Header file:
ctype.h
Synopsis:
int isalnum(int c)
Description:
Checks whether the given input is an alphanumeric character or not.
Return Value:
TRUE(a non-zero value) on success
0 on failure
isalnum function C example
#include<stdio.h>
#include<ctype.h>
int main() {
char c;
printf("Enter your input:");
c = getchar();
if (isalnum(c))
printf("The given input is alphanumberic\n");
else
printf("The given input is not alphanumeric\n");
printf("The return value from isalnum: %d\n", isalnum(c));
return 0;
}
#include<ctype.h>
int main() {
char c;
printf("Enter your input:");
c = getchar();
if (isalnum(c))
printf("The given input is alphanumberic\n");
else
printf("The given input is not alphanumeric\n");
printf("The return value from isalnum: %d\n", isalnum(c));
return 0;
}
Output:
Enter your input:8
The given input is alphanumberic
The return value from isalnum: 8
The given input is alphanumberic
The return value from isalnum: 8
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