Syntax
#include <ctype.h> int isascii(int c);Description
isascii tests if an integer is within the ASCII range. This macro assumes that the system uses the ASCII character set.
Note: In earlier releases of C Set ++, isascii began with an underscore (_isascii). Because it is defined by the X/Open standard, the underscore has been removed. For compatibility, The Developer's Toolkit will map _isascii to isascii for you.
isascii returns a nonzero value if the integer is within the ASCII set, and 0 if it is not.
This example tests the integers from 0x7c to 0x82, and prints the corresponding ASCII character if the integer is within the ASCII range.
#include <stdio.h>
#include <ctype.h>
int main(void)
{
int ch;
for (ch = 0x7c; ch <= 0x82; ch++) {
printf("%#04x ", ch);
if (isascii(ch))
printf("The ASCII character is %c\n", ch);
else
printf("Not an ASCII character\n");
}
return 0;
/****************************************************************************
The output should be:
0x7c The ASCII character is |
0x7d The ASCII character is }
0x7e The ASCII character is ~
0x7f The ASCII character is
0x80 Not an ASCII character
0x81 Not an ASCII character
0x82 Not an ASCII character
****************************************************************************/
}
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