C Programming Code Examples
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Program to check uppercase or lowercase characters using library functions
/* Program to check uppercase or lowercase characters using library functions
Logic to check uppercase and lowercase alphabets
Step by step descriptive logic to check uppercase and lowercase alphabets.
Input a character from user. Store it in some variable say ch.
Character is uppercase alphabet if(ch >= 'A' and ch <= 'Z').
Character is lowercase alphabet if(ch >= 'a' and ch <= 'z').
If none of the above conditions met, then character is not alphabet. */
#include <stdio.h>
#include <ctype.h> /* Used for isupper() and islower() */
int main()
{
char ch;
/* Input character from user */
printf("Enter any character: ");
scanf("%c", &ch);
if(isupper(ch))
{
printf("'%c' is uppercase alphabet.", ch);
}
else if(islower(ch))
{
printf("'%c' is lowercase alphabet.", ch);
}
else
{
printf("'%c' is not an alphabet.", ch);
}
return 0;
}
Read formatted data from stdin. Reads data from stdin and stores them according to the parameter format into the locations pointed by the additional arguments. The additional arguments should point to already allocated objects of the type specified by their corresponding format specifier within the format string. In C programming, scanf() is one of the commonly used function to take input from the user. The scanf() function reads formatted input from the standard input such as keyboards. The scanf() function enables the programmer to accept formatted inputs to the application or production code. Moreover, by using this function, the users can provide dynamic input values to the application.
Checks whether c is a lowercase letter. Notice that what is considered a letter may depend on the locale being used; In the default "C" locale, a lowercase letter is any of: a b c d e f g h i j k l m n o p q r s t u v w x y z. Other locales may consider a different selection of characters as lowercase characters, but never characters that returns true for iscntrl, isdigit, ispunct or isspace. For a detailed chart on what the different ctype functions return for each character of the standard ANSII character set, see the reference for the <cctype> header.
Checks if parameter c is an uppercase alphabetic letter. The isupper() function checks whether a character is an uppercase alphabet (A-Z) or not. Function isupper() takes a single argument in the form of an integer and returns a value of type int. Even though, isupper() takes integer as an argument, character is passed to the function. Internally, the character is converted to its ASCII for the check. Notice that what is considered a letter may depend on the locale being used; In the default "C" locale, an uppercase letter is any of: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z. Other locales may consider a different selection of characters as uppercase characters, but never characters that returns true for iscntrl, isdigit, ispunct or isspace.
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