数组

有一个字符数组的内容为:“student a am i”
改为:“i am a student”
要求:
不能使用库函数
只能开辟有限个空间

#include<stdio.h>
#include<stdlib.h>
void Reversed(char* arr){
	char* start = arr;
	char* end = arr;
	while (*end != '\0'){
		++end;
	}
	--end;
	while (start < end){
		char tem = *start;
		*start = *end;
		*end = tem;
		++start;
		--end;
	}
} 
void Reversed1(char* arr){
	while(*arr != '\0'){
		char* start = arr;
		char* end = arr;
		while (*end != ' '&& *end != '\0'){
			++end;
		}
		--end;
		while (start < end){
			char tem = *start;
			*start = *end;
			*end = tem;
			++start;
			--end;
		}
		while (*arr != ' '&&arr != '\0'){
			++arr;
		}
		if (*arr != '\0'){
			++arr;
		}
	}
}
int main(){
	char arr[] = "student a am i";
	printf("%s\n", arr);
	Reversed(arr);
	printf("%s\n", arr);
	Reversed1(arr);
	printf("%s\n", arr);
	system("pause");
	return 0;

}