7-5.c

《linux应用开发技术详解》的配套代码

#include < ctype.h>
main()
{
char str[]="123c@#FDsP[e?";
int i;
for (i=0;tr[i]!=0;i++ )
if ( isalnum(str[i])) printf("%c is an alphanumeric character\n",str[i]);
}