"Using fscanf() for arbitrary string input is potentially dangerous as there is limited bounds checking. We must store the input value from the file into a string (character array), but if the file or line contains more characters than the array can accommodate we may have a buffer overflow. A better way to read input is to use fgets() which allows us to limit the number of bytes that are read.\n\nchar *fgets(char *s, int size, FILE *stream);\n\nThe first argument is the string that the input data will be read into. The second parameter is how we limit the number of characters that will be read. It actually reads in one fewer character, size-1 to account for the null-terminating character which fgets() automatically inserts for us. The last argument is the file pointer that we wish to read from. The behavior of fgets() is that it reads up to size-1 characters from the input file and places the results into s. If fgets() encounters either an EOF symbol or an endline character, '\n\n' it stops reading. In the case of an endline character, it is included in the result and may need to be chomped out (that is, removed).\n\nThe fgets() function can be used to process a file line by line until the end of the file is reached. Each line can be processed (perhaps tokenized) individually to extract particular pieces of data. This is typically how a CSV or similar file may be processed. To determine if the end of the file has been reached, you can use the return value of the function: it returns NULL when no more characters have been read.\n\nFILE *input = fopen(\"data.txt\", \"r\");\n\n//this assumes that no line is more than 999 characters\n\nchar line[1000];"