added ws202425 courses

2023_CS50X/arrays/Source/ascii0.c

@@ -0,0 +1,15 @@
+// Explicitly casts chars to ints
+
+#include <cs50.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(void)
+{
+    string s = get_string("String: ");
+    for (int i = 0; i < strlen(s); i++)
+    {
+        int c = (int) s[i];
+        printf("%c %i\n", s[i], c);
+    }
+}

2023_CS50X/arrays/Source/ascii1.c

@@ -0,0 +1,14 @@
+// Implicitly casts chars to ints
+
+#include <cs50.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(void)
+{
+    string s = get_string("String: ");
+    for (int i = 0; i < strlen(s); i++)
+    {
+        printf("%c %i\n", s[i], s[i]);
+    }
+}

2023_CS50X/arrays/Source/buggy0.c

@@ -0,0 +1,11 @@
+// Buggy example for printf
+
+#include <stdio.h>
+
+int main(void)
+{
+    for (int i = 0; i <= 3; i++)
+    {
+        printf("#\n");
+    }
+}

2023_CS50X/arrays/Source/buggy1.c

@@ -0,0 +1,24 @@
+// Buggy example for debug50
+
+#include <cs50.h>
+#include <stdio.h>
+
+int get_negative_int(void);
+
+int main(void)
+{
+    int i = get_negative_int();
+    printf("%i\n", i);
+}
+
+// Prompt user for positive integer
+int get_negative_int(void)
+{
+    int n;
+    do
+    {
+        n = get_int("Negative Integer: ");
+    }
+    while (n < 0);
+    return n;
+}

2023_CS50X/arrays/Source/greet0.c

@@ -0,0 +1,10 @@
+// Uses get_string
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    string answer = get_string("What's your name? ");
+    printf("hello, %s\n", answer);
+}

2023_CS50X/arrays/Source/greet1.c

@@ -0,0 +1,10 @@
+// Uses get_string with better-named variable
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    string name = get_string("What's your name? ");
+    printf("hello, %s\n", name);
+}

2023_CS50X/arrays/Source/greet2.c

@@ -0,0 +1,16 @@
+// Prints a command-line argument
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(int argc, string argv[])
+{
+    if (argc == 2)
+    {
+        printf("hello, %s\n", argv[1]);
+    }
+    else
+    {
+        printf("hello, world\n");
+    }
+}

2023_CS50X/arrays/Source/greet3.c

@@ -0,0 +1,12 @@
+// Prints command-line arguments
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(int argc, string argv[])
+{
+    for (int i = 0; i < argc; i++)
+    {
+        printf("%s\n", argv[i]);
+    }
+}

2023_CS50X/arrays/Source/hello0.c

@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int main(void)
+{
+    printf("hello, world\n");
+}

2023_CS50X/arrays/Source/hello1.c

@@ -0,0 +1,8 @@
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    string name = get_string("What's your name? ");
+    printf("hello, %s\n", name);
+}

2023_CS50X/arrays/Source/hi0.c

@@ -0,0 +1,12 @@
+// Prints chars
+
+#include <stdio.h>
+
+int main(void)
+{
+    char c1 = 'H';
+    char c2 = 'I';
+    char c3 = '!';
+
+    printf("%c%c%c\n", c1, c2, c3);
+}

2023_CS50X/arrays/Source/hi1.c

@@ -0,0 +1,12 @@
+// Prints chars' ASCII codes
+
+#include <stdio.h>
+
+int main(void)
+{
+    char c1 = 'H';
+    char c2 = 'I';
+    char c3 = '!';
+
+    printf("%i %i %i\n", c1, c2, c3);
+}

2023_CS50X/arrays/Source/hi2.c

@@ -0,0 +1,10 @@
+// Prints string
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    string s = "HI!";
+    printf("%s\n", s);
+}

2023_CS50X/arrays/Source/hi3.c

@@ -0,0 +1,10 @@
+// Prints string's ASCII codes
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    string s = "HI!";
+    printf("%i %i %i\n", s[0], s[1], s[2]);
+}

2023_CS50X/arrays/Source/hi4.c

@@ -0,0 +1,10 @@
+// Prints string's ASCII codes, including NUL
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    string s = "HI!";
+    printf("%i %i %i %i\n", s[0], s[1], s[2], s[3]);
+}

2023_CS50X/arrays/Source/hi5.c

@@ -0,0 +1,13 @@
+// Multiple strings
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    string s = "HI!";
+    string t = "BYE!";
+
+    printf("%s\n", s);
+    printf("%s\n", t);
+}

2023_CS50X/arrays/Source/hi6.c

@@ -0,0 +1,15 @@
+// Array of strings
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    string words[2];
+
+    words[0] = "HI!";
+    words[1] = "BYE!";
+
+    printf("%s\n", words[0]);
+    printf("%s\n", words[1]);
+}

2023_CS50X/arrays/Source/hi7.c

@@ -0,0 +1,14 @@
+#include <cs50.h>
+#include <stdio.h>
+
+
+int main(void)
+{
+    string words[2];
+
+    words[0] = "HI!";
+    words[1] = "BYE!";
+
+    printf("%c%c%c\n", words[0][0], words[0][1], words[0][2]);
+    printf("%c%c%c%c\n", words[1][0], words[1][1], words[1][2], words[1][3]);
+}

2023_CS50X/arrays/Source/length0.c

@@ -0,0 +1,18 @@
+// Determines the length of a string
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Prompt for user's name
+    string name = get_string("Name: ");
+
+    // Count number of characters up until '\0' (aka NUL)
+    int n = 0;
+    while (name[n] != '\0')
+    {
+        n++;
+    }
+    printf("%i\n", n);
+}

2023_CS50X/arrays/Source/length1.c

@@ -0,0 +1,25 @@
+// Determines the length of a string using a function
+
+#include <cs50.h>
+#include <stdio.h>
+
+int string_length(string s);
+
+int main(void)
+{
+    // Prompt for user's name
+    string name = get_string("Name: ");
+    int length = string_length(name);
+    printf("%i\n", length);
+}
+
+int string_length(string s)
+{
+    // Count number of characters up until '\0' (aka NUL)
+    int n = 0;
+    while (s[n] != '\0')
+    {
+        n++;
+    }
+    return n;
+}

2023_CS50X/arrays/Source/length2.c

@@ -0,0 +1,13 @@
+// Determines the length of a string using a function
+
+#include <cs50.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(void)
+{
+    // Prompt for user's name
+    string name = get_string("Name: ");
+    int length = strlen(name);
+    printf("%i\n", length);
+}

2023_CS50X/arrays/Source/scores0.c

@@ -0,0 +1,14 @@
+// Averages three (hardcoded) numbers
+
+#include <stdio.h>
+
+int main(void)
+{
+    // Scores
+    int score1 = 72;
+    int score2 = 73;
+    int score3 = 33;
+
+    // Print average
+    printf("Average: %f\n", (score1 + score2 + score3) / 3.0);
+}

2023_CS50X/arrays/Source/scores1.c

@@ -0,0 +1,16 @@
+// Averages three (hardcoded) numbers using an array
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Scores
+    int scores[3];
+    scores[0] = 72;
+    scores[1] = 73;
+    scores[2] = 33;
+
+    // Print average
+    printf("Average: %f\n", (scores[0] + scores[1] + scores[2]) / 3.0);
+}

2023_CS50X/arrays/Source/scores2.c

@@ -0,0 +1,16 @@
+// Averages three numbers using an array
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Get scores
+    int scores[3];
+    scores[0] = get_int("Score: ");
+    scores[1] = get_int("Score: ");
+    scores[2] = get_int("Score: ");
+
+    // Print average
+    printf("Average: %f\n", (scores[0] + scores[1] + scores[2]) / 3.0);
+}

2023_CS50X/arrays/Source/scores3.c

@@ -0,0 +1,17 @@
+// Averages three numbers using an array and a loop
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Get scores
+    int scores[3];
+    for (int i = 0; i < 3; i++)
+    {
+        scores[i] = get_int("Score: ");
+    }
+
+    // Print average
+    printf("Average: %f\n", (scores[0] + scores[1] + scores[2]) / 3.0);
+}

2023_CS50X/arrays/Source/scores4.c

@@ -0,0 +1,35 @@
+// Averages three numbers using an array, a constant, and a helper function
+
+#include <cs50.h>
+#include <stdio.h>
+
+// Constant
+const int N = 3;
+
+// Prototype
+float average(int length, int array[]);
+
+int main(void)
+{
+    // Get scores
+    int scores[N];
+    for (int i = 0; i < N; i++)
+    {
+        scores[i] = get_int("Score: ");
+    }
+
+    // Print average
+    printf("Average: %f\n", average(N, scores));
+}
+
+float average(int length, int array[])
+{
+    // Calculate average
+    int sum = 0;
+    for (int i = 0; i < length; i++)
+    {
+        sum += array[i];
+    }
+    return sum / (float) length;
+}
+

2023_CS50X/arrays/Source/status.c

@@ -0,0 +1,15 @@
+// Returns explicit value from main
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(int argc, string argv[])
+{
+    if (argc != 2)
+    {
+        printf("Missing command-line argument\n");
+        return 1;
+    }
+    printf("hello, %s\n", argv[1]);
+    return 0;
+}

2023_CS50X/arrays/Source/string0.c

@@ -0,0 +1,16 @@
+// Prints string char by char, using strlen
+
+#include <cs50.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(void)
+{
+    string s = get_string("Input:  ");
+    printf("Output: ");
+    for (int i = 0; i < strlen(s); i++)
+    {
+        printf("%c", s[i]);
+    }
+    printf("\n");
+}

2023_CS50X/arrays/Source/string1.c

@@ -0,0 +1,16 @@
+// Prints string char by char, using strlen, remembering string's length
+
+#include <cs50.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(void)
+{
+    string s = get_string("Input:  ");
+    printf("Output: ");
+    for (int i = 0, n = strlen(s); i < n; i++)
+    {
+        printf("%c", s[i]);
+    }
+    printf("\n");
+}

2023_CS50X/arrays/Source/uppercase0.c

@@ -0,0 +1,23 @@
+// Uppercases a string
+
+#include <cs50.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(void)
+{
+    string s = get_string("Before: ");
+    printf("After:  ");
+    for (int i = 0, n = strlen(s); i < n; i++)
+    {
+        if (s[i] >= 'a' && s[i] <= 'z')
+        {
+            printf("%c", s[i] - 32);
+        }
+        else
+        {
+            printf("%c", s[i]);
+        }
+    }
+    printf("\n");
+}

2023_CS50X/arrays/Source/uppercase1.c

@@ -0,0 +1,24 @@
+// Uppercases string using ctype library (and an unnecessary condition)
+
+#include <cs50.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(void)
+{
+    string s = get_string("Before: ");
+    printf("After:  ");
+    for (int i = 0, n = strlen(s); i < n; i++)
+    {
+        if (islower(s[i]))
+        {
+            printf("%c", toupper(s[i]));
+        }
+        else
+        {
+            printf("%c", s[i]);
+        }
+    }
+    printf("\n");
+}

2023_CS50X/arrays/Source/uppercase2.c

@@ -0,0 +1,17 @@
+// Uppercases string using ctype library
+
+#include <cs50.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(void)
+{
+    string s = get_string("Before: ");
+    printf("After:  ");
+    for (int i = 0, n = strlen(s); i < n; i++)
+    {
+        printf("%c", toupper(s[i]));
+    }
+    printf("\n");
+}