Change from if - else statement to switch - case statement in c programming

 while (ch = getchar ( ) != '\n')
        {
        if (ch=='a')
            ++count_a;
        else if (ch=='b')
            ++count_b;
        else if (ch=='c')
            ++count_c;
        else
            ++count_other;
        }

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• This is the original question that given by my teacher (I think some where wrong)
• If there are some where wrong pls correct it
• convert into switch-case statement thank you