Append a record to the end of a text file: Difference between revisions
Append a record to the end of a text file (view source)
Revision as of 18:44, 29 December 2018
, 5 years ago→{{header|C sharp|C#}}
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</pre>
=={{header|C
{{trans|C#}}
<lang cpp>#include <iostream>
#include <fstream>
#include <string>
#include <vector>
std::ostream& operator<<(std::ostream& out, const std::string s) {
return out << s.c_str();
}
struct gecos_t {
std::string fullname, office, extension, homephone, email;
friend std::ostream& operator<<(std::ostream&, const gecos_t&);
};
std::ostream& operator<<(std::ostream& out, const gecos_t& g) {
return out << g.fullname << ',' << g.office << ',' << g.extension << ',' << g.homephone << ',' << g.email;
}
struct passwd_t {
std::string account, password;
int uid, gid;
gecos_t gecos;
std::string directory, shell;
passwd_t(const std::string& a, const std::string& p, int u, int g, const gecos_t& ge, const std::string& d, const std::string& s)
: account(a), password(p), uid(u), gid(g), gecos(ge), directory(d), shell(s)
{
//empty
}
friend std::ostream& operator<<(std::ostream&, const passwd_t&);
};
std::ostream& operator<<(std::ostream& out, const passwd_t& p) {
return out << p.account << ':' << p.password << ':' << p.uid << ':' << p.gid << ':' << p.gecos << ':' << p.directory << ':' << p.shell;
}
std::vector<passwd_t> passwd_list{
{
"jsmith", "x", 1001, 1000,
{"Joe Smith", "Room 1007", "(234)555-8917", "(234)555-0077", "jsmith@rosettacode.org"},
"/home/jsmith", "/bin/bash"
},
{
"jdoe", "x", 1002, 1000,
{"Jane Doe", "Room 1004", "(234)555-8914", "(234)555-0044", "jdoe@rosettacode.org"},
"/home/jdoe", "/bin/bash"
}
};
int main() {
// Write the first two records
std::ofstream out_fd("passwd.txt");
for (size_t i = 0; i < passwd_list.size(); ++i) {
out_fd << passwd_list[i] << '\n';
}
out_fd.close();
// Append the third record
out_fd.open("passwd.txt", std::ios::app);
out_fd << passwd_t("xyz", "x", 1003, 1000, { "X Yz", "Room 1003", "(234)555-8913", "(234)555-0033", "xyz@rosettacode.org" }, "/home/xyz", "/bin/bash") << '\n';
out_fd.close();
// Verify the record was appended
std::ifstream in_fd("passwd.txt");
std::string line, temp;
while (std::getline(in_fd, temp)) {
// the last line of the file is empty, make sure line contains the last record
if (!temp.empty()) {
line = temp;
}
}
if (line.substr(0, 4) == "xyz:") {
std::cout << "Appended record: " << line << '\n';
} else {
std::cout << "Failed to find the expected record appended.\n";
}
return 0;
}</lang>
{{out}}
<pre>Appended record: xyz:x:1003:1000:X Yz,Room 1003,(234)555-8913,(234)555-0033,xyz@rosettacode.org:/home/xyz:/bin/bash</pre>
=={{header|C sharp|C#}}==
<lang csharp>using System;
using System.IO;
| |||