Reads input as a stream of characters until encountering EOF without using isupper and islower functions. - C Data Type

Description

Reads input as a stream of characters until encountering EOF without using isupper and islower functions.

Demo Code

#include <stdio.h>  
#include <ctype.h>  
int main(void)  
{  /*from  w  w w .jav  a2s  .  c om*/
    int ch;  
    unsigned long uct = 0;  
    unsigned long lct = 0;  
    unsigned long oct = 0;  
      
    while ((ch = getchar()) != EOF)  {
         if (ch >= 'A' && ch <= 'Z')  
             uct++;  
         else if (ch >= 'a' && ch <= 'z')  
             lct++;  
         else  
            oct++;  
    }
    printf("%lu uppercase characters read\n", uct);  
    printf("%lu lowercase characters read\n", lct);  
    printf("%lu other characters read\n", oct);  
      
    return 0;  
}

Result

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