Interesting program, but stuck somewhere

I need to output the first name, middle initial and the last name. It is not working. I don't know where I got wrong.

Code:

#include<stdio.h>
#include<string.h>
#include<ctype.h>
/*
Yog R. Panta
Chapter#9: Lowercase to Uppercase
04/27/2005
*/
int main()
{
char letter;
printf("\Please enter 1 in the program to exit the program");
printf("\n-------------------------------------------------");
printf("\nPlease enter a letter: ");
fflush(stdout);
letter=getchar();
if (letter!='1')
{
while(letter!='1')
 {
  if(isalpha(letter)!=0)
  {
   letter=toupper(letter);
   printf("\nValid Entry! The letter in uppercase is: ");
   putchar(letter);
  }
  else if(isalpha(letter)!==0)
   printf("\nSorry, Invalid Entry!");
   getchar();
   printf("\n\nEnter another letter: ");
   fflush(stdout);
   letter=getchar();
 }
}
if(letter=='1')
printf("\nEnd of the program");
return 0;
}

FAQ > Explanations of... > Why fflush(stdin) is wrong
http://faq.cprogramming.com/cgi-bin/...&id=1043284351

If you want to get a whole string instead of just a single character, use scanf(). That function can also read in single characters.

Originally Posted by joshdick

FAQ > Explanations of... > Why fflush(stdin) is wrong
http://faq.cprogramming.com/cgi-bin/...&id=1043284351

Where do you see ffluh(stdin)?

[edit]And to read a string, generally avoid scanf until you really know its issues.
FAQ > How do I... (Level 1) > Get a line of text from the user/keyboard (C)
http://www.eskimo.com/~scs/C-faq/q12.20.html

[oops]And getchar returns an int.

Originally Posted by Dave_Sinkula

Where do you see ffluh(stdin)?

My bad.

[edit]And to read a string, generally avoid scanf until you really know its issues.

A valid point, but I think the poster's intention was to get a program up and running, not make it idiot-proof.

Originally Posted by joshdick

A valid point, but I think the poster's intention was to get a program up and running, not make it idiot-proof.

Ah, the same argument for the use gets.

It is strange that the the prinf statement doesn't work..I have to enter twice to show that message up.

Code:

#include<stdio.h>
#include<string.h>
#include<ctype.h>
/*
Yog R. Panta
Chapter#9: Lowercase to Uppercase
04/27/2005
*/
int main()
{
char letter;
printf("\Please enter 1 in the program to exit the program");
printf("\n-------------------------------------------------");
printf("\nPlease enter a letter: ");
fflush(stdout);
letter=getchar();
if (letter!='1')
{
while(letter!='1')
 {
  if(isalpha(letter)!=0)
  {
	letter=toupper(letter);
   printf("\nValid Entry! The letter in uppercase is: ");
	putchar(letter);
  }
  else if(isalpha(letter)!=0)

	printf("\nSorry, Invalid Entry!");
	printf("\nInvalid Entry!");
	getchar();
	printf("\n\nEnter another letter: ");
	fflush(stdout);
	letter=getchar();
 }
}
if(letter=='1')
printf("\nEnd of the program");
return 0;
}