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Check input character is alphabet, digit or special character in C
In this section, we will see how to check whether a given character is number, or the alphabet or some special character in C.
The alphabets are from A – Z and a – z, Then the numbers are from 0 – 9. And all other characters are special characters. So If we check the conditions using these criteria, we can easily find them.
Example
#include <stdio.h>
#include <conio.h>
main() {
char ch;
printf("Enter a character: ");
scanf("%c", &ch);
if((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z'))
printf("This is an alphabet");
else if(ch >= '0' && ch <= '9')
printf("This is a number");
else
printf("This is a special character");
}Output
Enter a character: F This is an alphabet
Output
Enter a character: r This is an alphabet
Output
Enter a character: 7 This is a number
Output
Enter a character: # This is a special character
Updated on: 30-Jul-2019
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