[C++知识库]几种实现字符串反转的方式 C语言

void reverse_str01(char* str){
	int i,len,mid,temp; 
	len = strlen(str);
	mid = len%2==0 ? len/2 : len/2+1;
	for(i=0;i<mid;i++){
		temp = str[i];
		str[i] = str[len-i-1];
		str[len-i-1] = temp;
	}
}

void reverse_str02(char* str){
	int len,start,end;
	len = strlen(str);
	start = 0;
	end = len - 1;
	while(start<end){
		char temp = str[start];
		str[start++] = str[end];
		str[end--] = temp;
	}
}

// 利用指针方式
void reverse_str03(char* str){
	int len = strlen(str);
	char *start = str; // 指向第一个字符的指针
	char *end = str + len - 1; // 指向最后一个字符的指针
	while(start<end){
		char temp = *start;
		*start++ = *end;
		*end-- = temp;
	}
}

void reverse_str04(char* str){
	char *p1, *p2;
	for (p1 = str, p2 = str + strlen(str) - 1; p2 > p1; ++p1, --p2){
		*p1 ^= *p2;
		*p2 ^= *p1;
		*p1 ^= *p2;
	}
}

int main(){
	char str[] = "abcdefg";
	// reverse_str01(str);
	// reverse_str02(str);
	// reverse_str03(str);
	reverse_str04(str);
	printf("%s\n",str);
	return 0;
}