Code:

#include <stdio.h>
#include <string.h>

// Define the Vehicle structure
struct Vehicle {
    char registrationNumber[16];
    char ownerName[51];
    char vehicleType[21];
    float mileage;
    float fuelCapacity;
    float currentFuel;
};

// Function to calculate max distance
float calculateMaxDistance(struct Vehicle v) {
    return v.mileage * v.currentFuel;
}

// Function to display vehicle details
void displayVehicle(struct Vehicle v) {
    printf("Registration Number:\t%s\n", v.registrationNumber);
    printf("Owner Name:\t\t%s\n", v.ownerName);
    printf("Vehicle Type:\t\t%s\n", v.vehicleType);
    printf("Mileage (km/l):\t\t%.2f\n", v.mileage);
    printf("Fuel Capacity (l):\t%.2f\n", v.fuelCapacity);
    printf("Current Fuel (l):\t%.2f\n", v.currentFuel);
    printf("Maximum Distance:\t%.2f km\n", calculateMaxDistance(v));
    printf("--------------------------------------\n");
}

int main() {
    // Initialize data for 5 vehicles
    struct Vehicle fleet[5] = {
        {"AP09AB1234", "Ramesh Kumar", "Car", 18.5, 45, 30},
        {"TS10CD5678", "Sneha Reddy", "Truck", 6.0, 120, 80},
        {"AP29XY7890", "Aamir Hussain", "Van", 12.0, 60, 40},
        {"TS07MN3456", "Divya Sharma", "Car", 16.0, 50, 25},
        {"AP31PQ1122", "Arjun Patel", "Truck", 5.5, 130, 100}
    };

    printf("Fleet Vehicle Details:\n");
    printf("======================================\n");

    float maxDistance = 0;
    int maxIndex = 0;

    // Display all vehicle details and calculate max distance
    for (int i = 0; i < 5; i++) {
        displayVehicle(fleet[i]);

        float distance = calculateMaxDistance(fleet[i]);
        if (distance > maxDistance) {
            maxDistance = distance;
            maxIndex = i;
        }
    }

    // Print the vehicle that can travel the farthest
    printf("\nVehicle that can travel the farthest:\n");
    printf("======================================\n");
    displayVehicle(fleet[maxIndex]);

    return 0;
}