C Program to check upper or lower case character without Function.

Program is accepting any character from user. We compare user input with ASCII value of A to Z or a to z. ASCII value of lower case a to z start from 97 to 122. ASCII value of uppercase A to Z start from 65 to 90.

/******************************************************************
Program Name: Write program to check whether given character is a 
digit or character in lowercase or uppercase alphabet without using any function
**********************************************************/
#include<stdio.h>
#include<conio.h>
 void main()
 {
   //variable declaration to store user input
   char ch;
   //ASCII value of a to z is between 97 to 122
   //ASCII value of A to Z is between 65 to 90
   printf("\n\tEnter Character : ");
   ch=getchar();
   if((ch>=48)&&(ch<=57))
     {
      printf("\n\t %c is integer ",ch);
     }
   else
    {
      if((ch>=97)&&(ch<=122))
	   printf("\n\t '%c' is Lowercase alphabet character ",ch);
      else
      {
	if((ch>=65)&&(ch<=90))
	   printf("\n\t '%c' is Uppercase alphabet character ",ch);
	   else
    printf("\n\t '%c' is not alphabet or number",ch);
    }
    }
    getch();
 }

Output

Enter Character : D

'D' is Uppercase alphabet character 

    Enter Character : d
     'd' is Lowercase alphabet character

      
        Enter Character : $
         '$' is not alphabet or number

Enter Character : 1

	 1 is integer