isspace()当str字符串中包含空格

isspace() checks for white-space characters. In the "C" and "POSIX" locales, these are: space, form-feed ('f'), newline ('n'), carriage return ('r'), horizontal tab ('t'), and vertical tab ('v').

函数int isspace ( int c );

用于判断字符c是否是空字符，是空字符返回值为非0，不是空字符返回值为0

例子判断字符串字符是否为空，是空字符，则将空字符替换成'#'

#include<stdio.h>#include<ctype.h>int main(){char c;int i=0;char str[]="isspace test one";while(str[i]){c=str[i];if(isspace(c))c='#';putchar(c);i++;}return 0;}

运行结果：

zdg@ubuntu:/mnt/hgfs/SHAREZDG/C_PROJECT$ ./a.out isspace#test#onezdg@ubuntu:/mnt/hgfs/SHAREZDG/C_PROJECT$