Why am I getting void value not ignored as it ought to be

Question

I have the following function    void getdata int arr    int n         for  int i   0  i  lt  n  i                   int a   srand time NULL            arr i    a            And I call it in main   getdata arr  1024     I get  void value not ignored as it ought to be  but I don t understand what is wrong Why do I get this error

User · Answer

int a   srand time NULL           arr i    a    Should be           arr i    rand      And put srand time NULL   somewhere at the very beginning of your program

User · Answer

The original poster is quoting a GCC compiler error message  but even by reading this thread  it s not clear that the error message is properly addressed - except by  pmg s answer    1  btw     error  void value not ignored as it ought to be  This is a GCC error message that means the return-value of a function is  void   but that you are trying to assign it to a non-void variable   Example   void myFunction             stuff       int main        int myInt   myFunction      Compile error       return 0      You aren t allowed to assign void to integers  or any other type   In the OP s situation   int a   srand time NULL         is not allowed  srand    according to the documentation  returns void   This question is a duplicate of    error  void value not ignored as it ought to be  quot void value not ignored as it ought to be quot  - Qt C   GCC C compile error  void value not ignored as it ought to be   I am responding  despite it being duplicates  because this is the top result on Google for this error message  Because this thread is the top result  it s important that this thread gives a succinct  clear  and easily findable result

User · Answer

void value not ignored as it ought to be    this error occurs when function like srand time NULL   does not return something and you are treating it as it is returning something  As in case of pop   function in queue  if you will store the popped element in a variable you will get the same error because it does not return anything

User · Answer

srand doesn t return anything so you can t initialize a with its return value because  well  because it doesn t return a value  Did you mean to call rand as well

User · Answer

int a   srand time NULL      The prototype for srand is void srand unsigned int   provided you included  lt stdlib h gt    This means it returns nothing     but you re using the value it returns       to assign  by initialization  to a     Edit  this is what you need to do    include  lt stdlib h gt     srand    rand       include  lt time h gt       time        define ARRAY SIZE 1024  void getdata int arr    int n        for  int i   0  i  lt  n  i                  arr i    rand             int main void        int arr ARRAY SIZE       srand time 0        getdata arr  ARRAY SIZE

[c] Why am I getting "void value not ignored as it ought to be"?

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