分配结构数组 [英] assign array of structures

问题描述

大家好，

我在为结构数组赋值时遇到问题

例如让我们声明以下结构;

  typedef   struct  
 {
  float 成员; 
} motor; 

现在下一步是声明一个类型 motor的数组

 motor joint [ 4 ]; 

现在如果我指定会员这样没有问题;

<前lang =c ++>联合[ 1 ]。member = < span class =code-digit> 10 ;
printf（ ％f，联合[ 1 ]。member）;

但如果我通过函数指定成员，则值为= 0.0
例如;

  float  calculate_torque（motor motor_array []， int  index，some input）
 {
  float  temp_value; 
  //  函数正文 
 返回 temp_value; 
} 

现在，如果我像这样分配

 joint [ 1 ]。member = calculate_torque（joint， 1 ， //  其他输入）;  
 printf（  ％f，联合[ 1 ]。member）; 

值仍然= 0.0 ;



我不是什么问题，或者我错过了什么，

提前谢谢，

z3ngew

解决方案

很明显，在您的代码中，您没有显示，当您计算扭矩时，您不会将其保存到temp_value或不要将计算出的答案分配给temp_value，因此temp_value的原始值仍为= 0;



temp_value = another_function（joint [index]）;

但看起来索引值没有响应d如果我用
替换它
temp_value = another_function（关节[1]）;



上面的代码行应该按以下方式阅读：



temp_value = another_function（关联[index] .member）;



如果是值您想要计算然后返回的'成员'。

Quote：

float calculate_torque（ motor motor_array []，int index，some input）

{

float temp_value;

//函数体//

返回temp_value;

}

你没有指定 motor_array [index] .member 在函数内部，如果它没有改变就不足为奇了。

Hello everyone,
I have a problem when assigning value to an array of structures
for example let's declare the following structure;

typedef struct
{
   float member;
}motor;

now the next step is to declare an array of of type motor

motor joint[4];

now if i assign member like this there is no problem;

joint[1].member = 10;
printf("%f", joint[1].member);

but if i assign member through a function, the value is = 0.0
for example;

float calculate_torque(motor motor_array[], int index, some input)
{
   float temp_value;
   //body of the function
   return temp_value; 
}

Now, if i assign it like this

joint[1].member = calculate_torque(joint, 1, //other inputs);
printf("%f", joint[1].member);

the value still = 0.0;

I don't what is the problem, or what i am missing,
Thanks in advance,
z3ngew

解决方案

It is pretty obvious that in your code, that you are not showing, that when you calc the torque, you are not saving it to temp_value or don't assign the calculated answer to the temp_value, so the original value of temp_value is still = 0;

temp_value = another_function(joint[index]);
but it looks like the index value is not responding and if i replace it with
temp_value = another_function(joint[1]);

THE ABOVE LINE OF CODE SHOULD READ AS THE FOLLOWING:

temp_value = another_function(joint[index].member);

If it is the value of 'member' that you are looking to calculate and then return.

Quote:

float calculate_torque(motor motor_array[], int index, some input)
{
float temp_value;
//body of the function
return temp_value;
}

You are NOT assigning motor_array[index].member inside the function, so no surprise if it is unchanged.

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