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Add comments, remove unnecessary code

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This commit is contained in:
Jiří Štefka 2022-12-06 03:13:15 +01:00
parent 7c9f031106
commit 8e74944ca2
1 changed files with 114 additions and 35 deletions
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131
01/src/main.c
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@ -8,14 +8,22 @@ struct elf {
int *calories;
};
// Gets the number of elves in the input file.
int get_num_of_elves(const char *fileName) {
// Max line length
char line[300];
// Stores the number of empty lines (elves)
int emptyLine = 0;
// Open the file
FILE *fp = fopen(fileName, "r");
// Check if the file opened successfully
if (fp == NULL) {
printf("Error: Could not open specified file!\n");
return -1;
} else {
}
// Read the file and count blank lines
while (fgets(line, 300, fp)) {
int i = 0;
int len = strlen(line);
@ -27,41 +35,76 @@ int get_num_of_elves(const char *fileName) {
}
}
}
fclose(fp);
return ++emptyLine;
// Check if the last line in the file is empty
if (line[0] == '\n') {
emptyLine--;
}
// Close the file
fclose(fp);
// Return the number of elves (one elf won't be counted if there is a blank line at the end of the file)
return ++emptyLine;
}
/*
* Loads the elve's carried calories from the input file.
* Params:
* - int num_of_elves: The number of elves in the input file.
* - const char *fileName: The name of the input file.
* - struct elf *elves: The array of elves to store the data in.
*/
void load_data(int num_of_elves, char *filename, struct elf **arr) {
// Open the file
FILE *fp = fopen(filename, "r");
// Check if the file opened successfully
if (fp == NULL) {
printf("Error: Could not open specified file!\n");
return;
}
// Go through each elf
for (int i = 0; i < num_of_elves; i++) {
// Count number of lines until blank line
int num_of_lines = 0;
// Stores the current line (max length 300)
char line[300];
/*
* NOTE: The code below is used to get the number of items does the elf have
* so that the memory can be allocated corretly. But then wee need to go back
* to the start of the elve's data and we need the number of characters we read
* to do that
*/
// Counts the number of characters
int char_count = 0;
// Go through the elve's data
while (fgets(line, 300, fp)) {
int i = 0;
// Length of the current line
int len = strlen(line);
// Update character count
char_count += len;
for (i = 0; i < len; i++) {
// Go through the line until a new line character is found
for (int i = 0; i < len; i++) {
if (line[i] != '\n' && line[i] != '\t' && line[i] != ' ') {
num_of_lines++;
break;
}
}
// Check if the line is empty
if (line[0] == '\n') {
break;
}
}
// Check for blank line at EOF
if(line[0] == EOF) {
// Check for blank line at EOF (or you'll get an infinit loop if the last line is blank LOL)
if (line[0] == EOF) {
break;
}
// If the line is empty, go back to the start of the next elve
if (num_of_lines == 0) {
i--;
continue;
@ -70,98 +113,134 @@ void load_data(int num_of_elves, char *filename, struct elf **arr) {
// Go back to start of current elf's data
fseek(fp, -char_count, SEEK_CUR);
// Reference the array
struct elf *data = *arr;
// Allocate memory for array
data[i].size = num_of_lines;
data[i].calories = malloc(num_of_lines * sizeof(int));
// Remember how many calories are stored
data[i].size = num_of_lines;
// Load the data
for (int j = 0; j < num_of_lines; j++) {
// Read the line ans add the calories to the correct elf in the array
int res = fscanf(fp, "%d", &data[i].calories[j]);
if (res != 1){
// Check if the line has the correct formatting
if (res != 1) {
printf("Error, bad file format!");
return;
}
}
}
// Close the file
fclose(fp);
}
void count_elf_calories(struct elf **arr, int num_of_elves){
// Count all the calories each elf has
// Params:
// - int num_of_elves: The number of elves in the input file.
// - struct elf *elves: The array with the data.
void count_elf_calories(struct elf **arr, int num_of_elves) {
// Reference the array
struct elf *data = *arr;
for (int i = 0; i < num_of_elves; i++){
// Go through each elf
for (int i = 0; i < num_of_elves; i++) {
// Sum of the callories for the current elf
int sum = 0;
for (int j = 0; j < data[i].size; j++){
// Go through the elve's calories
for (int j = 0; j < data[i].size; j++) {
// Add the calories to the sum
sum += data[i].calories[j];
// Remove the callories and decrease the stored calories number
data[i].calories[j] = 0;
}
// Set the sum to indes 0
data[i].calories[0] = sum;
data[i].size = 1;
}
}
// Argument parser
char *argv_parser(int argc, char *argv[]) {
// This program has only one argument
if (argc != 2) {
fprintf(stderr, "Usage: %s <filename>\n", argv[0]);
return NULL;
}
// Return the argument as pos 1 (the filename)
return argv[1];
}
int main(int argc, char *argv[]) {
// The array of elves
struct elf *arr;
// Get the filename
char *filename = argv_parser(argc, argv);
if (filename == NULL) {
return 1;
}
// Get the number of elves in the file
int num_of_elves = get_num_of_elves(filename);
// Check if the operation was successful
if (num_of_elves == -1) {
return 1;
}
// Alocate the memory for the array
arr = malloc(num_of_elves * sizeof(struct elf));
// Load all the elve's calorias
load_data(num_of_elves, filename, &arr);
// Count all the calories each elf has
count_elf_calories(&arr, num_of_elves);
// Print 3 elfs carrying the most calories
// Get 3 elves with the most calories
int first_elf_cal = 0;
int first_elf_idx = 0;
int second_elf_cal = 0;
int second_elf_idx = 0;
int third_elf_cal = 0;
int third_elf_idx = 0;
for (int i = 0; i < num_of_elves; i++){
if (arr[i].calories[0] > first_elf_cal){
for (int i = 0; i < num_of_elves; i++) {
// If the elf has more calories than others, move the other elves down
if (arr[i].calories[0] > first_elf_cal) {
third_elf_cal = second_elf_cal;
third_elf_idx = second_elf_idx;
second_elf_cal = first_elf_cal;
second_elf_idx = first_elf_idx;
first_elf_cal = arr[i].calories[0];
first_elf_idx = i;
} else if (arr[i].calories[0] > second_elf_cal){
} else if (arr[i].calories[0] > second_elf_cal) {
third_elf_cal = second_elf_cal;
third_elf_idx = second_elf_idx;
second_elf_cal = arr[i].calories[0];
second_elf_idx = i;
} else if (arr[i].calories[0] > third_elf_cal){
} else if (arr[i].calories[0] > third_elf_cal) {
third_elf_cal = arr[i].calories[0];
third_elf_idx = i;
}
}
printf("Elf %d carries the most calories at %d calories\n", first_elf_idx, first_elf_cal);
printf("Elf %d carries the second most calories at %d calories\n", second_elf_idx, second_elf_cal);
printf("Elf %d carries the third most calories at %d calories\n", third_elf_idx, third_elf_cal);
// Print out the 3 elves with the most calories
printf("Elf %d carries the most calories at %d calories\n", first_elf_idx,
first_elf_cal);
printf("Elf %d carries the second most calories at %d calories\n",
second_elf_idx, second_elf_cal);
printf("Elf %d carries the third most calories at %d calories\n",
third_elf_idx, third_elf_cal);
// Print the top 3 elves with the most calories
printf("The top 3 elves carry %d calories\n", first_elf_cal + second_elf_cal + third_elf_cal);
printf("The top 3 elves carry %d calories\n",
first_elf_cal + second_elf_cal + third_elf_cal);
// Free memory
for (int i = 0; i < num_of_elves; i++){
for (int i = 0; i < num_of_elves; i++) {
free(arr[i].calories);
}
// Free the array
free(arr);
return 0;
}