ex05-05.c

#include<unistd.h>
#include<stdio.h>
#include<stdlib.h>

#define BUF_SIZE 256

void printcwd() {
    char buffer[BUF_SIZE];

    if (getcwd(buffer, BUF_SIZE) == NULL) {
        exit(1);
    }

    printf("%s\n", buffer);
}

int main() {
    printcwd();
    chdir("usr/include");
    printcwd();
    chdir("..");
    printcwd();
}