#include <stdio.h> #include <stdlib.h> #include <math.h> #include <string.h> #include <stdbool.h> #include <limits.h> #include <ctype.h> #include <time.h> #define PI 3.14159 #define SQUARE(x) ((x) * (x)) #define CUBE(x) ((x) * (x) * (x)) typedef struct { int value; } Example; void increment(Example *e) { e->value += 1; } void print_example(const Example *e) { printf("Value: %d\n", e->value); } int fibonacci(int n, int *sequence) { if (n <= 0) return 0; sequence[0] = 0; if (n > 1) sequence[1] = 1; for (int i = 2; i < n; i++) { sequence[i] = sequence[i - 1] + sequence[i - 2]; } return 1; } void reverse_string(char *str) { int len = strlen(str); for (int i = 0; i < len / 2; i++) { char temp = str[i]; str[i] = str[len - 1 - i]; str[len - 1 - i] = temp; } } void print_array(int *arr, int size) { for (int i = 0; i < size; i++) { printf("%d ", arr[i]); } printf("\n"); } int main() { printf("C typing practice!\n"); printf("Operators: + - * / %% ++ --\n"); printf("Comparison: == != < > <= >=\n"); printf("Logical: && || !\n"); printf("Bitwise: & | ^ ~ << >>\n"); printf("Assignment: = += -= *= /= %%= &= |= ^= <<= >>=\n"); Example ex = {10}; print_example(&ex); increment(&ex); print_example(&ex); int sequence[20]; if (fibonacci(20, sequence)) { printf("Fibonacci: "); print_array(sequence, 20); } FILE *file = fopen("sample.txt", "w"); if (file) { fprintf(file, "Hello, world!\n"); fclose(file); } char *words[] = {"apple", "banana", "cherry", "date", "elderberry"}; for (int i = 0; i < 5; i++) { printf("%s\n", words[i]); } int numbers[20]; for (int i = 0; i < 20; i++) { numbers[i] = CUBE(i); printf("%d:%d ", i, numbers[i]); } printf("\n"); char str[] = "abcdef"; printf("Original string: %s\n", str); reverse_string(str); printf("Reversed string: %s\n", str); srand(time(NULL)); printf("Random number: %d\n", rand() % 100); int (*func_ptr)(int) = &abs; printf("Absolute of -10: %d\n", func_ptr(-10)); bool flag = false; printf("Boolean flag: %s\n", flag ? "true" : "false"); return 0;