12) Write a program that displays Upper case and Lower case letters using While Loop.

source file name: UpperLower.C 

void main()

{

char ch;

clrscr();

printf("\n Upper case letters\n ");

ch=65;

while(ch<=90)

{

printf(" %c ",ch);

ch++;

}

printf("\n Lower case letters\n ");

ch=97;

while(ch<=122)

{

printf(" %c ",ch);

ch++;

}

getch();

}

output: