范例:
/* 找出str 字符串中为英文字母的字符*/
#include <ctype.h>
main()
{
char str[]=”123c@#FDsP[e?”;
int i;
for (i=0;str[i]!=0;i++)
if(isalpha(str[i])) printf(“%c is an alphanumeric
character\n”,str[i]);
}
执行 c is an apphabetic character
F is an apphabetic character
D is an apphabetic character
s is an apphabetic character
P is an apphabetic character
e is an apphabetic character |