Determine whether this is a control character.
The function determines whether a given character is a control character. The argument val is the ASCII value for a character.
This function returns non-zero if the given character is alphabetical. Otherwise, it returns zero.
Example
int returni;
char string1[512];
sds_getstring(1,"\nEnter a control character: ",string1);
returni=sds_iscntrl(string1[0]);
if (returni == 0)
sds_printf("\nThe character is NOT a control character. ");
else
sds_printf("\nThe character IS a control character. ");
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Programming Overview of SDS™ (Solutions Development System™)