commit 0cc1d57c6ef5f3d98a963bd1192e29304f23c57e
parent 0228ec68d33ae3c181955fc381e440f304c5bb41
Author: Amit Dutta <amitdutta4255@gmail.com>
Date: Mon, 13 Oct 2025 11:47:20 +0530
sudipto's code for his _first
Diffstat:
1 file changed, 54 insertions(+), 0 deletions(-)
diff --git a/challange/sudiptoown01.c b/challange/sudiptoown01.c
@@ -0,0 +1,53 @@
+/*
+ * A smart home security controller monitors the state of several sensors to decide what action to take.
+ * Each second, the system reads data from sensors that are either an active or inactive. Based on the current
+ * state of all sensors, the controller must perform exactly one action, such as activating a warning, checking
+ * a specific zone, or declaring an intrusion. Write a C program that reads the sensor status as input and
+ * prints the corresponding system action.
+ * Hints:
+ * 1. The most determinative action wins for every possible combination of sensor states.
+ * 2. You are not allowed to use any conditional statements (if, else if, else, or the ternary operator?).
+ * 3. You are not allowed to use logical operators.
+ * 4. You must use a single switch statement to control the program's behavior.
+ * 5. The program should handle all possible combinations of the sensors' active/inactive states and print the appropriate response each time.
+ * 6. All sensors are inactive, the system should remain idle.
+ * 7. If some sensors are active, the system should issue warnings or alerts based on the situation.
+ * 8. If all sensors are active, the system should declare a confirmed intrusion.
+ * Solution:
+ * We can solve this problem simply by assigning each case its own distinct integer.
+ * There are 2 possibilities for a sensor and therefore there are 2^4 = 16 cases.
+ * Using arrays we can assign each case its own index value and print it as per the encoded binary integer.
+ */
+#include <stdio.h>
+
+int casekey(int door, int window, int motion, int glass) {
+ int key = (door << 3) | (window << 2) | (motion << 1) | glass;
+ return key;
+}
+
+int main() {
+ int door, window, motion, glass, key;
+ char choice;
+
+ static const char *action[16] = {
+ "IDLE", "CHECK WINDOW", "WARN MOTION", "WARN MOTION WINDOW",
+ "CHECK DOOR", "WARN DOOR WINDOW", "INTRUSION SUSPECTED", "INTRUSION CONFIRMED",
+ "GLASS ONLY", "DOOR GLASS", "MOTION GLASS", "MOTION WINDOW GLASS",
+ "DOOR WINDOW", "DOOR WINDOW GLASS", "DOOR MOTION GLASS", "ALL SENSORS"
+ };
+
+ do {
+ printf("Sensors: Door, Window, Motion, Glass\n");
+ printf("Enter the state of each sensor in binary (0 or 1): ");
+ scanf("%d %d %d %d", &door, &window, &motion, &glass);
+
+ key = casekey(door, window, motion, glass);
+ printf("Action: %s\n", action[key]);
+
+ printf("Want to continue? (y/n): ");
+ scanf(" %c", &choice);
+ printf("\n");
+ } while (choice == 'y' || choice == 'Y');
+
+ return 0;
+}+
\ No newline at end of file
