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Write a c program to convert a given character into uppercase and vice versa

#include<stdio.h>

#include<conio.h>

#include<ctype.h>

void main()

{

char ch;

clrscr();

printf("Enter a character: ");

ch=getchar();

if(isupper(ch))

{

         ch=tolower(ch);

         printf("The lowercase letter is %c",ch);

}

else

{

         if(islower(ch))

         {

                  ch=toupper(ch);

                  printf("The uppercase letter is %c",ch);

         }

         else

                  printf("The entered character is not an alphabet");

}

getch();

}

Output:

 

run 1:

Enter a character: k

The uppercase letter is K

 

run 2:

Enter a character: D

The lowercase letter is d

 

run 3:

Enter a character: &

The entered character is not an alphabet