用指针将字符串逆序输出

Posted 2021-08-12 yangbocsu

用指针将字符串逆序输出

// yangbocsu 2021.07.13
#include<stdio.h>
#ifndef N
#define N 20
#endif	
int main()
{
	char s1[N],s2[N],*p1 = s1,*p2 = s2,s3[2]={'a','b'};
	int length = 0;
	scanf("%s",s1);
	printf("s1 = %s\\n",s1);
	while(*p1 != '\\0')	//统计字符串的长度 
	{
		length ++;
		p1 ++; 
	}
	
	p1 = s1 + length - 1;	//p1 = &s1[length - 1];  将指针移到字符串尾 
	for(;length>=0;p1--,length--,p2++)
	{
		*p2 = *p1;
	} 
	
	*p2 = '\\0'; 
	
	printf("s2 = %s\\n",s2);

	return 0;
}