C 字符串拼接

char ch1[] = "abc";
	char ch2[] = "def";

	char ch3[20];
	int i = 0;
	int k = 0;
	while (ch1[i] != '\0')
	{
		ch3[i] = ch1[i];
		i++;
	}
	while (ch2[k] != '\0')
	{
		ch3[k + i] = ch2[k];
		k++;
	}

	ch3[k + i] = '\0';

	printf("%s\n", ch3);


注意: 字符串和字符数组到区别    字符串结尾带有'\0'    字符数组没有'\0'