Draw state diagram for this code ```c#include #include #include int main(void){ int state = 1; char input; while (state != 4) { switch (state) { case 1: printf("Enter credit card: "); scanf("%c", &input); if (input == '1') state = 2; else state = 3; break; case 2: printf("If credit card is valid, record credit card number and time.\n"); state = 4; break; case 3: printf("If credit card is invalid, display error message.\n"); state = 1; break; } } printf("Exit parking garage.\n"); printf("Calculate charge based on credit card number and time.\n"); return 0;}```### Explanation of the CodeThis C program is designed to simulate a simple credit card validation process typically used in a parking garage setting. Here's a detailed breakdown of its components and workflow:1. **Header Files**: - `#include `: Includes the standard input-output library for functions like `printf` and `scanf`. - `#include ` and `#include `: These are for general utilities and the `bool` type, although `bool` is not used here.2. **Main Function**: - `int main(void)`: The entry point of the program. - `int state = 1;` and `char input;`: Initializes the state variable to control the flow of the program and a character variable for user input.3. **State Machine**: - Uses a `while` loop with a condition `state != 4` to keep the system running until the state changes to 4. - `switch` statement handles different states: - **Case 1**: Prompts the user to "Enter credit card". Depending on whether input is '1', it proceeds to state 2 or state 3. - **Case 2**: Assumes the credit card is valid, records the credit card number and time, then moves to state 4. - **Case 3**: Assumes the credit card is invalid, shows an error message,

#include #include #include int main(void) { int state = 1; char input; while (state != 4) { switch (state) { } case 1: printf("Enter credit card: "); scanf("%c", &input); if (input == = '1') state = 2; else state = 3; break; case 2: printf("If credit card is valid, record credit card number and time.\n"); state = 4; break; case 3: printf("If credit card is invalid, display error message.\n"); state = 1; break; printf("Exit parking garage.\n"); printf("Calculate charge based on credit card number and time.\n"); return 0;

#include #include #include int main(void) { int state = 1; char input; while (state != 4) { switch (state) { } case 1: printf("Enter credit card: "); scanf("%c", &input); if (input == = '1') state = 2; else state = 3; break; case 2: printf("If credit card is valid, record credit card number and time.\n"); state = 4; break; case 3: printf("If credit card is invalid, display error message.\n"); state = 1; break; printf("Exit parking garage.\n"); printf("Calculate charge based on credit card number and time.\n"); return 0;

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

100%

Draw state diagram for this code

```c
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

int main(void)
{
int state = 1;
char input;

while (state != 4)
{
switch (state)
{
case 1:
printf("Enter credit card: ");
scanf("%c", &input);
if (input == '1')
state = 2;
else
state = 3;
break;
case 2:
printf("If credit card is valid, record credit card number and time.\n");
state = 4;
break;
case 3:
printf("If credit card is invalid, display error message.\n");
state = 1;
break;
}
}

printf("Exit parking garage.\n");
printf("Calculate charge based on credit card number and time.\n");

return 0;
}
```

### Explanation of the Code

This C program is designed to simulate a simple credit card validation process typically used in a parking garage setting. Here's a detailed breakdown of its components and workflow:

1. **Header Files**:
- `#include <stdio.h>`: Includes the standard input-output library for functions like `printf` and `scanf`.
- `#include <stdlib.h>` and `#include <stdbool.h>`: These are for general utilities and the `bool` type, although `bool` is not used here.

2. **Main Function**:
- `int main(void)`: The entry point of the program.
- `int state = 1;` and `char input;`: Initializes the state variable to control the flow of the program and a character variable for user input.

3. **State Machine**:
- Uses a `while` loop with a condition `state != 4` to keep the system running until the state changes to 4.
- `switch` statement handles different states:
- **Case 1**: Prompts the user to "Enter credit card". Depending on whether input is '1', it proceeds to state 2 or state 3.
- **Case 2**: Assumes the credit card is valid, records the credit card number and time, then moves to state 4.
- **Case 3**: Assumes the credit card is invalid, shows an error message,

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