我是新手，请帮看下为什么有读不出内存的问题？

#include<stdio.h>
#define N 20
int main(void)
{
    int i,temp;
    char str[N];
    printf("input a string:");
    scanf("%s",&str[N]);
    printf("the source string is:%s",str[i]);
    {
                for(i=0;i<=N-1;i++)
                        temp=str[i];
                        str[i]=str[N-i+1];
                        str[N-i+1]=temp;
                        }
                        //printf("the source string is:%s",str[i]);
                        printf("the reverse string is:%s",str[i]);
                        getchar();
                        return 0;
                        }
 

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