我做了一个程序，你输入几个字符（最多10个）。它使你一个列表，计算姓氏的平均长度，告诉多少不同的名字。但问题是，当我输入最后一个数字（10）-它排序我它不正确（像1，10，2，3，4，5，6，7，8，9）。下面我将提出我的代码。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct people {
        char num[2];
        char surname[20];
        char name[10];
    } peoples[10], c;
    
int main()
{
    int i, j, k = 0, l = 0, m = 0, n = 0;
    float  s = 0;
    char str[100];
    system("chcp 1251 > nul");
    
    for (i = 0, j = 0; i < 10; i++, j++)
    {
        printf("Enter number, surname, name %d of your human: ", i + 1);
        gets(str);
        
        while (str[n] != '\n')
        {
            
            if (str[n] != ' ')
            {
                peoples[j].num[k] = str[n];
            }
            else
                break;
                
            n++;
            k++;
        }
        n++;
        k = 0;
        while (str[n] != '\n')
        {
            
            if (str[n] != ' ')
            {
                peoples[j].surname[k] = str[n];
            }
            else
                break;
                
            n++;
            k++;
        }
        n++;
        k = 0;
        while (str[n] != '\n')
        {
            
            if (str[n] != '\0')
            {
                peoples[j].name[k] = str[n];
            }
            else
                break;
                
            n++;
            k++;
        }
        n = 0;
        k = 0;
    }
    
    for (i = 0; i < 10; i++)
    {
        for (j = i + 1; j < 10; j++)
        {
            if (!strcmp(peoples[i].name, peoples[j].name))
                m = 1;
        }
        if (m == 0)
            l++;
        
        m = 0;
        
        s = s + strlen(peoples[i].surname);
    }
    
    for (i = 0; i < 9; i++)
    
        for (j = 0; j < 9; j++)
        
            if (strcmp(peoples[j].num, peoples[j+1].num) > 0)
            {
                c = peoples[j+1];
                peoples[j+1] = peoples[j];
                peoples[j] = c;
            }
        
    for (i = 0; i < 10; i++)
    {
        printf("%s ", peoples[i].num);
        printf("%s ", peoples[i].name);
        printf("%s ", peoples[i].surname);
        printf("\n");
    }
    
    printf("\nYou have %d different names\n", l);
    printf("Avarege lenght of surname is = %f\n", s / 10);
}