#include <stdio.h>
int special_chars(int ch);

int main(void)

{
    int x;
    printf("please enter a some characters, and ctrl + d to quitn");

    special_chars(x);

    return 0;
}

int special_chars(int ch)

{
    int pairsNum = 0;

    while ((ch = getchar()) != EOF)// testing charecters while not end of file.
    {

    if (ch == 'n')// testing if a control charecter, and printing its
     {
        printf("\n ");
        pairsNum++;
     }

    else if (ch == 't')
     {
        printf("\t ");
        pairsNum++;
     }

    else
    {
        printf("%c,%d ", ch, ch);
        pairsNum++;
    }

    if (pairsNum == 10)// counting the number of outputs, and printing a newline when is 10 (limit).
        printf("n");
    }
    return ch;
}

$ cat x
abcdefgh
ijklmnop
qrstuvwxyz

$./program < x
please enter a some characters, and ctrl + d to quit
a,97 b,98 c,99 d,100 e,101 f,102 g,103 h,104 n i,105
j,106 k,107 l,108 m,109 n,110 o,111 p,112 n q,113 r,114 s,115 t,116 u,117 v,118 w,119 x,120 y,121 z,122 n $