C++入门程序作业2

程序在Dev-C++5.5.3版本运行

结构体的使用

给结构体赋值，打印出结构体中学生姓名，分数，平均分

#include <iostream>
#include <cassert>
#include <algorithm>
#include <vector>
#include <string.h>//不用.h的话可能下面的strcpy用不了
#include <iterator>
using namespace std;

int main()
{
struct Student //声明结构体类型Student
{

char name[20];
float score1;
float score2;
float score3;
}student1, student2; //定义两个结构体类型Student的变量student1，student2

strcpy(student1.name,"小杨");
student1.score1=60;
student1.score2=70;
student1.score3=80;

strcpy(student2.name,"小李");
student2.score1=96;
student2.score2=97;
student2.score3=98;
int a=0;
a= (student1.score1+student1.score2+student1.score3)/3;
cout<<"学生1姓名："<< student1.name<<endl;
cout<<"科目1："<< student1.score1<<endl;
cout<<"科目2："<< student1.score2<<endl;
cout<<"科目3："<< student1.score3<<endl;
cout<<"科目均分："<< a<<endl;

a= (student2.score1+student2.score2+student2.score3)/3;

cout<<"学生2姓名："<< student2.name<<endl;
cout<<"科目1："<< student2.score1<<endl;
cout<<"科目2："<< student2.score2<<endl;
cout<<"科目3："<< student2.score3<<endl;
cout<<"科目均分："<< a<<endl;
return 0;
}

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C++完成对.txt文件读取,打印所有内容到屏幕上：

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main()
{
ifstream in;
in.open("d:\\haha.txt");//文件每层间一定要用双斜杠隔开
if(!in)
{
cout<<"出错啦"<<endl;
return 1;
}
char ch;
while(!in.eof())
{
in.read(&ch,1);
get(a)

cout<<ch;}
}
in.close();
return 0;
}

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读出.txt文件中学生姓名，分数，平均分

txt文件只需要带有空格，该程序即可区分，txt文件内容如下{

小羊 65 69 68
小李 94 89 98

}

#include <iostream>
#include <fstream>

using namespace std;
struct Student
{

char name[20];
int s1;
int s2;
int s3;
int average;
};
const int N=2;
int main( )
{

int i, stuNum=0;
Student stu[N];
ifstream infile("haha.txt",ios::in);
if(!infile)
{
cout<<"open error!"<<endl;
return 0;
}
i=0;
while(!infile.eof())
{
infile>>stu[i].name>>stu[i].s1>>stu[i].s2>>stu[i].s3;
stu[i].average=(stu[i].s1+stu[i].s2+stu[i].s3)/3;
++stuNum;
++i;
}
infile.close();
//display
for(i=0; i<stuNum; ++i)
{
cout<<stu[i].name<<endl;
cout<<"三科分别为："<<stu[i].s1<<" "<<stu[i].s2<<" "<<stu[i].s3<<" "<<endl;
cout<<"平均分："<<stu[i].average<<endl;

}
return 0;
}