C++ Program to Print Occurrence of Characters from 'a' to 'z' in a Given File

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.

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/*
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 * C++ Program to Print Occurence of Characters from 'a' to 'z' in an Input File

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 */
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#include <iostream>
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#include <string>
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#include <fstream>
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#include <cctype>
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```
 
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int main()
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{
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    int arr[26];
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    std::ifstream file("test.cpp");
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    std::string str;
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    for (int i = 0; i < 26; i++)
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    {
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        arr[i] = 0;
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    }    
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    while (getline(file, str))
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    {
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        int i = 0;
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        while (str[i] != '\0')
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        {
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            if (isalpha(str[i]))
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                arr[(str[i] - 'a')]++;
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            i++;
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        }
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    }
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    std::cout << "Count of character \'a\' - \'z\'\n";

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    for (int i = 0; i < 26; i++)
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    {
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        char c = 'a' + i;
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        std::cout << c << " " << (arr[i] + '0') << "\t";

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        if ((i + 1) % 6 == 0)
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            std::cout << std::endl;
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    }
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    std::cout << std::endl;
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    file.close();
```
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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