isspace() – C函数
C库函数int isspace(int c)检查传递的字符是否是空白。
标准空白字符:
' '(0x20) space (SPC)' '(0x09) horizontal tab (TAB)' '(0x0a) newline (LF)'v'(0x0b) vertical tab (VT)'f'(0x0c) feed (FF)' '(0x0d) carriage return(CR)
声明
以下是isspace()函数的声明。
int isspace(int c);
参数
-
c -- 这是要检查的字符。
返回值
这个函数返回一个非零值(true)如果c是一个空白字符,否则返回零(false)
例子
下面的例子显示使用isspace()函数的用法。
#include<stdio.h>#include<ctype.h>int main(){int var1 ='t';int var2 ='1';int var3 =' ';if( isspace(var1)){ printf("var1 = |%c| is a white-space character ", var1 );}else{ printf("var1 = |%c| is not a white-space character ", var1 );}if( isspace(var2)){ printf("var2 = |%c| is a white-space character ", var2 );}else{ printf("var2 = |%c| is not a white-space character ", var2 );}if( isspace(var3)){ printf("var3 = |%c| is a white-space character ", var3 );}else{ printf("var3 = |%c| is not a white-space character ", var3 );}return(0);}
让我们编译和运行上面的程序,这将产生以下结果:
var1 = |t| is not a white-space character var2 = |1| is not a white-space character var3 = | | is a white-space character