Example: Multi-Criteria Car Selector in C

// Multi-Criteria Car Selector
#include <stdio.h>

int main() {
    // Step 1: Declare variables for various car criteria
    int budget;
    int fuel_choice;    // 1: Petrol, 2: Diesel, 3: Electric
    int seating_choice; // 1: 2-3 seats, 2: 4-5 seats, 3: 6-7 seats

    // Step 2: Get user inputs
    printf("Welcome to the Multi-Criteria Car Selector!\n");
    printf("Enter your maximum budget (in USD): ");
    scanf("%d", &budget);

    printf("\nChoose preferred fuel type:\n");
    printf("  1. Petrol\n");
    printf("  2. Diesel\n");
    printf("  3. Electric\n");
    printf("Enter your choice (1-3): ");
    scanf("%d", &fuel_choice);

    printf("\nChoose preferred seating capacity:\n");
    printf("  1. 2-3 seats (e.g., Sports car, Mini compact)\n");
    printf("  2. 4-5 seats (e.g., Sedan, Hatchback, Small SUV)\n");
    printf("  3. 6-7 seats (e.g., MPV, Large SUV)\n");
    printf("Enter your choice (1-3): ");
    scanf("%d", &seating_choice);

    // Step 3: Apply complex conditions to suggest a car
    printf("\nAnalyzing your preferences...\n");

    if (budget < 15000) {
        if (seating_choice == 2 && fuel_choice == 1) {
            printf("Recommendation: Economical Hatchback/Sedan (e.g., Renault Kwid, Datsun Go).\n");
        } else if (seating_choice == 1) {
            printf("Recommendation: Used Mini Compact Car (e.g., Smart Fortwo).\n");
        } else {
            printf("Recommendation: Limited options in this budget for specific fuel/seating. Consider used.\n");
        }
    } else if (budget >= 15000 && budget < 30000) {
        if (seating_choice == 2) {
            if (fuel_choice == 1) {
                printf("Recommendation: Mid-range Petrol Sedan/Hatchback (e.g., Hyundai i20, Honda City).\n");
            } else if (fuel_choice == 2) {
                printf("Recommendation: Mid-range Diesel Sedan/Hatchback (e.g., Hyundai Verna Diesel).\n");
            } else if (fuel_choice == 3) {
                printf("Recommendation: Entry-level Electric Vehicle (e.g., Tata Nexon EV, MG Comet EV).\n");
            } else {
                printf("Recommendation: Explore petrol/diesel options in this segment.\n");
            }
        } else if (seating_choice == 3) {
            printf("Recommendation: Entry-level MPV/SUV (e.g., Maruti Ertiga, Kia Carens - petrol/diesel).\n");
        } else {
            printf("Recommendation: Consider mid-range options with 4-5 seats as main choice.\n");
        }
    } else if (budget >= 30000 && budget < 50000) {
        if (seating_choice == 2) {
            if (fuel_choice == 1 || fuel_choice == 2) {
                printf("Recommendation: Premium Mid-size Sedan/SUV (e.g., Skoda Octavia, Hyundai Creta).\n");
            } else if (fuel_choice == 3) {
                printf("Recommendation: Mid-range Electric Car (e.g., MG ZS EV, Mahindra XUV400).\n");
            }
        } else if (seating_choice == 3) {
            if (fuel_choice == 1 || fuel_choice == 2) {
                printf("Recommendation: Large SUV/MPV (e.g., Toyota Innova, Mahindra XUV700).\n");
            } else if (fuel_choice == 3) {
                printf("Recommendation: Larger Electric SUV (e.g., BYD Atto 3).\n");
            }
        } else {
            printf("Recommendation: Wide range of premium options available.\n");
        }
    } else { // budget >= 50000
        printf("Recommendation: Luxury Segment. Options include premium sedans, high-end SUVs, or performance EVs.\n");
        printf("  Consider brands like Mercedes-Benz, BMW, Audi, Tesla, Volvo.\n");
    }

    return 0;
}