Home/ Questions/The complete guide to the error: void value not ignored as it ought to be c++ issue
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Tiago Guillot
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Asked: 2022-05-18T10:56:17+00:00 In:

The complete guide to the error: void value not ignored as it ought to be c++ issue

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Here is the program I run:

void getdata(int arr[], int n)
 {
 
  for (int i = 0; i < n; i++) 
  {
  int a = srand(time(NULL));
  arr[i] = a;
  }
 }

getdata(arr, 1024);

After I run, it returns an error:

void value not ignored as it ought to be

Does anyone have any suggestions for the problem below: error: void value not ignored as it ought to be c++ in the c – How to correct it?

void value not ignored as it ought to be c++
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2 Answers

  1. Best Answer
    Expert

    The cause:

    This error happens becausesrand does not return anything, but you are trying to trick it as if it returns a value.

    Solution:

    This error will be fixed if you replace

    int a = srand(time(NULL))
arr[i] = a;

    by

    arr[i] = rand();

    srand(time(NULL)) also need to be placed at the beginning of your program.

    • 11
  2.  int a = srand(time(NULL));

    void srand(unsigned int) is the prototype srand (assuming you include <stdlib.h>). It returns nothing, but you are using the (???) value it returns. To assign a by initialization


    Edit: This is what you should do:

    #include <stdlib.h> /* srand(), rand() */
#include <time.h> /* time() */

#define ARRAY_SIZE 1024

void getdata(int arr[], int n)
{
 for (int i = 0; i < n; i++)
 {
 arr[i] = rand();
 }
}

int main(void)
{
 int arr[ARRAY_SIZE];
 srand(time(0));
 getdata(arr, ARRAY_SIZE);
 /* ... */
}
    • 21

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