C Language Progarm for Case Convertion

#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;

 }

OUTPUT:

Please enter your choice.
(1) for upper to lower conversion.
(2) for lower to upper conversion.
CHOICE:-  1
Please enter a string in upper case.
String will be terminated if you press Ctrl-Z.
STRING:-  FIRSTSOFT TECH^Z
The lower case equivalent is
firstsoft tech
HAVE A NICE DAY! BYE.

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