Question

错误我得到了：“列表未在此范围内定义”[在main（）内部] 我尝试了几件事但结束了失败。我已经阅读了一些范围教程并且没有找到任何内容：\，所以我来到这里，希望有人可以提供帮助。

[CODE：]

#include <iostream>

using namespace std;


const int MAX_LIST_SIZE = 100;
typedef int element;
typedef element list_type[MAX_LIST_SIZE];


void bubble_sort();

int main() {
    cout << list[0] << list[1] << list[2] << list[3] << list[4] << endl;
    return 0;
}

void bubble_sort(list_type list, int n) {

    list[0] = 43;
    list[1] = 20;
    list[2] = 24;
    list[3] = 31;
    list[4] = 36;

    n = 5;
    int j, k;
    bool exchange_made = true;
    element temp;

    k = 0;
    // make up to n- 1 passes through array, exit
    // early if no exchange are made on previous pass
    while((k < n -1 ) && exchange_made) {
        exchange_made = false;
        ++k;
        // number of comparisons on kth pass
        for (j = 0; j < n - k; ++j)
        if(list[j] > list[j + 1]) {
            // exchange must be made!
            temp = list[j];
            list[j] = list[j + 1];
            list[j + 1] = temp;
            exchange_made = true;
        }
   }

}

Answer 1

int main() {

    cout << list[0] << list[1] << list[2] << list[3] << list[4] << endl;
    return 0;
}

好list仅在函数bubble_sort中定义，因此知道main可以访问它的方式。这是一个问题。这是让你入门的东西。

#include <iostream>

using namespace std;


const int MAX_LIST_SIZE = 100;
typedef int element;
typedef element list_type[MAX_LIST_SIZE];


void bubble_sort();

int main() {
    bubble_sort(); //you need to actually CALL bubble_sort for it to do anything
    return 0;
}

void bubble_sort() {
    list_type list; //no need to have the variables as a parameter
    int n = 5;      //just declare them in the scope (inside the function) that you need them in
    list[0] = 43;
    list[1] = 20;
    list[2] = 24;
    list[3] = 31;
    list[4] = 36;

    int j, k;
    bool exchange_made = true;
    element temp;

    k = 0;
    // make up to n- 1 passes through array, exit
    // early if no exchange are made on previous pass
    while((k < n -1 ) && exchange_made) {
        exchange_made = false;
        ++k;
        // number of comparisons on kth pass
        for (j = 0; j < n - k; ++j)
        if(list[j] > list[j + 1]) {
            // exchange must be made!
            temp = list[j];
            list[j] = list[j + 1];
            list[j + 1] = temp;
            exchange_made = true;
        }
   }

    cout << list[0] << list[1] << list[2] << list[3] << list[4] << endl;

}

Answer 2

在您的代码中，您从未向主要块声明list。错误消息清楚地告诉您问题。

Answer 3

您应该定义list。它没有在任何地方定义。

int arr[MAX_LIST_SIZE];

C ++可变范围错误

3 个答案: