1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
//libraries
#include <fstream> //file IO
#include <iostream>
using namespace std;
//Programmer defined data types
//NONE
//Special compiler dependent definitions
//NONE
//global constants/variables
//NONE
//Programmer defined functions
void introduction(string obj, string ins); //user introduction
void readFile(string iFileName); //reads file
string getFileName(string iOf, string dF); //get name of input and output file
int processLine(int atCnt, string lineFromFile); //checks lines for @
bool isValidEmailChar (char chck); //checks char and validates it
//main program
main()
{
//Data
string objective = "print any line with an @."; //program objective
string instructions = "Input file name to print and count any line with @s in it, hit enter to select default file names"; //user instructions
string iFileName; //input file name
string dFileName = "fileContainingEmails.txt"; //default file name
string oFileName; //output file name
string eKey; //enter key
//user introduction
introduction(objective, instructions);
//input & output file names
iFileName = (getFileName("input", dFileName)); //set input file based on user input from getFileName subprogram
if (iFileName == dFileName) //check if default input name was selected
dFileName = "copyPasteMyEmails.txt"; //set default output file
else //if default wasnt chosen
dFileName = iFileName; //set default output file based on user input from getFileName subprogram
oFileName = (getFileName("output", dFileName)); //set output file based on user input from getFileName subprogram
//output both file names
cout <<"Input file:" << iFileName << endl; //output input file name to console
cout <<"Output file:" << oFileName <<endl; //output output file name to console
//enter to continune
cout << endl << "Press ENTER key to continue: " << endl; //output prompt to press enter
getline(cin, eKey); //user input
//read input file
readFile(iFileName);
//enter to continune
cout << endl << "Press ENTER key to continue: " << endl; //output prompt to press enter
getline(cin, eKey); //user input
}//main
// user introduction
void introduction(string obj, string ins)
{
//data
//obj is the program objective
//ins is the user instructions
//output user introduction
cout << "Objective: This program will " << obj << endl;
cout << "Programmer: Prosper\n";
cout << "Editor(s) used: Notepad\n";
cout << "Compiler(s) used: TDM MinGW\n";
cout << "File: " << __FILE__ << endl;
cout << "Complied: " << __DATE__ << " at " << __TIME__ << endl;
cout << ins << endl << endl;
}//introduction
//getFileName
string getFileName(string iOf, string dF)
{
//data
//iOf is input or output label
//df is default file name
int iV = 0; //checking in filename is valid, 1 is not valid, 0 is not valid
string iFileName; //user input
//output
do
{
cout <<"Enter an " << iOf << " filename [default:" << dF << "]:" ; //output variable prompt
getline(cin, iFileName); //user input
cout << endl; //blank line
//input validation
if (iFileName.length() == 0) //if user pressed enter selecting default
{
iV++; //validate by changing iV to one
}
else if (iFileName.length() >= 5 && iFileName.substr(iFileName.length()-4,4)==".txt") //if input is at least 5 digits long and ends in .txt
{
dF = iFileName; //set default file name to user input
iV++; //validate by changing iV to one
}
else // if input is not valid
{
cout <<"Invalid input. Make sure your file name ends in '.txt'" <<endl; //output user file name error and tryagain
}
}while (iV != 1); //while input is not valid
return dF; //return user input
} //getFileName
//readFile
void readFile(string iFileName)
{
//data
//iFileName is the user-specified input file
string lineFromFile; //current line being checked
int atCnt; //#@ in the file count
//open input file
ifstream fin; //reserve "fin" for use
fin.open(iFileName.c_str()); //open specifed file from user
if (!fin.good()) throw "I/O error"; //if file isnt open output error to console
//
do
{
getline(fin, lineFromFile); //input line from file
atCnt = processLine(atCnt, lineFromFile); //check the line for @s with processLine subprogram
}while (fin.good()); //while there are lines in file to be read
//output # of @s
cout << "Number of valid emails: " << atCnt <<endl; //output @ count returned from processLine subProgram
}//readFile
//processLine
int processLine(int atCnt, string lineFromFile)
{
//data
//atCnt is the # of valid emails in the line being checked
//lineFromFile is the line from file being checked
int i; //loop index
int s;
int e;
int dotPos;
bool hasDot; //checking if input has a dot
string anEmail;
//do this
for (i = 0; i < lineFromFile.length(); i++) //loop to traverse the line from file
{
if (lineFromFile[i] == '@') //checking if char is a @
{
for (s = i - 1; s > -1; s--)
{
if (!isValidEmailChar(lineFromFile[s]))
{
s = s + 1;
break;
}
}
hasDot = false;
for (e = i + 1; e < lineFromFile.length(); e++)
{
if (!isValidEmailChar(lineFromFile[e]))
{
e = e - 1;
break;
}
if (lineFromFile[e] == '.')
{
dotPos = e;
hasDot = true;
}
}
if (s < i && e > i && hasDot == true && dotPos > i + 1)
{
anEmail = lineFromFile.substr(s,e-s);
cout << anEmail << endl; //output line if @ is found
atCnt++; //count the found @
}
}//if
}
return atCnt;
}//processLine
//valid email char
bool isValidEmailChar (char chck)
{
//data
//char chck is the current char being checked
if (chck >= 'a' && chck <= 'z') return true;
if (chck >= 'A' && chck <= 'Z') return true;
if (chck >= '0' && chck <= '9') return true;
if (chck == '@' || chck == '.' || chck == '_' || chck == '+' || chck == '-') return true;
else return false;
}
|
