#include<iostream>
#include<string>
using namespace std;
struct Student
    {
        int num;
        string name;
        int score[3];
    }student[5];
    int t;
void prinf(Student student[t])
{
    cout<<student[t].num<<"   "<<student[t].name<<"   "<student[t].score[0]<<"   "<<
    student[t].score[1]<<"   "<<student[t].score[2]<<endl;   
}
int main()
{
    prinf(Student student[t]);
    for(int i=0;i<5;i++)
    {
     cout<<"请输入第"<<i+1<<"位学生信息"<<endl;
     cin>>student[i].num>>student[i].name;
     for(int j=0;j<3;j++)
     {cin>>student[i].score[j];}
    }
   
    cout<<"学号   姓名   数学   语文   英语"<<endl;
    for(int i=0;i<5;i++)
    {
      prinf(Student student[i]);
    }
}
编写一个函数，打印一个学生的成绩数组，主函数输入，用编写的函数输出

把缩进调好点，比你现在的就是很大的改进了

#include<iostream>
#include<string>
using namespace std;
struct Student
{
        int num;
        string name;
        int score[3];
}student[5];
int t;
void prinf(Student student[t])
{
    cout<<student[t].num<<"   "<<student[t].name<<"   "<student[t].score[0]<<"   "<<
        student[t].score[1]<<"   "<<student[t].score[2]<<endl;  
}
int main()
{
    prinf(Student student[t]);
    for(int i=0;i<5;i++)
    {
        cout<<"请输入第"<<i+1<<"位学生信息"<<endl;
        cin>>student[i].num>>student[i].name;
        for(int j=0;j<3;j++)
        {cin>>student[i].score[j];}
    }
  
    cout<<"学号   姓名   数学   语文   英语"<<endl;
    for(int i=0;i<5;i++)
    {
        prinf(Student student[i]);
    }
}

    cout<<student[t].num<<"   "<<student[t].name<<"   "<student[t].score[0]<<"   "<<
        student[t].score[1]<<"   "<<student[t].score[2]<<endl;

为啥不写成两行呢

没想到

#include<iostream>
#include<string>
using namespace std;
struct Student
    {
        int num;
        string name;
        int score[3];
    }student[5];
    int t;
void prinf(Student student)
{
    cout<<student.num<<"   "<<student.name<<"   "<<student.score[0]<<"   "<<
    student.score[1]<<"   "<<student.score[2]<<endl;   
}
int main()
{
   
    for(int i=0;i<5;i++)
    {
     cout<<"请输入第"<<i+1<<"位学生信息"<<endl;
     cin>>student[i].num>>student[i].name;
     for(int j=0;j<3;j++)
     {cin>>student[i].score[j];}
    }
   
    cout<<"学号   姓名   数学   语文   英语"<<endl;
    for(int i=0;i<5;i++)
    {
      prinf(student[i]);
    }
}
成功了

可以了！但结构体中的string name上机的话会出错哈！因为这个定义c++编译系统一般读不懂的！用char name[30]

嗯，谢谢