Write a C Program to check whether the Character is Alphabet or Digit by using the Built-in function isalpha, isdigit, and also not using any built-in function. As we all know,
- Alphabet character: Any character between a-z or A-Z.
- Digit: Any character between 0 and 9.
C Program to check whether the Character is Alphabet or Digit
This program allows the user to enter one character. Then it will check whether the user-specified character is an Alphabet or a digit.
In the following program, we used a C else if statement to check multiple conditions.
- The first if statement uses the C logical operator to check multiple expressions. Here, it checks whether the given character is between a and z or A and Z. If true, it’s an alphabet. Otherwise, the compiler moves to the else if block.
- Here, it checks whether the character is between 0 and 9. If true, print the digit.
- Otherwise, print the statement inside the else block.
#include <stdio.h>
int main()
{
char ch;
printf(" Please Enter any character : ");
scanf("%c", &ch);
if( (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') )
{
printf("\n %c is an Alphabet", ch);
}
else if (ch >= '0' && ch <= '9')
{
printf("\n %c is a Digit", ch);
}
else
printf("\n %c is not an Alphabet, or a Digit", ch);
return 0;
}
Let us check whether 7 is an Alphabet or Digit.
Please Enter any character : 7
7 is a DigitLet us check whether $ is an Alphabet or not (which is not TRUE)
Please Enter any character : $
$ is not an Alphabet, or a DigitC program to Check whether the Character is Alphabet or Digit using ASCII Values
In this program, we are using the ASCII values to check whether the input character is Alphabet or Digit. I suggest you refer to the ASCII Table to understand the values of each character in this C Programming.
#include <stdio.h>
int main()
{
char ch;
printf(" Please Enter any character : ");
scanf("%c", &ch);
if (ch >= 48 && ch <= 57)
{
printf("\n %c is a Digit", ch);
}
else if ( (ch >= 65 && ch <= 90) || (ch >= 97 && ch <= 122) )
{
printf("\n %c is an Alphabet", ch);
}
else
printf("\n %c is not an Alphabet, or a Digit", ch);
return 0;
}
Please Enter any character : 7
7 is a DigitLet us check whether # is an Alphabet or not (Not TRUE).
Please Enter any character : #
# is not an Alphabet, or a DigitLet us check whether g is an Alphabet or not (TRUE)
Please Enter any character : g
g is an AlphabetCheck Alphabet or Digit using the isalpha and isdigit functions
In this C program, we are using the built-in functions C isalpha and C isdigit. The isalpha() function checks whether the given character is an alphabet. The isdigit() function checks whether the character is a digit.
#include <stdio.h>
#include<ctype.h>
int main()
{
char ch;
printf(" Please Enter any character : ");
scanf("%c", &ch);
if (isdigit(ch))
{
printf("\n %c is a Digit", ch);
}
else if ( isalpha(ch) )
{
printf("\n %c is an Alphabet", ch);
}
else
printf("\n %c is not an Alphabet, or a Digit", ch);
return 0;
}
Please Enter any character : @
@ is not an Alphabet, or a DigitAlso Read