C/ctype.h/isblank
int isblank(int ch)
//Declaration: int isblank(int ch);
//Return: returns nonzero if ch is blank.
By default, the blank characters are space and horizontal tab.
#include <ctype.h>
#include <stdio.h>
int main(void)
{
char ch;
for(;;) {
ch = getchar();
if(ch == ".") {
break;
}
if(isblank(ch)){
printf("%c is a word separator\n", ch);
}
}
return 0;
}
/*
q
q is a letter
w
w is a letter
q
q is a letter
.
*/