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Prg. to convert upper case to lower case or lower case to upper case

Prg. to convert upper case to lower case or lower case to upper case
depending on the name it is invoked with as found in argument.

#include <stdio.h>
#include <conio.h>

void lower_to_upper();
void upper_to_lower();
void main()
{
 int n;
 clrscr();
 printf("
Please enter your choice.");
 printf("
(1) for upper to lower conversion.");
 printf("
(2) for lower to upper conversion.");
 printf("
CHOICE:-  ");
 scanf("%d",&n);
 switch (n)
 {
  case 1:
		 {
		printf("Please enter a string in upper case.");
		printf("
String will be terminated if you press Ctrl-Z.");
		printf("
STRING:-  ");
		upper_to_lower();
		break;
		 }

  case 2:
		 {
		printf("Please enter a string in lower case.");
		printf("
String will be terminated if you press Ctrl-Z.");
		printf("
STRING:-  ");
		lower_to_upper();
		break;
		 }
  default:
		printf("ERROR");
 }
 printf("




			HAVE A NICE DAY! BYE.");
 getch();
}
 void upper_to_lower()
 {
  int i,j;
  char c4[80],c3;
  for (i=0;(c3=getchar())!=EOF;i++)
	c4[i]=(c3>='A' && c3<='Z')?('a' + c3 -'A'):c3;
  printf("
The lower case equivalent is ");
  for (j=0;j<i;j++)
	putchar(c4[j]);
  return;
 }

 void lower_to_upper()
 {
  int i,j;
  char c2[80],c1;
  for (i=0;(c1=getchar())!=EOF;i++)
	c2[i]=(c1>='a' && c1<='z')?('A' + c1 -'a'):c1;
  printf("
The upper case equivalent is ");
  for (j=0;j<i;j++)
	putchar(c2[j]);
  return;
 }

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