c - A loop to read characters from console till EOF character is encountered using getchar() is not exiting when EOF character is encountered -

this question has answer here:

• why 2 eof needed input? [duplicate] 2 answers
• why require multiple eof (ctrl+z) characters? 5 answers

here program read character console , print them in reverse order.

#include<stdio.h> main() { int ch, count = 0; char a[100]; printf("enter charachters\n"); ch = getchar(); while(ch != eof && count<100) {   a[count] = ch;   count = count+1;   ch = getchar(); } printf("\ncount = %d\n",count); while (count>0) {      count = count -1  ;   putchar(a[count]); } } 

my questinon is: when give eof character (ctrl+d) after typing in few characters on console, not exit out of loop. not add count variable not exit loop. if eof character first character after newline character, read , loop exited. eg if sample input is:

abcdef
abc
ctrl+d

then code works fine if input is:

abcdef ctrl+d

the loop not exited. tell me way accomplish this.
thanks

ctrl-d eot (end of transmission). ctrl-z eof (end of file). isn't specific unix ascii. unix libraries choose interpret eot way signal end of input on character i/o.