范例:
/*找出字符串str中为十六进制数字的字符*/
#include <ctype.h>
main()
{
char str[]="123c@#FDsP[e?";
int i;
for(i=0;str[i]!=0;i++)
if(isxdigit(str[i])) printf("%c is a hexadecimal
digits\n",str[i]);
}
执行 1 is a hexadecimal digits
2 is a hexadecimal digits
3 is a hexadecimal digits
c is a hexadecimal digits
F is a hexadecimal digits
D is a hexadecimal digits
e is a hexadecimal digits |