Improving Input/Output in C

Using argc and argv, Detecting Errors, Standard I/O Devices, I/O Redirection

Presenter's Name

Using argc and argv

Explanation of command-line arguments

argc (number of arguments) and argv (array of pointers to strings)

Illustration with the example: filecopy PR1.C PR2.C

Checking for the correct number of arguments in main()

Improved File-Copy Program

Code example for an improved file-copy program

Eliminating the need to recompile for each use

Accepting source and target file names as arguments

Using argc and argv in the program

Compact Loop

A more compact way to write the copy loop

Avoiding indefinite loops and break statements

Using fgetc and fputc in a single line

Detecting Errors

Introduction to error detection during file operations

The use of ferror() function to report errors

Code example for checking and handling errors

Standard I/O Devices

Explanation of standard input (stdin) and standard output (stdout)

How to use these pointers for input and output

Not requiring fopen() and fclose() for standard I/O

I/O Redirection

Introduction to I/O redirection

Using redirection to send program output to a file

Example with the > operator

Verification using the TYPE command

Redirecting Input

Redirecting input from a file

Using < operator to change the input source

Example with the UTIL.EXE program

Both Ways at Once

Combining input and output redirection

The use of filters

Example with input from NEWPOEM.TXT and output to POETRY.TXT

Conclusion

Summary of key points

Highlights of using command-line arguments, standard I/O, and I/O redirection

Potential for developing utility programs with redirection