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added weekly exercises of isp-ws25

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This commit is contained in:
Jason Igari-Szabo
2026-04-13 19:02:19 +02:00
parent c51e836ed9
commit 00fdd31a18
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1
c/isp-ws25/weeklies/week09/quote.txt Executable file
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The first 90 minutes are the most important

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c/isp-ws25/weeklies/week09/quote_copy.txt Executable file
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The first 90 minutes are the most important

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c/isp-ws25/weeklies/week09/sentences.txt Executable file
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A forked purple lightning bolt, on black field speckled with four-pointed stars.
Can a man still be brave if he's afraid?
That is the only time a man can be brave.
What is dead may never die.
Our Sun Shines Bright.
As High as Honor.
The North remembers.
It is rare to meet a Lannister who shares my enthusiasm for dead Lannisters.
A good act does not wash out the bad, nor a bad act the good.
Each should have its own reward.
Winter is coming.
What is dead may never die.
What is dead may never die.
When you play the game of thrones, you win or you die.
A good act does not wash out the bad, nor a bad act the good.
Each should have its own reward.
More pigeon pie, please.
A forked purple lightning bolt, on black field speckled with four-pointed stars.
Words are like wind.
The wolf and the lion.
The winds of Winter.
It is rare to meet a Lannister who shares my enthusiasm for dead Lannisters.

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c/isp-ws25/weeklies/week09/w09ex01.c Executable file
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/*
In this task, you should get familiar with file I/O operations in C
by writing a program that reads the text file sentences.txt and counts
both the number of words and the number of characters (excluding line breaks).
Tasks:
- Open "sentences.txt" using fopen.
- if open fails (i.e., fopen returns NULL):
- Print the error message "Could not open file\n"
- return 1
- User Input: line number that should be analyzed
- Line numbers are 1-based (if user enters "1", analyze first line)
- Read file (e.g., using fgetc)
- analyze correct line
- Count words separated by whitespace.
- Count characters (excluding line break).
- Close file properly after processing.
- Print word count and character count according to example output below.
- If entered line number is not in range line numbers of file:
- print "Could not analyze line\n".
Examples:
Line number to analyze: 5
Word Count: 4
Character Count: 22
Line number to analyze: 1
Word Count: 12
Character Count: 80
Line number to analyze: 22
Word Count: 14
Character Count: 76
*/
#include <ctype.h>
#include <stdio.h>
#include <string.h>
int main(void)
{
printf("Line number to analyze: ");
int line_number;
scanf("%d", &line_number);
if (line_number < 1)
{
printf("Could not analyze line\n");
return 0;
}
FILE *file = fopen("sentences.txt", "r");
if (file == NULL)
{
printf("Could not open file\n");
return 1;
}
int current_line = 1;
int word_count = 0;
int char_count = 0;
int character = 0;
int saw_char = 0;
while ((character = fgetc(file)) != EOF)
{
if(current_line != line_number && character != '\n') continue;
if (character == '\n')
{
if (current_line == line_number) break;
current_line++;
continue;
}
if (current_line == line_number)
{
if (character != '\n') char_count++;
//It is rare to meet a Lannister who shares my enthusiasm for dead Lannisters.
if (isspace(character))
{
saw_char = 0;
}
else if (isgraph(character) && !saw_char)
{
word_count++;
saw_char = 1;
continue;
}
}
}
if (current_line < line_number)
{
printf("Could not analyze line\n");
}
else
{
printf("Word Count: %d\n", word_count);
printf("Character Count: %d\n", char_count);
}
fclose(file);
return 0;
}

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c/isp-ws25/weeklies/week09/w09ex02.c Executable file
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/*
In this task, you should get familiar with file manipulation in C
by performing operations like reading the file content,
moving the file cursor, and writing the predefined string
"Halftime is for the real fans" to a specific position in a file.
Your tasks are:
- Open file quote.txt in read/write mode
if fopen == NULL
- Print "Could not open file\n"
- return 1
- Print original content of file to console
- Ask user to enter a position to insert a predefined string
- move cursor to the specified position
if cannot be moved
- Print "Could not move the file cursor\n"
- return 1
- overwrite existing content (i.e. use fseek to move the cursor)
- Write the predefined string into the file using fputs
- Rewind the file to the beginning and print the updated content of the file to the console
- Close the file properly after processing.
Examples:
Original file content: The first 90 minutes are the most important
Position to insert the string: 4
Updated file content: The Halftime is for the real fans important
Original file content: The first 90 minutes are the most important
Position to insert the string: -5
Could not move the file cursor
*/
#include <stdio.h>
int main(void)
{
FILE *file = fopen("quote.txt", "r+");
if (NULL == file) {
printf("Could not open file\n");
return 1;
}
printf("Original file content: ");
int character = 0;
while ((character = fgetc(file)) != EOF)
{
printf("%c", character);
}
printf("\n");
rewind(file);
long insert_position = 0;
printf("Position to insert the string: ");
scanf("%ld", &insert_position);
if (fseek(file, insert_position, SEEK_CUR))
{
printf("Could not move the file cursor\n");
fclose(file);
return 1;
}
char* text_to_insert = "Halftime is for the real fans";
fputs(text_to_insert, file);
rewind(file);
printf("Updated file content: ");
while ((character = fgetc(file)) != EOF)
{
printf("%c", character);
}
printf("\n");
fclose(file);
return 0;
}

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c/isp-ws25/weeklies/week09/w09ex03.c Executable file
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/*
In this task, you should get familiar with enum.
The program allows the user to enter ratings for a movie
using integers that should correspond to an enum.
Only ratings between 1 and 5 are considered.
The program processes the ratings,
prints the average rating using stars (i.e., *) and
prints a recommendation based on the average ratings.
Your task is:
- Declare a typedef’d enum for the 5 categories of the rating system
- 1 == worst rating
- 5 == best rating
- all ratings are entered by the user
- calculate average rating using total_ratings and weighted_ratings
- total_ratings == total number of ratings entered by the user
- weighted_ratings == ratings weighted by their category
- ratings in 1st category: weighted with 1
- ratings in 2nd category: weighted with 3
This is necessary to calculate the average rating by dividing weighted_ratings by total_ratings
Use your typedef’d enum as data type of the variable in which you store the average ratings
Use an integer division to calculate the average rating
(e.g., an average rating of 3.84 corresponds to the 3rd category).
Print the average rating using stars.
For instance, if the average rating of the movie is in the
3rd category of the rating system, then print Average rating: ***.
Print a recommendation based on the rating category of the movie’s average rating:
- 1st category: The movie is terrible, do not watch it
- 2nd category: The movie is bad and not worth watching
- 3rd category: The movie is average, neither especially good nor bad
- 4th category: The movie is good and worth watching
- 5th category: The movie is excellent and a must-see
- Print "Invalid rating for the movie" if none of the above cases apply.
Examples:
Enter movie ratings (1 = TERRIBLE, 2 = BAD, 3 = AVERAGE, 4 = GOOD, 5 = EXCELLENT). End with -1:
3 4 3 3 2 3 5 4 4 3 3 -1
Average rating: ***
Recommendation: The movie is average, neither especially good nor bad
Enter movie ratings (1 = TERRIBLE, 2 = BAD, 3 = AVERAGE, 4 = GOOD, 5 = EXCELLENT). End with -1:
5 4 3 4 5 4 3 4 5 4 3 5 5 5 5 5 3 3 3 -1
Average rating: ****
Recommendation: The movie is good and worth watching
*/
#include <stdio.h>
#define MAX_RATING 5
// TODO: Declare a (typedef'd) enum for a movie rating scale that consists of 5 categories
typedef enum _Ratings_ {
TERRIBLE = 1,
BAD,
AVERAGE,
GOOD,
EXCELLENT
} Ratings;
void giveRecommendation(Ratings rating)
{
printf("Recommendation: ");
switch (rating) {
case TERRIBLE:
printf("The movie is terrible, do not watch it\n");
break;
case BAD:
printf("The movie is bad and not worth watching\n");
break;
case AVERAGE:
printf("The movie is average, neither especially good nor bad\n");
break;
case GOOD:
printf("The movie is good and worth watching\n");
break;
case EXCELLENT:
printf("The movie is excellent and a must-see\n");
break;
default:
printf("Invalid rating for the movie\n");
break;
}
}
int main(void)
{
printf("Enter movie ratings (1 = TERRIBLE, 2 = BAD, 3 = AVERAGE, 4 = GOOD, 5 = EXCELLENT). End with -1:\n");
int input = 0;
int ratings[MAX_RATING] = {0};
while (1)
{
scanf("%d", &input);
if (input == -1) break;
if (input > 0 && input <= MAX_RATING)
{
ratings[--input]++;
}
}
int total_ratings = 0;
int weighted_ratings = 0;
for (int i = 0; i < sizeof(ratings)/sizeof(ratings[0]); i++)
{
total_ratings += ratings[i];
weighted_ratings += (ratings[i] * (i+1));
}
if (total_ratings == 0)
{
printf("No ratings entered\n");
return 1;
}
// TODO: Store the average rating in a variable. The data type of the variable should be your typedef'd enum
Ratings average_rating = weighted_ratings / total_ratings;
// TODO: Print the average rating by displaying stars
printf("Average rating: ");
for(int i = 0; i < average_rating; i++) printf("%c", '*');
printf("\n");
// TODO: Print the recommendation
giveRecommendation(average_rating);
return 0;
}