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#include <stdio.h>
#include <stdlib.h>

// Forward declarations
void fibo(void);
void military_time(void);

int main() {
    char choice;
    int runProgram = 1;

    do {
        // Clear screen (optional, depends on your system). 
        // On Windows you can use "cls", on Linux/macOS use "clear"
        // system("cls");  
        // or system("clear"); 

        printf("=====================================\n");
        printf("        M A I N   M E N U\n");
        printf("=====================================\n");
        printf("   A. FIBONACCI SERIES\n");
        printf("   B. MILITARY TIME\n");
        printf("   C. EXIT\n");
        printf("=====================================\n");
        printf("CHOOSE LETTER TO EXECUTE: ");
        scanf(" %c", &choice);

        switch(choice) {
            case 'A':
            case 'a':
                fibo();
                break;

            case 'B':
            case 'b':
                military_time();
                break;

            case 'C':
            case 'c':
                printf("\nExiting the program...\n");
                runProgram = 0;
                break;

            default:
                printf("\nInvalid choice. Please choose A, B, or C.\n");
                break;
        }

        // If user did not choose to exit, we can ask if they want to go again
        if(runProgram) {
            char again;
            printf("\nDo you want to go back to the main menu? (Y/N): ");
            scanf(" %c", &again);
            if(again == 'N' || again == 'n') {
                runProgram = 0; 
            }
        }

    } while(runProgram);

    return 0;
}

// -------------------------------------------------
// FIBONACCI / RABBITS FUNCTION
// -------------------------------------------------
// This function calculates how many rabbits (pairs) 
// there are after 12 months, stores them in an array
// and displays them, then prints the final total.
void fibo(void) {
    // We’ll store 12 months of data in an array:
    int RABBIT[12];
    // First two months in classical Fibonacci: 1, 1
    RABBIT[0] = 1;
    RABBIT[1] = 1;

    // Generate Fibonacci for months 3 to 12
    for(int i = 2; i < 12; i++) {
        RABBIT[i] = RABBIT[i-1] + RABBIT[i-2];
    }

    printf("\nFIBONACCI SERIES FOR 12 MONTHS (Rabbits per month):\n");
    for(int i = 0; i < 12; i++) {
        printf("Month %2d: %d\n", i+1, RABBIT[i]);
    }

    // The total number of rabbits at the 12th month
    printf("\nAfter 12 months, total rabbits = %d\n", RABBIT[11]);
    // If you wanted to sum them all, you'd do:
    // int sum = 0;
    // for(int i = 0; i < 12; i++) sum += RABBIT[i];
    // printf("Sum of all months = %d\n", sum);

    printf("\n");
}

// -------------------------------------------------
// MILITARY TIME FUNCTION
// -------------------------------------------------
// Converts a time given in 24-hour notation (0000 to 2400)
// into 12-hour notation or reports INVALID if out of range.
void military_time(void) {
    int input;
    int hour, minute;

    printf("\nEnter time in military format (0 to 2400): ");
    scanf("%d", &input);

    // Quick check for valid range
    if(input < 0 || input > 2400) {
        printf("Output : INVALID\n\n");
        return;
    }

    // Separate hours and minutes
    hour = input / 100;   // e.g. 1300 -> hour = 13
    minute = input % 100; // e.g. 1300 -> minute = 0

    // Check if minutes are valid (0–59). If not, invalid.
    if(minute < 0 || minute > 59) {
        printf("Output : INVALID TIME\n\n");
        return;
    }

    // Special case for 2400 -> treat as 00:00
    if(hour == 24 && minute == 0) {
        // 24:00 is effectively 12:00 AM
        printf("Output : 12:00 AM\n\n");
        return;
    }
    // If hour is 24 with non-zero minutes, it's invalid.
    if(hour == 24 && minute != 0) {
        printf("Output : INVALID TIME\n\n");
        return;
    }

    // Now convert to 12-hour format
    // We’ll display something like "1:00 PM"
    if(hour == 0) {
        // Midnight hour
        printf("Output : 12:%02d AM\n\n", minute);
    } else if(hour < 12) {
        // From 1:00 AM to 11:59 AM
        printf("Output : %d:%02d AM\n\n", hour, minute);
    } else if(hour == 12) {
        // 12:xx PM
        printf("Output : 12:%02d PM\n\n", minute);
    } else {
        // From 13:00 to 23:59 => subtract 12 for PM
        printf("Output : %d:%02d PM\n\n", hour - 12, minute);
    }
}