Check if input character is letter, number or special character in C

In this section, we will see how to check whether a given character is a number, letter or some special character in C.

The alphabet is from A – Z and a – z, then the numbers are 0 – 9. All other characters are special characters. So if we check the conditions using these we can find them easily.

Example

#include  #include  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

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