Are the values always equal to zero in this case?

Question

1.00/5 (1 vote)

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In this case , does the output always produce zeros?

Output I have got:
0
0
0
0
0

What I have tried:

C#

#include<stdio.h>
int main()
{
    int i=0;
    int a[5]={};
    for(i=0;i<=4;i++)
    {
        printf("%d\n",a[i]);
    }
    return 0;
}

Posted 27-Apr-21 19:18pm

_-_-_-me

Updated 27-Apr-21 20:18pm

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Comments

CPallini 28-Apr-21 2:12am

It is already difficult to produce correct code using predictable features of the language, why do you insist on the unpredictables?

_-_-_-me 28-Apr-21 2:31am

I am new to programming. I don't know anything. As I was studying the lecture class, it was given that when we initialize the number of elements less than the size of array, the remaining elements will be initialized to zero. So , I got the doubt that what would happen when no elements are given to initialize.

Thank you!!!

Richard MacCutchan 28-Apr-21 3:44am

"I am new to programming. I don't know anything."
Then you should do what a number of people have already suggested and get a copy of the c programming language 3rd edition - Google Search[^], and actually learn it.

_-_-_-me 28-Apr-21 10:15am

Thank you very much!
I downloaded the book "programming in c(3rd Edition) by stephen kochan ".
Is this the good one?
I will start learning it now .
Thank you very much!

2 solutions

Solution 2

See, for instance: gcc - Is an empty initializer list valid C code? - Stack Overflow[^].

Posted 27-Apr-21 20:18pm

CPallini

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OriginalGriff · Accepted Answer · 2021-04-27T19:56:00

Solution 1

Depends on the compiler, and on compiler options: some do always clear arrays when they are created, some don't - and in the later case it won't.

Technically, it's part of the C standard that this code:

C++

type name[size] = {};

will produce an initialized array - but not all compilers are 100% compliant.

If you are concerned about portability, you should probably explicitly use C library function - memset() - Tutorialspoint[^] to preset your array before you use it.

Posted 27-Apr-21 19:56pm

OriginalGriff

Comments

CPallini 28-Apr-21 2:17am

5.However, technically it doesn't look 'part of the C standard' (compiled di -pedantic, as suggested on SO page :-D) :

foo.c: In function ‘main’:
foo.c:5:14: warning: ISO C forbids empty initializer braces [-Wpedantic]
    5 |     int a[5]={};

OriginalGriff 28-Apr-21 2:23am

Oops! My mistake - I thought it was. But in my defence, it's been many decades since I read the C spec! :laugh:

Mind you, it's been decades since I last used C for anything as well ...