program_9_1.cpp

c++程序设计讲义 cppprograming 含源码

// Program 9.1: Display inputs in reverse order
#include <iostream>

using namespace std;

void GetList(int A[], int MaxN, int &n);
void Swap(int &Value1, int &Value2);
void PutList(const int A[], int n);

// main(): manage extraction, reversal, and display of list
int main() {
    const int MaxListSize = 100;
    int Number[MaxListSize];
    int n;
    cout << "Please input a list, end with \"ctrl+z\"" << endl;
    GetList(Number, MaxListSize, n);
    for (int i = 0; i< n/2; ++i) {
        // swap element from front of list with
        // corresponding element from the end of the list
        Swap(Number[i], Number[n-1-i]);
    }
    PutList(Number, n);
    return 0;
}

// GetList(): extract up to MaxN value from input into A
void GetList(int A[], int MaxN, int &n) {
    for ( n =0; (n<MaxN) && (cin>>A[n]); ++n ) {
        continue;
    }
}

// Swap(): interchange value of parameters
void Swap(int &Value1, int &Value2) {
    int tmp = Value1;
    Value1 = Value2;
    Value2 = tmp;
}

// PutList(): display n elements of A
void PutList(const int A[], int n) {
    for (int i=0; i<n; ++i) {
        cout << A[i] << endl;
    }
}