结构，指针，通过指针获取字段值

Question

I have something similar to this code in my application:

#include <stdlib.h>
#include <stdio.h>

typedef struct STH
{
  double *buff;
  int size;
}STH;

void fun1(STH *s)
{
  fun3(s->buff, s->size);
}

void fun3(double *buff, int n)
{
  int i = 0;
  printf("N = %d\n", n);
  for(i=0; i<n; i++)
     printf("%d\n", buff[i]);
}

void fun2()
{
  STH s;

  s.size = 4;
  s.buff = malloc(sizeof(double) * s.size);

  fun1(&s);
}

int main()
{
    fun2();
    return 0;
}

When I try to print out the buffer in fun3 , gdb says that there is an error in fun3 . When I try to print out (in fun2 ) the value of the s->size , there is an error (instead of 4 it prints out strange numbers ....)

Answer 1

buff[i] is a floating point number, use %f format specifier to print it. Ie use:

printf("%f\n", buff[i]);

instead of

printf("%d\n", buff[i]);

Also you have not initialized your array to some values. It will contain (and print) random values.