C++ Program to Print Occurence of Characters from ‘a’ to ‘z’ in an Input File

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This C++ Program which prints occurence of characters from ‘a’ to ‘z’ in an Input File. The program creates an input file stream, goes through each character in every line of the file stream and increments each character’s count on every encounter of the specific character.

Here is source code of the C++ program which prints occurence of characters from ‘a’ to ‘z’ in an Input File. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

  1. /*
  2.  * C++ Program to Print Occurence of Characters from 'a' to 'z' in an Input File
  3.  */
  4. #include <iostream>
  5. #include <string>
  6. #include <fstream>
  7. #include <cctype>
  8.  
  9. int main()
  10. {
  11.     int arr[26];
  12.     std::ifstream file("test.cpp");
  13.     std::string str;
  14.  
  15.     for (int i = 0; i < 26; i++)
  16.     {
  17.         arr[i] = 0;
  18.     }    
  19.     while (getline(file, str))
  20.     {
  21.         int i = 0;
  22.         while (str[i] != '\0')
  23.         {
  24.             if (isalpha(str[i]))
  25.                 arr[(str[i] - 'a')]++;
  26.             i++;
  27.         }
  28.     }
  29.     std::cout << "Count of character \'a\' - \'z\'\n";
  30.     for (int i = 0; i < 26; i++)
  31.     {
  32.         char c = 'a' + i;
  33.         std::cout << c << " " << (arr[i] + '0') << "\t";
  34.         if ((i + 1) % 6 == 0)
  35.             std::cout << std::endl;
  36.     }
  37.     std::cout << std::endl;
  38.     file.close();
  39. }

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$ g++ main.cpp
$ ./a.out
Count of character 'a' - 'z'
a 65    b 48    c 65    d 62    e 68    f 58
g 52    h 53    i 86    j 48    k 48    l 62
m 53    n 65    o 60    p 52    q 48    r 73
s 69    t 83    u 57    v 48    w 50    x 48
y 49    z 49

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn