feat(assign1): add logwriter.c

assign1/c-programs/logwriter.c

@@ -0,0 +1,39 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+
+int main() {
+  FILE *logfile; // Pointer to file structure
+  char message[100];
+  time_t current_time;
+
+  // Open file for appending ("a" mode)
+  // "w" would overwrite, "r" would read
+  logfile = fopen("owltech.log", "a");
+
+  // Always check if file opened successfully
+  if (logfile == NULL) {
+    printf("Error: Could not open log file\n");
+    return 1; // Return non-zero to indicate error
+  }
+
+  printf("Enter log message: ");
+  fgets(message, sizeof(message), stdin);
+
+  // Get current time
+  time(&current_time);
+
+  // Write to file with timestamp
+  // fprintf works like printf but writes to a file
+  fprintf(logfile, "[%s] %s", ctime(&current_time), message);
+
+  // Always close files when done
+  fclose(logfile);
+  printf("Log entry saved successfully!\n");
+
+  // Display the log file contents
+  printf("\n--- Current Log Contents ---\n");
+  system("cat owltech.log");
+
+  return 0;
+}

assign1/default.nix

@@ -18,4 +18,5 @@ let
 in {
   assign1-hello = basic-c "hello";
   assign1-employee = basic-c "employee";
+  assign1-logwriter = basic-c "logwriter";
 }