c - 结构和字符串

Question

基本上，我无法理解这个问题。

所以我正在尝试刺激一些电梯。

• 最初，所有电梯都在 1 楼，里面有 0 名乘客和 0 使用(即，还没有人使用完它们)。

• 给定一系列楼层号，电梯将前往
  一一对应楼层。

• 如果电梯从较低楼层到较高楼层 m, m
  乘客将尝试进入电梯。然而，一旦
  电梯内乘客人数达到15人，即
  电梯的容量，没有额外的乘客将无法
  进入电梯。

• 如果一部载有 p 位乘客的电梯从较高楼层到较低楼层n、n(或 p，以较小者为准)楼层乘客将离开
  电梯。实际退出电梯的乘客人数
  应计入已完成的乘客人数使用电梯。

此后，我尝试打印出相应的楼层、乘客数量和使用情况。

Enter number of elevators: 1 
Enter sequence for elevator 1: 24653    
Elevator 1: 
Floor: 3 
Number of passengers: 4 
Usage: 8 
Most used elevator: 1

Enter number of elevators: 2
Enter sequence for elevator 1: 24653
Enter sequence for elevator 2: 798635
Elevator 1:
Floor: 3
Number of passengers: 4
Usage: 8
Elevator 2:
Floor: 5
Number of passengers: 5
Usage: 15
Most used elevator: 2

我需要有关“runElevators”和“goToFloor”功能的帮助，因为我不确定它们需要什么。我认为我在“runElevators”中做错了什么，但我不确定到底是什么。

我知道字符“2”并不意味着整数“2”，但我似乎无法解决它。

任何帮助将不胜感激。谢谢!

#include <stdio.h>
#include <string.h>
#define CAPACITY 15
#define MAX_LEN 21
#define MAX_ELEVATORS 5

typedef struct { 
    int floor, passenger, usage;
} elevator_t;

void setupElevators(elevator_t [], int);
void readSequences(char [][MAX_LEN], int);
void runElevators(elevator_t [], char [][MAX_LEN], int);
void goToFloor(elevator_t *, int);
void printElevators(elevator_t [], int size);
int mostUsedElevator(elevator_t [], int);

// This function is given. You are NOT to modify it.
int main(void){
    int size;
    elevator_t elevators[MAX_ELEVATORS];
    char sequences[MAX_ELEVATORS][MAX_LEN];

    printf("Enter number of elevators: ");
    scanf("%d", &size);

    setupElevators(elevators, size);
    readSequences(sequences, size);

    runElevators(elevators, sequences, size);

    printElevators(elevators, size);
    printf("Most used elevator: %d\n", mostUsedElevator(elevators, size));

    return 0;
}

void setupElevators(elevator_t elevators[], int size){

    int i;

    for(i = 0; i < size; i++)
    {
        elevators[i].floor = 1;
        elevators[i].passenger = 0;
        elevators[i].usage = 0;
    }
}   

// Read in the sequences of floors the elevators go to.
// This function is given. You are NOT to modify it.
void readSequences(char sequences[][MAX_LEN], int size){
    int i;

    for (i = 0; i<size; i++){
        printf("Enter sequence for elevator %d: ", i+1);
        scanf("%s", sequences[i]);
    }
}

void runElevators(elevator_t elevators[], char sequences[][MAX_LEN], int size){


    int i, c;

    for(i = 0; i < size; i++)
        for(c = 0; c < strlen(sequences[i]); c++)
        {   
            elevators[i].floor = sequences[i][strlen(sequences[i]) - 1];

            if((elevators[i].passenger < 15) && (sequences[i][c+1] > sequences[i][c]))  
                elevators[i].passenger += sequences[i][c];

            if(elevators[i].passenger > 15)
                elevators[i].passenger = 15;

            if((elevators[i].passenger > 0) && (sequences[i][c] > sequences[i][c+1]))
                elevators[i].passenger -= sequences[i][c+1];

            if(sequences[i][c] > sequences[i][c+1])
                elevators[i].usage += sequences[i][c+1];
        }

}


void goToFloor(elevator_t *elevator, int floor){




}   
void printElevators(elevator_t elevators[], int size){

    int i;

    for(i = 0; i < size; i++)
    {   
        printf("Elevator : %d\n", i+1); 
        printf("Floor: %d\n", elevators[i].floor);
        printf("Number of passengers: %d\n", elevators[i].passenger) ;
        printf("Usage: %d\n", elevators[i].usage);
    }
}

int mostUsedElevator(elevator_t elevators[], int size){
    // Incomplete
    return 1;
}

Answer 1

void runElevators(elevator_t elevators[], char sequences[][MAX_LEN], int size)
{
    int i, c;
    int prevFloor, currFloor;

    for(i = 0; i < size; i++)
    {
        for(c = 0; c < strlen(sequences[i]); c++)
        {   
            prevFloor = elevators[i].floor;
            currFloor = sequences[i][c] - '0';

            if (currFloor > prevFloor)
            {
                // Elevator going UP, passengers will enter the elevator
                int numPassengerToEnter;

                // Max capacity of elevator is CAPACITY (=15)
                numPassengerToEnter = CAPACITY - elevators[i].passenger;

                // At floor m, only m passengers (= currFloor) are available (to enter elevator)
                if (numPassengerToEnter < currFloor)
                {
                    elevators[i].passenger += numPassengerToEnter;
                }
                else
                {
                    elevators[i].passenger += currFloor;
                }
            }
            else if (currFloor < prevFloor)
            {
                // Elevator going DOWN, passengers will exit the elevator
                int numPassengerToExit;

                // Smaller of (Current floor number n) and (current number of passenger in elevator) will exit the elevator
                if (elevators[i].passenger < currFloor)
                {
                    numPassengerToExit = elevators[i].passenger;
                }
                else
                {
                    numPassengerToExit = currFloor;
                }

                elevators[i].passenger -= numPassengerToExit;
            }

            // Update current floor of elevator
            elevator[i].floor = currFloor;
        }
}