In C is there a pattern for variables in an array which are assigned 0 value? -

i want know if array of int elements declared in c. there pattern according values of array assigned 0 while others store garbage values? ex:

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

after compile , run program output,i.e.

0 0 4195344 0 2107770384 

so zeroes there in a[0], a[1] , a[3] while a[2] contains same value each time compiled , run whereas a[4] value keeps on changing (including negative numbers). why happen fixed indices of array initialized 0 , have related past allocation of memory space?

this behaviour undefined , merely coincidence. when declare array on stack , not initialize array take on values (likely previous) stack frame.

aside: if wanted zero-fill array declared on stack (in constant time) can initialize using following initialization syntax:

int arr[ 5 ] = { 0 }; 

it write first element 0 , zero-fill rest of elements. however, if declared uninitialized array globally automatically zero-filled.