Programming Languages Labs - Leyli

src/hello.c

@@ -2,8 +2,8 @@
 #include <stdio.h>
 
 int main(int argc, char *argv[]) {
-  // This is your first C program my friend
-  printf("Hello, RTU World from C Lab in 2025!\n");
+  // My first C program!
+  printf("Hello, RTU World from C Lab in September 2025!\n");
   printf("You passed %d argument(s).\n", argc - 1);
   for (int i = 1; i < argc; ++i) {
     printf("  arg[%d] = %s\n", i, argv[i]);

src/lab2_1.c

@@ -12,8 +12,11 @@
 */
 
 int sum_to_n(int n) {
-    // TODO: implement sum with a for loop
-    return 0; // placeholder
+    int sum=0;
+    for (int i=1; i<=n; i++) {
+        sum +=i;
+    }
+    return sum; // placeholder
 }
 
 int main(void) {
@@ -22,7 +25,11 @@ int main(void) {
     printf("Enter a positive integer n: ");
     scanf("%d", &n);
 
-    // TODO: validate input, call function, and print result
+    if (n<1) {
+        printf("error\n");
+    } else {
+        printf("The sum is: %d\n", sum_to_n(n));
+    }
 
     return 0;
 }

src/lab2_2.c

@@ -12,8 +12,11 @@
 */
 
 long long factorial(int n) {
-    // TODO: compute factorial iteratively
-    return 1; // placeholder
+    long long res = 1;
+    for (int i=1; i<=n; i++) {
+        res *= i;
+    }
+    return res; // placeholder
 }
 
 int main(void) {
@@ -22,7 +25,11 @@ int main(void) {
     printf("Enter a non-negative integer n: ");
     scanf("%d", &n);
 
-    // TODO: validate input, call function, print result
+    if (n<0) {
+        printf("Error\n");
+    } else {
+        printf("The result is: %d\n", factorial(n));
+    }
 
     return 0;
 }

src/lab2_3.c

@@ -12,8 +12,13 @@
 */
 
 int is_prime(int n) {
-    // TODO: check if n is prime using loop up to sqrt(n)
-    return 0; // placeholder
+    if (n<2) return 0;
+    for (int i=2; i*i <= n; i++) {
+        if (n % i == 0) {
+            return 0;
+        }
+    }
+    return 1; // placeholder
 }
 
 int main(void) {
@@ -22,7 +27,17 @@ int main(void) {
     printf("Enter an integer n (>= 2): ");
     scanf("%d", &n);
 
-    // TODO: validate input and print all primes up to n
+    if (n<=2) {
+        printf("Error\n");
+    } else {
+        printf("Prime numbers up to %d:\n", n);
+        for (int i=2; i<=n; i++) {
+            if (is_prime(i)) {
+                printf("%d ", i);
+            }
+        }
+    }
+    printf("\n");
 
     return 0;
 }

src/lab3_task1.c

@@ -23,7 +23,10 @@
 
 #include <stdio.h>
 #include <limits.h>
+<<<<<<< HEAD
+=======
 
+>>>>>>> upstream/main
 // Function prototypes
 int array_min(int arr[], int size);
 int array_max(int arr[], int size);
@@ -44,8 +47,12 @@ int main(void) {
 
 // Implement functions below
 int array_min(int arr[], int size) {
+<<<<<<< HEAD
+    int my_min = INT_MAX;
+=======
     // TODO: return smallest element
     int my_min = INT_MAX; //set to max infinity
+>>>>>>> upstream/main
     for (int i=0;i<size;i++) {
         if (my_min > arr[i]) {
             my_min = arr[i];
@@ -55,16 +62,25 @@ int array_min(int arr[], int size) {
 }
 
 int array_max(int arr[], int size) {
-    // TODO: return largest element
-    return 0; // placeholder
+    int my_max = INT_MIN;
+    for (int i=0;i<size;i++) {
+        if (arr[i] >my_max) {
+            my_max = arr[i];
+        }
+    }
+    return my_max; // placeholder
 }
 
 int array_sum(int arr[], int size) {
-    // TODO: return sum of elements
-    return 0; // placeholder
+    int sum = 0;
+    for (int i=0; i<size; i++) {
+        sum += arr[i];
+    }
+    return sum; // placeholder
 }
 
 float array_avg(int arr[], int size) {
-    // TODO: return average as float
-    return 0.0f; // placeholder
+    if (size == 0) return 0.0f; 
+    int sum = array_sum(arr, size);
+    return (float) sum/size;
 }

src/lab3_task2.c

@@ -38,9 +38,11 @@ int main(void) {
 
 // Implement functions below
 void swap(int *x, int *y) {
-    // TODO: swap values using a temporary variable
+    int t = *x;
+    *x = *y;
+    *y = t;
 }
 
 void modify_value(int *x) {
-    // TODO: multiply value by 2
+    *x = *x * 2;
 }

src/lab3_task3.c

@@ -41,10 +41,18 @@ int main(void) {
 
 // Implement functions below
 int my_strlen(const char *str) {
-    // TODO: count characters until '\0'
-    return 0; // placeholder
+    int len = 0;
+    while (str[len] != '\0') {
+        len++;
+    }
+    return len; // placeholder
 }
 
 void my_strcpy(char *dest, const char *src) {
-    // TODO: copy characters until '\0'
+    int i = 0;
+    while (src[i] != '\0') {
+        dest[i] = src[i];
+        i++;
+    }
+    dest[i] = '\0';
 }

src/meow

@@ -0,0 +1,3 @@
+Meow meow 1
+Meow meow 2
+Meow meow 3

src/student.txt

@@ -0,0 +1,3 @@
+Alice
+21
+3.75

src/students.txt

@@ -0,0 +1,2 @@
+leyli 241 -nan
+db 121 5.80

src/week4_1_dynamic_array.c

@@ -1,7 +1,7 @@
 /*
  * week4_1_dynamic_array.c
- * Author: [Your Name]
- * Student ID: [Your ID]
+ * Author: Leyli Iskandarli
+ * Student ID: 241ADB073
  * Description:
  *   Demonstrates creation and usage of a dynamic array using malloc.
  *   Students should allocate memory for an integer array, fill it with data,
@@ -14,6 +14,8 @@
 int main(void) {
     int n;
     int *arr = NULL;
+    int sum = 0;
+    double avg;
 
     printf("Enter number of elements: ");
     if (scanf("%d", &n) != 1 || n <= 0) {
@@ -23,16 +25,29 @@ int main(void) {
 
     // TODO: Allocate memory for n integers using malloc
     // Example: arr = malloc(n * sizeof(int));
+    arr = (int *)malloc(n * sizeof(int));
 
     // TODO: Check allocation success
+    if (arr == NULL) {
+        printf("Error");
+        return 1;
+    }
 
     // TODO: Read n integers from user input and store in array
-
-    // TODO: Compute sum and average
+    //Compute sum and average
+    printf("Enter %d integers: \n", n);
+    for (int i=0; i<n; i++) {
+        scanf("%d", &arr[i]);
+        sum += arr[i];
+    }
+    avg = (double)sum/n;
 
     // TODO: Print the results
+    printf("Sum = %d\n", sum);
+    printf("Average = %.2f\n", avg);
 
     // TODO: Free allocated memory
+    free(arr);
 
     return 0;
 }

src/week4_2_struct_student.c

@@ -1,7 +1,7 @@
 /*
  * week4_2_struct_student.c
- * Author: [Your Name]
- * Student ID: [Your ID]
+ * Author: Leyli Iskandarli
+ * Student ID: 241ADB073
  * Description:
  *   Demonstrates defining and using a struct in C.
  *   Students should define a 'Student' struct with fields like name, id, and grade.
@@ -13,18 +13,35 @@
 
 // TODO: Define struct Student with fields: name (char[]), id (int), grade (float)
 // Example:
-// struct Student {
-//     char name[50];
-//     int id;
-//     float grade;
-// };
+struct Student {
+    char name[50];
+    int id;
+    float grade;
+};
 
 int main(void) {
     // TODO: Declare one or more Student variables
+    struct Student student1, student2;
 
     // TODO: Assign values (either manually or via scanf)
+    strcpy(student1.name, "Leyli");
+    student1.id = 1;
+    student1.grade = 8.9;
+
+    strcpy(student2.name, "Meow");
+    student2.id = 2;
+    student2.grade = 8.5;
 
     // TODO: Print struct contents using printf
+    printf("Student 1:\n");
+    printf("  Name: %s\n", student1.name);
+    printf("  ID: %d\n", student1.id);
+    printf("  Grade: %.2f\n", student1.grade);
+
+    printf("\nStudent 2:\n");
+    printf("  Name: %s\n", student2.name);
+    printf("  ID: %d\n", student2.id);
+    printf("  Grade: %.2f\n", student2.grade);
 
     return 0;
 }

src/week4_3_struct_database.c

@@ -1,7 +1,7 @@
 /*
  * week4_3_struct_database.c
- * Author: [Your Name]
- * Student ID: [Your ID]
+ * Author: Leyli Iskandarli
+ * Student ID: 241ADB073
  * Description:
  *   Simple in-memory "database" using an array of structs.
  *   Students will use malloc to allocate space for multiple Student records,
@@ -13,6 +13,11 @@
 #include <string.h>
 
 // TODO: Define struct Student with fields name, id, grade
+struct Student {
+    char name[50];
+    int id;
+    float grade;
+};
 
 int main(void) {
     int n;
@@ -25,14 +30,43 @@ int main(void) {
     }
 
     // TODO: Allocate memory for n Student structs using malloc
+    students = (struct Student *)malloc(n * sizeof(struct Student));
+    if (students == NULL) {
+        printf("Error");
+        return 1;
+    }
 
     // TODO: Read student data in a loop
+    for (int i = 0; i < n; i++) {
+        printf("\nEnter data for student %d:\n", i + 1);
+        printf("  Name: ");
+        scanf(" %[^\n]", students[i].name);  
+
+        printf("  ID: ");
+        scanf("%d", &students[i].id);
+
+        printf("  Grade: ");
+        scanf("%f", &students[i].grade);
+    }
 
     // TODO: Display all student records in formatted output
+    printf("\n Student Records: \n");
+    for (int i = 0; i < n; i++) {
+        printf("Student %d:\n", i + 1);
+        printf("Name: %s\n", students[i].name);
+        printf("ID: %d\n", students[i].id);
+        printf("Grade: %.2f\n\n", students[i].grade);
+    }
 
     // Optional: Compute average grade or find top student
+    float sum = 0.0;
+    for (int i = 0; i < n; i++) {
+        sum += students[i].grade;
+    }
+    printf("Average grade: %.2f\n", sum / n);
 
     // TODO: Free allocated memory
+    free(students);
 
     return 0;
 }