INTER CONVERSION OF CASES OF ALPHABET--USING LOGIC

#include<iostream.h>

#include<conio.h>

char ch;

char cse(char ch)

{

 if((97<=int(ch))&&(int(ch)<=122))

   {

    cout<<"\nThe given character is in lowercase"

      <<"\nThe corresponding uppercase is - ";

    return(char(int(ch)-32));

   }

 else if (65<=int(ch)<=90)

   {

    cout<<"\nThe given character is in uppercase"

      <<"\nThe corresponding lowercase is - ";

    return(char(int(ch)+32));

   }

}

void main()

{

  clrscr();

  cout<<"Enter a character : ";

  cin>>ch;

  cout<<cse(ch);

  getch();

}

.................................................................

OUTPUT:(click to enlarge the image)