C语言isascii()函数:检测字符是否为ASCII字符
头文件:#include <ctype.h>
isascii() 用来检测一个字符是否是ASCII码字符,其原型为:
int isascii(int c);
【参数】c 为需要检测的字符。
【返回值】若 c 为ASCII码(在0 到127 之间),返回非 0 值,否则返回 0。
注意,此为宏定义,非真正函数。
【实例】判断int i 是否具有对应的ASCII 码字符。
125 is an ascii character:}
126 is an ascii character:~
127 is an ascii character:
128 is not an ascii character
129 is not an ascii character
isascii() 用来检测一个字符是否是ASCII码字符,其原型为:
int isascii(int c);
【参数】c 为需要检测的字符。
【返回值】若 c 为ASCII码(在0 到127 之间),返回非 0 值,否则返回 0。
注意,此为宏定义,非真正函数。
【实例】判断int i 是否具有对应的ASCII 码字符。
#include <ctype.h> main(){ int i; for(i = 125; i < 130; i++) if(isascii(i)) printf("%d is an ascii character:%c\n", i, i); else printf("%d is not an ascii character\n", i); }输出结果:
125 is an ascii character:}
126 is an ascii character:~
127 is an ascii character:
128 is not an ascii character
129 is not an ascii character