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isalnum() Test for Alphanumeric Character (Macro)
#include <ctype.h>
int isalnum(c);
int c; Integer to be tested
isalnum() is a macro that tests if 'c' is an alphanumeric character;
that is, if it is included in the sets:
A-Z, a-z, or 0-9
Returns: True (nonzero) if the integer is in one of the sets, and
0 if not. The result is undefined if 'c' is other than
an ASCII character or EOF (i.e., undefined if c > 127).
Notes: isalnum() is a macro.
-------------------------------- Example ---------------------------------
The following statements continue to get input from stdin until a
non-alphanumeric character is read.
#include <ctype.h>
#include <stdio.h>
int x = 0;
char buffer[80];
int ch;
main()
{
while (isalnum(ch = getchar()))
buffer[x++] = ch;
printf("data input from console: %s \n",buffer);
}
See Also:
isalpha()
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