实验七

11-7

#include<iostream>
using namespace std;
int main(){
	ios_base::fmtflags original_flags=cout.flags();//纪录初始条件 
	cout<<812<<'|';
	cout.setf(ios_base::left,ios_base::adjustfield);//左对齐 
	cout.width(10);		//设置域宽 
	cout<<813<<815<<'
';
	cout.unsetf(ios_base::adjustfield);		//取消调整 
	cout.precision(2);
	cout.setf(ios_base::uppercase|ios_base::scientific);//用科学计数法输出 
	cout<<831.0;
	cout.flags(original_flags);		//恢复初始化 
	return 0;
} 

11-3

#include<iostream>
#include<fstream>
using namespace std;
int main(){
	ofstream file("text1.txt");
	if(!file){
		cout<<"文件打开失败..."<<endl;
	} 
	file<<"已成功写入文件"<< endl;
	file.close();
	return 0;
} 

11-4

#include<iostream>
#include<fstream>
#include<string>
using namespace std;
int main(){
	ifstream file("text1.txt");
	if(!file){
		cout<<"文件打开失败..."<<endl;
	} 
	string s1;
	file>>s1;
	cout<<s1<<endl;
	file.close();
	return 0;
} 

list.cpp

#include<iostream>
#include<fstream>
#include<vector>
#include<string>
#include<iomanip>
#include<ctime>
using namespace std;
class Student{
	public:
		int num;
		long long int number;
		string names;
		string classes;
};
int main(){
	srand(time(NULL));
	ifstream list("C:\Users\Admin\Desktop\fishc.c\list.txt");
	ofstream roll("C:\Users\Admin\Desktop\fishc.c\roll.txt");
	if(!list){
		cout<<"文件打开失败..."<<endl;
	}
	if(!roll){
		cout<<"文件打开失败..."<<endl;
	}
	vector<Student> data;
	Student newdata;
	while(list>>newdata.num>>newdata.number>>newdata.names>>newdata.classes){
		data.push_back(newdata);
	}
	list.close();
	roll.close();
	char choice;
	cout<<"是否开始点名？YES(Y)/NO(N)"<<endl;
	while(cin>>choice){
		int rollnum;
		if(choice=='N'){
			break;
		} 
		rollnum=rand()%data.size();
		cout<<setw(10)<<left<<data[rollnum].num<<setw(20)<<left<<data[rollnum].number<<setw(10)<<left<<data[rollnum].names<<setw(10)<<left<<data[rollnum].classes<<endl;
		cout<<"是否继续点名？YES(Y)/NO(N)"<<endl;
	}
	return 0;
} 

english.cpp

#include<iostream>
#include<string>
#include<fstream>
using namespace std;
int main(){
	string fielnames;
	cin>>fielnames;
	ifstream ifiel(fielnames);
	if(!ifiel){
		cout<<"文件打开失败...."<<endl; 
	}
	char ch;
	int ch_num=0;
	int word_num=0;
	int l_num=0;
	while(ifiel>>ch){
		if(ch==' '||ch==','||ch=='.'||ch=='!'||ch=='?'){
			word_num++;
			ch_num++;
		}else if(ch=='
'){
			l_num++;
		}else{
			ch_num++;
		}
	}
	cout<<"ch="<<ch_num<<" word="<<word_num<<" line="<<l_num<<endl;
	ifiel.close();
	return 0;
}