#include "touwenjian.h"
struct Hero
{
    string name;
    int age;
    string sex;
};
//冒泡排序，将年龄大的排到后面
void bubblesort(struct Hero heroArray[], int len)
{
    for (int len=0;len>=1;len--)
    {
        for (int start=1;start<=len;start++)
        {
            if (heroArray[start-1].age>heroArray[start].age)
            {
                struct Hero tmp=heroArray[start];
                heroArray[start]=heroArray[start-1];
                heroArray[start-1]=tmp;
            }
        }
    }
}
//打印排序后的英雄名字
void printArray(struct Hero heroArray[],int len)
{
    for (int i=0;i<len;i++)
    {
        cout<<heroArray[i].name;
    }
}
int main()
{
//5个英雄结构体
    struct Hero heroArray[5]=
    {
        {"刘备",23,"男"},
        {"关羽",100,"男"},
        {"张飞",20,"男"},
        {"赵云",150,"男"},
        {"貂蝉",88,"女"}
    };
    int len=sizeof(heroArray)/sizeof(heroArray[0]);
    //调用函数
    bubblesort(heroArray,len);
    printArray(heroArray,len);
    system("pause");
    return 0;
}

    for (;len>=1;len--)
    {
        for (int start=1;start<len;start++)

假如在你源码上改

#include <iostream>
#include <string>
using namespace std;

struct Hero
{
    std::string name;
    int age;
    std::string sex;
};

void bubble_sort( struct Hero heroArray[], size_t len )
{
    for( size_t i=len; i!=0; --i )
    {
        for( size_t j=1; j!=len; ++j )
        {
            if( heroArray[j-1].age > heroArray[j].age )
            {
                std::swap( heroArray[j-1].name, heroArray[j].name );
                std::swap( heroArray[j-1].age,  heroArray[j].age );
                std::swap( heroArray[j-1].sex,  heroArray[j].sex );
            }
        }
    }
}

void print_array( const struct Hero heroArray[], size_t len )
{
    for( size_t i=0; i!=len; ++i )
    {
        cout << heroArray[i].name << '\n';
    }
}

int main( void )
{
    struct Hero heroArray[5]=
    {
        {"刘备",23,"男"},
        {"关羽",100,"男"},
        {"张飞",20,"男"},
        {"赵云",150,"男"},
        {"貂蝉",88,"女"}
    };
    size_t len = sizeof(heroArray)/sizeof(heroArray[0]);
    bubble_sort( heroArray, len );
    print_array( heroArray, len );

    return 0;
}

假如用C++正正经经地写

#include <string>

struct Hero
{
    std::string name;
    int age;
    std::string sex;
};

#include <iostream>
#include <algorithm>
using namespace std;

int main( void )
{
    struct Hero heros[] = { {"刘备",  23, "男"}
                          , {"关羽", 100, "男"}
                          , {"张飞",  20, "男"}
                          , {"赵云", 150, "男"}
                          , {"貂蝉",  88, "女"} };

    sort( begin(heros), end(heros), [](const auto& a,const auto& b){return a.age<b.age;} );
    for( const auto& e : heros )
        cout << e.name << '\n';
}