IN C LANGUAGE 16.15 Lab 5: filter
Name this program filter. c.
The program takes two command line arguments: the name of an input file and the name of an output file. The program should confirm the input and output files can be opened. If a file cannot be opened, print the error message Cannot open file '' where is the name of the file and return.
fopen() will return 0 if it fails to open a file.
Then, the program will read the file string by string (up to 50 characters in length). If the string consists of only uppercase and lowercase characters, print it.
You can use isalpha(char) declared in ctype. h to check whether a character is a-z or A-Z.
continue and break might be useful.
Don't forget to close your files!
Examples
./a. out example. txt output. txt
example. txt output. txt
The Quick Brown Fox Jumps over the Lazy The Quick Brown Fox Jumps
Old Dog. ALABAMA? over the Lazy Old Roll
Roll Tide!!! P2P 1831 (UA)
./a. out does_not_exist. txt output. txt
Cannot open file 'does_not_exist. txt'