C String Assignment

C String Assignment-4
Whereas the standard C library functions provide only simple file reading/writing, the POSIX functions add more comprehensive services, including access to filesystem metadata (e.g.modification time, who can access files), directory contents, and filesystem operations that are necessary for implementing Unix commands like in more detail later in the spec.To compare two strings, you use strcmp which returns 0 if the strings are identical or a positive number if the first string is greater, or a negative number if it is lesser.

Whereas the standard C library functions provide only simple file reading/writing, the POSIX functions add more comprehensive services, including access to filesystem metadata (e.g.modification time, who can access files), directory contents, and filesystem operations that are necessary for implementing Unix commands like in more detail later in the spec.To compare two strings, you use strcmp which returns 0 if the strings are identical or a positive number if the first string is greater, or a negative number if it is lesser.

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You may also need to convert a number to a string or a string to a number.

The atoi function converts a string to an integer value, and atof is used to convert to a floating point value, the itoa converts the integer back into a string and it also takes the base of the number, and the ftoa function is used to convert a floating point value.

For this reason, if you have debugging questions during office hours, you should make sure to gather information and explore the issue on your own first, and fill out the Queue Status questions with this information.

For instance, if your program is failing in certain cases, find a small replicable test case where the program fails; then, use GDB/Valgrind to narrow down to what function/code block/etc.

This information is essential for the course staff to effectively help you with debugging.

In this assignment, you will write code that interacts with the Unix filesystem and something called shell environment variables.

If you need an introduction or refresher on the filesystem, review our Resources page for tutorials on the tree structure, absolute and relative paths, and various commands to interact with files and directories as a user.

The POSIX standards establish a set of C functions for interacting with the operating system.

C uses templates and operator overloading to provide a string class that acts much more like a built in string type.

If you need help using strings in C we can program the assignment using the library methods or providing alternatives where no library function exists.

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