[英]C++ Selection Sorting String Arrays
我試圖了解選擇排序如何與字符串一起使用。
這是我到目前為止的內容:
#include <iostream>
#include <string>
using namespace std;
// Prototypes
void selectionSort(string arr[], int size);
void showArray(string arr[], int size);
int main() {
const int NUM_NAMES = 20;
string names[NUM_NAMES] = {"Collins, Bill", "Smith, Bart", "Allen, Jim",
"Griffin, Jim", "Stamey, Marty", "Rose, Geri",
"Taylor, Terri", "Johnson, Jill", "Allison, Jeff",
"Looney, Joe", "Wolfe, Bill", "James, Jean",
"Weaver, Jim", "Pore, Bob", "Rutherford, Greg",
"Javens, Renee", "Harrison, Rose", "Setzer, Cathy",
"Pike, Gordon", "Holland, Beth"};
// Insert your code to complete this program
cout << "The names on the list in no particlular order are: ";
showArray(names, NUM_NAMES);
// Calling the sorted array
selectionSort(names, NUM_NAMES);
// Displaying sorted array
cout << "The names in sorted order are: ";
showArray(names, NUM_NAMES);
return 0;
}
// Function to sort the string
void selectionSort(string arr[], int size) {
int startScan, minIndex, minValue;
for (startScan = 0; startScan < (size - 1); startScan++) {
minIndex = startScan;
minValue = arr[startScan];
for (int index = (startScan + 1); index < size; index++) {
if (arr[index] < minValue) {
minValue = arr[index];
minIndex = index;
}
}
arr[minIndex] = arr[startScan];
arr[startScan] = minValue;
}
}
// Function to display the array's conents
void showArray(const int arr[], int size) {
for (int count = 0; count < size; count++) {
cout << arr[count];
cout << "\t\n";
}
}
如果嘗試構建它,它將失敗,並且會顯示錯誤消息。 “沒有匹配功能可調用'selectionSort'。”
但是,如果我嘗試使用int而不是字符串,則可以使它正確編譯和排序。
#include <iostream>
#include <string>
using namespace std;
// Prototypes
void selectionSort(int [], int);
void showArray(const int [], int);
int main() {
const int NUM_NAMES = 8;
int names[NUM_NAMES] = {1,3,5,7,3,5,7,9};
// Insert your code to complete this program
cout << "The names on the list in no particular order are: ";
showArray(names, NUM_NAMES);
// Calling the sorted array
selectionSort(names, NUM_NAMES);
// Displaying sorted array
cout << "The names in sorted order are: ";
showArray(names, NUM_NAMES);
return 0;
}
// Function to sort the string
void selectionSort(int array[], int size) {
int startScan, minIndex, minValue;
for (startScan = 0; startScan < (size - 1); startScan++) {
minIndex = startScan;
minValue = array[startScan];
for (int index = (startScan + 1); index < size; index++) {
if (array[index] < minValue) {
minValue = array[index];
minIndex = index;
}
}
array[minIndex] = array[startScan];
array[startScan] = minValue;
}
}
// Function to display the array's contents
void showArray(const int array[], int size) {
for (int count = 0; count < size; count++) {
cout << array[count];
cout << "\t\n";
}
}
我不太確定字符串排序在哪里出問題。 帶有問題的c ++程序的圖像
編譯錯誤很小。 void selectionSort(int [], int);
接受整數數組,它將對該數組進行排序。 但是您想對字符串數組進行排序。 您已聲明:
string names[NUM_NAMES];
您必須更改排序功能以接受字符串數組。 由於std::string
支持=
, <
, >
, ==
運算符,因此修改非常容易。
void selectionSort(string arr[], int size)
{
int startScan, minIndex;
string minValue;
for(startScan = 0; startScan < (size - 1); startScan++)
{
minIndex = startScan;
minValue = arr[startScan];
for(int index = (startScan + 1); index < size; index++)
{
if(arr[index] < minValue)
{
minValue = arr[index];
minIndex = index;
}
}
arr[minIndex] = arr[startScan];
arr[startScan] = minValue;
}
}
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