6-13连接两个字符串

#include
int main(){
	int i=0,j=0;
	char s1[222],s2[333];
	printf("请输入第一个字符串：\n");
	gets(s1);//=scanf("%s",s1);
	printf("请输入第二个字符串：\n");
	gets(s2);

	while(s1[i]!='\0')
		i++;
	while(s2[j]!='\0')
		s1[i++]=s2[j++];//这里我没看懂
	s1[i]='\0';//等遍历完
	printf("\nThe new string is:%s\n",s1);
	
		
	return 0;
}