stdin is a stream, so it isn't seekable. If you want to know its length, you must read data until you get EOF. If you need to DO something with that data, you need to store it somehow since it will be lost as you read it.
One possibility is to copy the data to a temporary file as you read it in. Then you can open this file and seek in it.
Code://try //{ if (a) do { f( b); } while(1); else do { f(!b); } while(1); //}
A simple solution would be:
Code:char buff[1024]; int len = 0; //Open the filename passed as argument int the main (argv[]) FILE *file = fopen(filename.txt, "r"); //open file while(fgets(buff, 1024, file) != NULL) { //read each line untill eof len += strlen(buff); //add the number of characters of each line } printf("Size of file is: %d\n", len); //print the size as the result
