feat(assign1): add employee.c

assign1/c-programs/employee.c

@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <string.h>
+
+int main() {
+  // Character array to store name
+  // In C, strings are arrays of characters ending with '\0'
+  char name[50];
+  int employee_id;
+  float hours_worked;
+
+  printf("OwlTech Employee Registration\n");
+  printf("=============================\n");
+
+  printf("Enter your name: ");
+  // fgets reads a line including spaces
+  // stdin means "standard input" (keyboard)
+  fgets(name, sizeof(name), stdin);
+
+  // Remove newline that fgets includes
+  name[strcspn(name, "\n")] = '\0';
+
+  printf("Enter your employee ID: ");
+  // & means "address of" - scanf needs to know where to store the value
+  scanf("%d", &employee_id);
+  printf("Hours worked this week: ");
+  scanf("%f", &hours_worked);
+
+  printf("\nEmployee Summary:\n");
+  printf("Name: %s\n", name); // %s for string
+  printf("ID: %d\n", employee_id); // %d for integer
+  printf("Hours: %.2f\n", hours_worked); // %.2f for float with 2 decimals
+
+  return 0;
+}

assign1/default.nix

@@ -1,12 +1,21 @@
-{
+let
-  assign1-hello = { stdenv }:
+  basic-c = name: { stdenv }:
     stdenv.mkDerivation {
-      name = "hello";
+      inherit name;
       src = ./.;
-      buildPhase = "gcc c-programs/hello.c -o hello";
+      buildPhase = ''
+        runHook preBuild
+        gcc c-programs/${name}.c -o ${name}
+        runHook postBuild
+      '';
       installPhase = ''
+        runHook preInstall
         mkdir -p $out/bin
-        install hello $out/bin/hello
+        install ${name} $out/bin/
+        runHook postInstall
       '';
     };
+in {
+  assign1-hello = basic-c "hello";
+  assign1-employee = basic-c "employee";
 }