#include <stdio.h> int main() { // Data types int num = 10; float pi = 3.14; char letter = 'A'; double largeNum = 1234567890.1234567890; // Control flow statements if (num > 0) { printf("Positive number\n"); } else { printf("Negative number\n"); } for (int i = 0; i < num; i++) { printf("%d ", i); } printf("\n"); while (num > 0) { printf("%d ", num); num--; } printf("\n"); // Functions int add(int a, int b) { return a + b; } int sum = add(5, 3); printf("Sum: %d\n", sum); // Pointers int* ptr = &num; printf("Value: %d\n", *ptr); // Arrays int arr[] = {1, 2, 3, 4, 5}; for (int i = 0; i < sizeof(arr) / sizeof(arr[0]); i++) { printf("%d ", arr[i]); } printf("\n"); // Structures struct Point { int x; int y; }; struct Point p; p.x = 10; p.y = 20; printf("Point: (%d, %d)\n", p.x, p.y); // File handling FILE* file = fopen("example.txt", "w"); if (file != NULL) { fputs("Hello, World!", file); fclose(file); } return 0; }