.

CODE:

void readAny(fstream &iofile, char buffer[], int size, int start, int index)
{
//start = 1 represents read file from beginning
if(start==1) iofile.seekg(index, ios::beg);
//start = 2 represents read file from current position
else if(start==2) iofile.seekg(index, ios::cur);
//start = 3 represents read file from the end
else if(start==3) iofile.seekg(index, ios::end);

//read size length from the file into buffer
iofile.read(buffer, size);
//ending the buffer with a null terminating character
buffer[size] = 0;
}