#include

#include

int main()

{

char* buf = NULL; //動態分配 //char buf[1024]; //指定長度

char ch;

int len = 0,i;

printf("Please input some line:\n");

while(scanf("%c",&ch)==1 && ch!=EOF && ch!="#"){ //定義一個結束符或者ctrl+z/d

//動態的實現

buf = (char*)realloc(buf,sizeof(char)*(len+1));

buf[len++] = ch;

//buf[len++] = ch; //指定長度

}

printf("reverse your input to print:\n");

for(i=len-1;i>=0;i--){

printf("%c",buf[i]);

}

free(buf); //動態清除

return 0;

}