文字处理(ctype.h)
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isdigit
<![CDATA[
#include <stdio.h>
#include <ctype.h>
int main(void)
{
int ch;
ch = '9';
if (isdigit(ch)) {
printf("ch=%d\n",ch);
}
return 0;
}
/*
运行结果
ch=57
*/
#include <stdio.h>
#include <ctype.h>
int main(void)
{
int ch;
ch = '8';
if (isalnum(ch)) {
printf("ch=%d\n",ch);
}
return 0;
}
/*
运行结果
ch='8'==> print 56
ch='A'==> print 65
*/
]]>
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