我要把一行帶空格的字符串輸入到一個(gè)文件中比如 吧 hello world 輸入到nu.txt文件中怎么用getline？===========================================下面是附加題（做出來(lái)追加分哦~）#include<iostream>#include<fstream>#include<cstring>using namespace std;int main(){char buf1[50],buf2[50],ch;cout<<"請(qǐng)輸入一串字符";cin>>buf1;ofstream outfile("al.txt");if(!outfile){cout<<"文件打開失敗"<<endl;return 1;}outfile<<buf1<<endl;outfile.close();ifstream infile("al.txt");if(!infile){cout<<"文件打開失敗"<<endl;return 1;}while(!infile.eof()){infile.get(ch);if(ch>='a'&&ch<='z'){ch=ch-'a'+'A';}cout<<ch;}ofstream out("a2.txt");if(!out){cout<<"文件打開失敗"<<endl;return 1;}outfile<<buf2<<endl;out.close();infile.close();return 0;}要將一行帶空格的字符寫入a1.txt中，將其讀取并且將所有小寫字母改成大寫，再寫入a2.txt
3 回答
叮當(dāng)貓咪
TA貢獻(xiàn)1776條經(jīng)驗(yàn) 獲得超12個(gè)贊
getline() 語(yǔ)法:
istream &getline( char *buffer, streamsize num );
istream &getline( char *buffer, streamsize num, char delim );
用getline()讀取字符到buffer中，buffer在代碼中通常體現(xiàn)為一個(gè)字符數(shù)組，streamsize num是一次讀入多少個(gè)字符, num - 1個(gè)字符已經(jīng)讀入, 當(dāng)碰到一個(gè)換行標(biāo)志， 碰到一個(gè)EOF， 或者任意地讀入，直到讀到字符delim。delim字符不會(huì)被放入buffer中。delim字符可以自已設(shè)定,默認(rèn)為回車符'/n'
#include <iostream.h>
#include<stdlib.h>
#include <iomanip.h>
#include <fstream.h>
const int N=10;
int main()
{
char str[N];
ifstream fin;
fin.open("data.txt");
if (!fin)
{
cout<<"error "<<endl;
exit(1);
}
while(fin.getline(str,sizeof(str)))
{
cout<<str;
cout<<endl;
}
cout<<endl;
fin.clear();
cin.get();
return 0;
}
紅顏莎娜
TA貢獻(xiàn)1842條經(jīng)驗(yàn) 獲得超13個(gè)贊
該法不唯一哦，參考：
#include<iostream>
#include<fstream>
#include<cstring>
using namespace std;
int main()
{
char buf1[50],buf2[50],ch;
int n=0;//?
cout<<"請(qǐng)輸入一串字符";
cin.getline(buf1,50);
ofstream outfile("al.txt");
if(!outfile)
{
cout<<"文件打開失敗"<<endl;
return 1;
}
outfile<<buf1<<endl;
outfile.close();
ifstream infile("al.txt");
if(!infile)
{
cout<<"文件打開失敗"<<endl;
return 1;
}
while(!infile.eof())
{
infile.get(ch);
if(ch>='a'&&ch<='z')
{
ch=ch-'a'+'A';
}
cout<<ch;
buf2[n++]=ch;//?
}
buf2[n] = '\0';
fstream out("a2.txt",ios::out|ios::trunc);
if(!out)
{
cout<<"文件打開失敗"<<endl;
return 1;
}
out<<buf2<<endl;//?
out.close();
infile.close();
return 0;
}
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