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

int n;
string name[50];
int num[50];


int main()
{   
    void input_data();
    void output_data(string name);
    string name;
    cout<<"please tell me how many students in this class"<<endl;
    cin>>n;
    input_data();
    cout<<"please input the student's name which you want to search" <<endl;
    cin>>name;
    output_data(name);
    return 0;}

void input_data()
{
    int i;
    for(i=0;i<n;i++)
    {    cout <<"input the name and the number of student "<<i+1<<":";
        cin>>name[i];
        cin>>num[i];}
}

void output_data(string name)
{
    int i;
    string studentname;
    int number;
    for(i=0;i<n;i++)
    {    studentname=name[i];
        number=num[i];
        if(studentname==name)
        {cout<< studentname<<"'s student number is "<<number;}}
}

这个程序包含两个子函数input_data and output_data
第一个是为了输入学生的姓名和学号
第二个是用来搜索的...用户输入学生的姓名之后...就会出现对应姓名的学号...
但是我写的这个...连编译都没有问题...
但是最后的一句cout<< studentname<<"'s student number is "<<number;就是不显示...
不知道是什么问题...求解惑....

studentname==name？？
一个对象和一组对象==？？
 if(studentname==name[i])????

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

int n;
string name[50];
int num[50];

void input_data();
void output_data(string name);

int main()
{
    string searchname;
    cout<<"please tell me how many students in this class"<<endl;
    cin>>n;
    input_data();
    cout<<"please input the student's name which you want to search" <<endl;
    cin>>searchname;
    output_data(searchname);
    return 0;
}

void input_data()
{
    int i;
    for(i=0;i<n;i++)
    {   
        cout <<"input the name and the number of student "<<i+1<<":";
        cin>>name[i];
        cin>>num[i];
    }
}

void output_data(string Sname)
{
    int i;
    string studentname;
    int number;
    for(i=0;i<n;i++)
    {   
        if(name[i]==Sname)
        {
            cout<< Sname<<"'s student number is "<<num[i];
        }
    }
}

注意你的命名，变量名和数组名重了！

明白了！多谢多谢！