判断字符串中第一位字符是否是ASCII字符（ 0–127）,ASCII字符占一个字节

// Note:Your choice is C++ IDE#include <iostream>using namespace std;#define NULL 0bool IsASCIIChar(char *pszStr);int main(){        printf("%s \n", IsASCIIChar("hello") ? "true" : "false");    printf("%s \n", IsASCIIChar("中国")  ? "true" : "false");        return 0;}bool IsASCIIChar(char *pszStr){if(pszStr == NULL){return false;}// 判断字符串中第一位字符是否是ASCII字符（ 0–127）,ASCII字符占一个字节return ((unsigned char)pszStr[0] & 0x80 ) == 0x80 ?  false : true;}