<ctype.h>中。int isspace(int c);
#include <stdio.h>
#include <ctype.h>
int main() {
char str[] = "Hello\tWorld\n! ";
for(int i = 0; str[i] != '\0'; i++) {
if(isspace(str[i])) {
printf("Character at index %d is a whitespace character.\n", i);
} else {
printf("Character at index %d is NOT a whitespace character.\n", i);
}
}
return 0;
}
输出结果为：
Character at index 0 is NOT a whitespace character.
Character at index 1 is NOT a whitespace character.
Character at index 2 is NOT a whitespace character.
Character at index 3 is NOT a whitespace character.
Character at index 4 is NOT a whitespace character.
Character at index 5 is a whitespace character.
Character at index 6 is NOT a whitespace character.
Character at index 7 is NOT a whitespace character.
Character at index 8 is NOT a whitespace character.
Character at index 9 is NOT a whitespace character.
Character at index 10 is NOT a whitespace character.
Character at index 11 is a whitespace character.
Character at index 12 is NOT a whitespace character.
Character at index 13 is a whitespace character.
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