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

If else statement

#include <stdio.h>
int main ()
{
    char ch;
    int count_a=0, count_b=0, count_c=0, count_other=0;
    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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• pls help me correct the code
• convert into switch-case statement