#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* ------------------------------------------------------------ */
/* Date struct for proper date handling */
/* ------------------------------------------------------------ */
typedef struct {
int year;
int month;
int day;
} Date;
/* ------------------------------------------------------------ */
/* File entry struct */
/* ------------------------------------------------------------ */
typedef struct {
char name[32]; /* file name without extension */
char extension[8]; /* extension including dot */
Date date; /* real date struct */
int size; /* bytes */
} FileEntry;
/* ------------------------------------------------------------ */
/* Helper: print a date in YYYY-MM-DD format */
/* ------------------------------------------------------------ */
void formatDate(const Date* d, char* buffer, size_t bufferSize) {
snprintf(buffer, bufferSize, "%04d-%02d-%02d", d->year, d->month, d->day);
}
/* ------------------------------------------------------------ */
/* Sort by name (lexicographically) */
/* ------------------------------------------------------------ */
int compareByName(const void* a, const void* b) {
const FileEntry* fa = (const FileEntry*)a;
const FileEntry* fb = (const FileEntry*)b;
return strcmp(fa->name, fb->name);
}
void sortByName(FileEntry* files, size_t count) {
qsort(files, count, sizeof(FileEntry), compareByName);
}
/* ------------------------------------------------------------ */
/* Sort by extension (lexicographically) */
/* ------------------------------------------------------------ */
int compareByExtension(const void* a, const void* b) {
const FileEntry* fa = (const FileEntry*)a;
const FileEntry* fb = (const FileEntry*)b;
return strcmp(fa->extension, fb->extension);
}
void sortByExtension(FileEntry* files, size_t count) {
qsort(files, count, sizeof(FileEntry), compareByExtension);
}
/* ------------------------------------------------------------ */
/* Sort by date (year → month → day) */
/* ------------------------------------------------------------ */
int compareByDate(const void* a, const void* b) {
const FileEntry* fa = (const FileEntry*)a;
const FileEntry* fb = (const FileEntry*)b;
if (fa->date.year != fb->date.year)
return (fa->date.year < fb->date.year) ? -1 : 1;
if (fa->date.month != fb->date.month)
return (fa->date.month < fb->date.month) ? -1 : 1;
if (fa->date.day != fb->date.day)
return (fa->date.day < fb->date.day) ? -1 : 1;
return 0;
}
void sortByDate(FileEntry* files, size_t count) {
qsort(files, count, sizeof(FileEntry), compareByDate);
}
/* ------------------------------------------------------------ */
/* Sort by size (ascending) */
/* ------------------------------------------------------------ */
int compareBySize(const void* a, const void* b) {
const FileEntry* fa = (const FileEntry*)a;
const FileEntry* fb = (const FileEntry*)b;
if (fa->size < fb->size) return -1;
if (fa->size > fb->size) return 1;
return 0;
}
void sortBySize(FileEntry* files, size_t count) {
qsort(files, count, sizeof(FileEntry), compareBySize);
}
/* ------------------------------------------------------------ */
/* Helper: print file list */
/* ------------------------------------------------------------ */
void printFiles(const FileEntry* files, size_t count) {
char dateBuf[16];
size_t i;
for (i = 0; i < count; ++i) {
formatDate(&files[i].date, dateBuf, sizeof(dateBuf));
printf("%s%s %s %d bytes\n",
files[i].name,
files[i].extension,
dateBuf,
files[i].size);
}
printf("\n");
}
int main(void) {
FileEntry files[] = {
{"G1zTo5jJk", ".jpg", {2007, 7, 8}, 51954},
{"LTEE4SI0j", ".jpg", {2011, 11, 13}, 43442},
{"PDqmuO3GH", ".cpp", {2004, 5, 21}, 3346},
{"qJO2qjukZ", ".png", {2010, 8, 27}, 67087},
{"HqclTqxb4", ".cpp", {2020, 9, 5}, 70531},
{"imVyTyoaF", ".jpg", {2011, 3, 19}, 43846},
{"rXwXdy8XO", ".txt", {2017, 10, 12}, 70193},
{"9Z4fbOBUc", ".pdf", {2004, 6, 9}, 1754},
{"ZHahuu4vS", ".txt", {2003, 10, 10}, 65126},
{"0SnZHh2GT", ".png", {2006, 10, 18}, 25890}
};
size_t count = sizeof(files) / sizeof(files[0]);
printf("Original:\n");
printFiles(files, count);
printf("Sorted by name:\n");
sortByName(files, count);
printFiles(files, count);
printf("Sorted by extension:\n");
sortByExtension(files, count);
printFiles(files, count);
printf("Sorted by date:\n");
sortByDate(files, count);
printFiles(files, count);
printf("Sorted by size:\n");
sortBySize(files, count);
printFiles(files, count);
return 0;
}
/*
run:
Original:
G1zTo5jJk.jpg 2007-07-08 51954 bytes
LTEE4SI0j.jpg 2011-11-13 43442 bytes
PDqmuO3GH.cpp 2004-05-21 3346 bytes
qJO2qjukZ.png 2010-08-27 67087 bytes
HqclTqxb4.cpp 2020-09-05 70531 bytes
imVyTyoaF.jpg 2011-03-19 43846 bytes
rXwXdy8XO.txt 2017-10-12 70193 bytes
9Z4fbOBUc.pdf 2004-06-09 1754 bytes
ZHahuu4vS.txt 2003-10-10 65126 bytes
0SnZHh2GT.png 2006-10-18 25890 bytes
Sorted by name:
0SnZHh2GT.png 2006-10-18 25890 bytes
9Z4fbOBUc.pdf 2004-06-09 1754 bytes
G1zTo5jJk.jpg 2007-07-08 51954 bytes
HqclTqxb4.cpp 2020-09-05 70531 bytes
LTEE4SI0j.jpg 2011-11-13 43442 bytes
PDqmuO3GH.cpp 2004-05-21 3346 bytes
ZHahuu4vS.txt 2003-10-10 65126 bytes
imVyTyoaF.jpg 2011-03-19 43846 bytes
qJO2qjukZ.png 2010-08-27 67087 bytes
rXwXdy8XO.txt 2017-10-12 70193 bytes
Sorted by extension:
HqclTqxb4.cpp 2020-09-05 70531 bytes
PDqmuO3GH.cpp 2004-05-21 3346 bytes
G1zTo5jJk.jpg 2007-07-08 51954 bytes
LTEE4SI0j.jpg 2011-11-13 43442 bytes
imVyTyoaF.jpg 2011-03-19 43846 bytes
9Z4fbOBUc.pdf 2004-06-09 1754 bytes
0SnZHh2GT.png 2006-10-18 25890 bytes
qJO2qjukZ.png 2010-08-27 67087 bytes
ZHahuu4vS.txt 2003-10-10 65126 bytes
rXwXdy8XO.txt 2017-10-12 70193 bytes
Sorted by date:
ZHahuu4vS.txt 2003-10-10 65126 bytes
PDqmuO3GH.cpp 2004-05-21 3346 bytes
9Z4fbOBUc.pdf 2004-06-09 1754 bytes
0SnZHh2GT.png 2006-10-18 25890 bytes
G1zTo5jJk.jpg 2007-07-08 51954 bytes
qJO2qjukZ.png 2010-08-27 67087 bytes
imVyTyoaF.jpg 2011-03-19 43846 bytes
LTEE4SI0j.jpg 2011-11-13 43442 bytes
rXwXdy8XO.txt 2017-10-12 70193 bytes
HqclTqxb4.cpp 2020-09-05 70531 bytes
Sorted by size:
9Z4fbOBUc.pdf 2004-06-09 1754 bytes
PDqmuO3GH.cpp 2004-05-21 3346 bytes
0SnZHh2GT.png 2006-10-18 25890 bytes
LTEE4SI0j.jpg 2011-11-13 43442 bytes
imVyTyoaF.jpg 2011-03-19 43846 bytes
G1zTo5jJk.jpg 2007-07-08 51954 bytes
ZHahuu4vS.txt 2003-10-10 65126 bytes
qJO2qjukZ.png 2010-08-27 67087 bytes
rXwXdy8XO.txt 2017-10-12 70193 bytes
HqclTqxb4.cpp 2020-09-05 70531 bytes
*/
