Question

How to use isalnum() function to check whether a character is a digit, an uppercase or lowercase in C

Answer 1

#include <stdio.h>
#include <ctype.h>
 
int main(void)
{
    char s[] = "Unreal Engine 4 - DirectX 12";
	int i = 0;
	
	while (s[i])
	{
		if (isalnum(s[i])) 
			printf("%c is digit/uppercase/lowercase\n", s[i]);
		i++;
	}
    return 0;
}
 
  
/*
    
run:
    
U is digit/uppercase/lowercase
n is digit/uppercase/lowercase
r is digit/uppercase/lowercase
e is digit/uppercase/lowercase
a is digit/uppercase/lowercase
l is digit/uppercase/lowercase
E is digit/uppercase/lowercase
n is digit/uppercase/lowercase
g is digit/uppercase/lowercase
i is digit/uppercase/lowercase
n is digit/uppercase/lowercase
e is digit/uppercase/lowercase
4 is digit/uppercase/lowercase
D is digit/uppercase/lowercase
i is digit/uppercase/lowercase
r is digit/uppercase/lowercase
e is digit/uppercase/lowercase
c is digit/uppercase/lowercase
t is digit/uppercase/lowercase
X is digit/uppercase/lowercase
1 is digit/uppercase/lowercase
2 is digit/uppercase/lowercase

*/

 

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