标签归档：排序

字符串排序函数（单词排序，唯一）

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本程序演示：怎样将一个string字符串输入到一个vector中，每个元素对应一个单词。

// sort and unique
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using std::cin;
using std::cout;
using std::ends;
using std::endl;
using std::string;
using std::vector;
using std::sort;

void show(vector<string> const &words);
void elimDups(vector<string> &words);
int main(void)
{
        string str("the quick red fox jumps over the slow red turtle");
        //string str("");

        string separators = " \t:;,\v\n\r\f";
        string word;
        vector<string> vec;
        std::string::size_type startPos = 0, endPos = 0;
        std::string::size_type /*count = 0,*/ wordLen = 0;
        while ((startPos = str.find_first_not_of(separators, endPos))
                != std::string::npos) {
//              ++count;
                endPos = str.find_first_of(separators, startPos);
                if (endPos == std::string::npos) {
                        wordLen = str.size() - startPos;
                } else {
                        wordLen = endPos -startPos;
                }
                word.assign(str.begin() + startPos,
                        str.begin() + startPos + wordLen);
                vec.push_back(word);
        }
        // show vec info
        show(vec);

        elimDups(vec);

        return 0;
}

void elimDups(vector<string> &words)
{
        sort(words.begin(), words.end());
        show(words);
        auto end_unique = unique(words.begin(), words.end());
        show(words);
        words.erase(end_unique, words.end());
        show(words);
}

void show(vector<string> const &words)
{
        for (auto s : words)
                cout << s << " ";
        cout << endl;

        return;
}

程序输出：

[lhf@localhost study]$ ./23
the quick red fox jumps over the slow red turtle
fox jumps over quick red red slow the the turtle
fox jumps over quick red slow the turtle the red
fox jumps over quick red slow the turtle

将文件输入信息按身高排列

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文件信息

将下列信息保持为hw.dat文件

Aiba 160 59.3
Kurata 162 51.6
Masaki 182 76.5
Tanaka 170 60.7
Tsuji 175 83.9
Washio 175 72.5

将该文件与下列c代码文件放在同一个文件目录内，编译下列c代码，生产可执行文件，执行文件排序显示

#include <stdio.h>

typedef struct gstudent {
	char 	name[128];
	double 	height;
	double 	weight;
} student;

int get_num(FILE *file);
void swap(student *pa, student *pb);
void bubble(student data[], int len);

int main(void)
{
	FILE *fp;

	fp = fopen("hw.dat", "r");
	double 	hsum = 0.0;
	double 	wsum = 0.0;
	int 	num = get_num(fp);
	student stu[num];
	
	if ((fp = fopen("hw.dat", "r")) == NULL) {
		puts("\afile open failed");
	} else {
		int i = 0;
		while (fscanf(fp, "%s%lf%lf", stu[i].name, 
			&stu[i].height, &stu[i].weight) == 3)
			i++;

		bubble(stu, num);

		for (i = 0; i < num; i++) {
			printf("%-10s %5.1f %5.1f\n", stu[i].name, 
				stu[i].height, stu[i].weight);	
			hsum += stu[i].height;
			wsum += stu[i].weight;
		}
		puts("---------------------------");
		printf("average    %5.1f %5.1f\n", hsum / num, wsum / num);
		fclose(fp);
	}

	return 0;
}

int get_num(FILE *fp)
{
	int cnt = 0;
	char name[128];
	double height, weight;
	while (fscanf(fp, "%s%lf%lf", name, &height, &weight) == 3)
		cnt++;

	return cnt;
}

void swap(student *pa, student *pb)
{
	student tmp = *pa;
	*pa = *pb;
	*pb = tmp;

	return;
}

void bubble(student data[], int len)
{
	while (len > 0) {
		int i;
		for (i = 0; i < len - 1; i++)
			if (data[i].height > data[i + 1].height)
				swap(&data[i], &data[i+1]);
		len = i;
	}

	return;
}

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