C Programming - Arrays - Discussion

arr[1]={10};
Is the same as
arr[3]={5,69};
The first example is saved in memory like this;

arr[0]=10 and arr[1]=0 why equal to zero this is referred to the basics of the array you initialize the array in the same line of declaration the non initialized elements will be initialized by def to zero

The second example will be saved in memory like this;
arr[0]=5, arr[1]=69 and arr[2]= 0
And also to print contents of any array using for loop as a example
for (int i=0;i<3;i++)
printf("%d\n", arr[i]); //or printf("%d\n", i[arr]);

I hope you understand my simple explanation

I am getting this output is 1010 why?

I think there is an error, arr[1], initializes an array with only 1 element, not two.

Yes, arr[i] and i[arr] is same.

Is arr[i] and i[arr] same?

Here, arr[1]=10;

It means that the value 10 is initialized to an array arr[] with index 1. The values arr[0] and arr[2] is not initialized if we want to access those elements then it will give the garbage values.

@MOON. It will be 6 if you will give 7 then it will print garbage value.

int main()
{
int arr[7] = {1,2,3,4,5,6,7};
printf("%d\n",6[arr]);
return(0);
}

Output: 7

#include<stdio.h>
int main()
{
int arr[7] = {1,2,3,4,5,6,7};
printf("%d\n",7[arr]);
return(0);
}

why it return's 2?

The first thing is that array is of size 1.

arr[i]=*(arr+i)

i[arr]=*(i+arr)

So, 0[arr]=arr[0]

That's why answer is 10.

arr[1]=10 means {0,10},
or arr[1]=10 means {10,0};
which one is true?
and arr[1] has length 1 or 2;