c - 这段代码我哪里出错了

Question

int getstring(void)
{
  char *x;
  int i = 0;
  x = malloc(sizeof(char) + 1);
  char ch;
  while ((ch = getchar()) != EOF)
  {
     x[i] = getchar();
     x = realloc(x, sizeof(char) + i + 1);
     i++;
  }
  return *x;
} 

在 main 中使用此函数后，我试图编写一个函数来获取字符串作为输入，但我似乎没有得到输出，这有什么问题？

Answer 1

我是这样做的:

#include <stdio.h>
#include <stdlib.h>
//-----------------------------------
char* getstring(void)
  {
  char *x;
  int i = 0;
  x = malloc(sizeof(char));
  int ch;
  while ( ((ch = getchar()) != EOF) && (i<99))
  {
     x[i] = (char)ch;
     i++;
     x = realloc(x ,sizeof(char)*(i+1));
  }
  x[i]=0;
  return x;
  } 
//-----------------------------------
int main()
  {
  char *s;
  s=getstring();
  printf("\nYou entered : %s\n",s);
  free(s);
  return 0;
  }
//-----------------------------------

/* 

On Ubuntu linux you have to press ENTER and ctrl-d at the end of your keyboard input

output:

user@ubuntu1:~/Desktop/getstr$ ./tst
This is a test...

You entered : This is a test...



*/