Counting a text file words in C++ and C, using lists or hash tables

[bigbagy]

Notes
The programs will be compiled and tested on the machine which runs the
Linux operating system. V3.4 of the GNU C/C++ compiler (gcc ,g++) must be used.
A significant amount coding is needed for this assignment.

1.Counting Words in C++

Problem: Write an elegant C++ program to count the number of times each word occurs
in a file. A word is defined as a sequence of characters surrounded by whitespace. Case is
not important, so the word “Run” should be treated the same as “run” or “RUN”.
Input: A text file. Assume the number of words in the input is usually less than 150,000.
The maximum size of a single word is 255 characters.
Output: A printout of all words in the input (one word per line), and their corresponding
reference count. Word ordering is unimportant.
Example: Given the following input text:
See the dog. See the dog run. Run dog, run. That dog can really run.
Your program will produce output resembling the following:
can 1
dog 2
dog, 1
dog. 1
really 1
Run 1
run. 3
See 2
That 1
the 2

Notes:
The program must be written in C++ and will be compiled with g++.
Your code must compile cleanly, must not produce any warnings when –Wall is
specified, and must run without any changes.
Make sure your solution is constructed clearly and idiomatically, so that it adheres
to the commonly accepted definition of good style as discussed in class.
Be sure to properly comment your program; explain how the solution works and
why you selected particular algorithm(s) and data structure(s).
Provide citations to references you may have used in constructing your solution.
Input to the program will come from standard input. Output must be to standard
output. Do not prompt for input, nor produce spurious output.
Your program will be testing in a manner similar to the following (the file names
“input.txt” and “output.txt” are only examples):

2. Counting Words in C

Problem: Redo the previous problem, but instead of an elegant C++ program,
produce an elegant and efficient C program. Since the program is in C, you cannot use
any C++ mechanisms, such as the Standard Template Library (STL) or stream I/O.


Notes:
The program must be written in C and will be compiled with gcc.
The code must compile cleanly, must not produce any warnings when –Wall is
specified, and must run without any changes.
Make sure your solution is constructed clearly and idiomatically, so that it adheres
to the commonly accepted definition of good style as discussed in class.
Be sure to properly comment your program; explain how the solution works and
why you selected particular algorithm(s) and data structure(s).
Provide citations to references you may have used in constructing your solution.
Input to the program will come from standard input. Output must be to standard
output. Do not prompt for input, nor produce spurious output.
Your program will be testing in a manner similar to the following (the file names
“input.txt” and “output.txt” are only examples)

[Jai Vrat Singh]

looks like a school assigment which nobody wil want to do..but just FYH

    1  #include<iostream>
     2  #include<fstream>
     3  #include<map>
     4  #include<ctype.h>
     5  
     6   typedef std::map<std::string, int> StrMap; 
     7  void recordData( StrMap& m, std::string& str);
     8  
     9  int main(int argc, char* argv[]){
    10    if(argc != 2) {
    11      std::cerr<<"FIle name required\n";
    12      exit(-1);
    13    }
    14    StrMap stringMap;
    15    std::string str;
    16  
    17    std::fstream in(argv[1], std::ios::in);
    18    while( in>>str){
    19      recordData(stringMap,str);
    20    }
    21    in.close();
    22  
    23    for(StrMap::const_iterator iter=stringMap.begin(); iter != stringMap.end(); iter++){
    24      std::cerr<<"Key= "<<iter->first<<"  Value ="<<iter->second<<"\n";
    25    }
    26    return(0);
    27  }
    28  
    29  
    30  void recordData( StrMap& m, std::string& str){
    31   std::string s;
    32   for(int i=0; i<str.length(); ++i){
    32   for(int i=0; i<str.length(); ++i){
    33     char ch = str[i];
    34     if(std::isspace(ch)){
    35       if(s.length()>0) m[s]++;
    36       s.clear();
    37     } else{
    38       s += tolower(ch) ;
    39     }
    40   }
    41    if(s.length() > 0 ) m[s]++; 
    42  }
    43  
 
 

Output
[HTML]
/home/jaivrat/cpp/test>cat data
hello mr hello dog
cat ran away with a runaway master
super CaT
/home/jaivrat/cpp/test>./a.exe data
Key= a Value =1
Key= away Value =1
Key= cat Value =2
Key= dog Value =1
Key= hello Value =2
Key= master Value =1
Key= mr Value =1
Key= ran Value =1
Key= runaway Value =1
Key= super Value =1
Key= with Value =1
/home/jaivrat/cpp/test>
[/HTML]

[bigbagy]

Thank you Jai for helping me with this matter.There are tow error messages. Would you please have a look on them? . Because I tried to fix them, but I couldn't. Here are the messages:
--------------------Configuration: Cpp1 - Win32 Debug--------------------
Compiling...
Cpp1.cpp
1-(18) : error C2679: binary '>>' : no operator defined which takes a right-hand operand of type 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' (
or there is no acceptable conversion)

2-(18) : fatal error C1903: unable to recover from previous error(s); stopping compilation
Error executing cl.exe.

Cpp1.obj - 2 error(s), 5 warning(s)

Bigbagy

looks like a school assigment which nobody wil want to do..but just FYH

    1  #include<iostream>
     2  #include<fstream>
     3  #include<map>
     4  #include<ctype.h>
     5  
     6   typedef std::map<std::string, int> StrMap; 
     7  void recordData( StrMap& m, std::string& str);
     8  
     9  int main(int argc, char* argv[]){
    10    if(argc != 2) {
    11      std::cerr<<"FIle name required\n";
    12      exit(-1);
    13    }
    14    StrMap stringMap;
    15    std::string str;
    16  
    17    std::fstream in(argv[1], std::ios::in);
    18    while( in>>str){
    19      recordData(stringMap,str);
    20    }
    21    in.close();
    22  
    23    for(StrMap::const_iterator iter=stringMap.begin(); iter != stringMap.end(); iter++){
    24      std::cerr<<"Key= "<<iter->first<<"  Value ="<<iter->second<<"\n";
    25    }
    26    return(0);
    27  }
    28  
    29  
    30  void recordData( StrMap& m, std::string& str){
    31   std::string s;
    32   for(int i=0; i<str.length(); ++i){
    32   for(int i=0; i<str.length(); ++i){
    33     char ch = str[i];
    34     if(std::isspace(ch)){
    35       if(s.length()>0) m[s]++;
    36       s.clear();
    37     } else{
    38       s += tolower(ch) ;
    39     }
    40   }
    41    if(s.length() > 0 ) m[s]++; 
    42  }
    43  
 
 

Output
[HTML]
/home/jaivrat/cpp/test>cat data
hello mr hello dog
cat ran away with a runaway master
super CaT
/home/jaivrat/cpp/test>./a.exe data
Key= a Value =1
Key= away Value =1
Key= cat Value =2
Key= dog Value =1
Key= hello Value =2
Key= master Value =1
Key= mr Value =1
Key= ran Value =1
Key= runaway Value =1
Key= super Value =1
Key= with Value =1
/home/jaivrat/cpp/test>
[/HTML]

[Jai Vrat Singh]

Thank you Jai for helping me with this matter.There are tow error messages. Would you please have a look on them? . Because I tried to fix them, but I couldn't. Here are the messages:
--------------------Configuration: Cpp1 - Win32 Debug--------------------
Compiling...
Cpp1.cpp
1-(18) : error C2679: binary '>>' : no operator defined which takes a right-hand operand of type 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' (
or there is no acceptable conversion)

2-(18) : fatal error C1903: unable to recover from previous error(s); stopping compilation
Error executing cl.exe.

Cpp1.obj - 2 error(s), 5 warning(s)

Bigbagy

Try including

#include<string>

By mistake i missed it. Pls revert back if it works now..
I was using g++ on cygwin it did not give me errors..

[bigbagy]

Hi Jai;
I included it but it didn't work. Maybe because I'm currently working on windows not linux. Is it a problem if I try to compile it on windows?. please be patient with me until we compile it correctly.

Thank you
bigbagy

Try including

#include<string>

By mistake i missed it. Pls revert back if it works now..
I was using g++ on cygwin it did not give me errors..