C passing entire array to function

Passing entire array to function :

Parameter Passing Scheme : Pass by Reference
Pass name of array as function parameter .
Name contains the base address i.e ( Address of 0th element )
Array values are updated in function .
Values are reflected inside main function also.

#include<stdio.h>
#include<conio.h>
//---------------------------------
void fun(int arr[])
{
int i;
for(i=0;i< 5;i++)
 arr[i] = arr[i] + 10;
}
//--------------------------------
void main()
{
int arr[5],i;
clrscr();
printf("\nEnter the array elements : ");
for(i=0;i< 5;i++)
 scanf("%d",&arr[i]);
printf("\nPassing entire array .....");
fun(arr);  // Pass only name of array
for(i=0;i< 5;i++)
 printf("\nAfter Function call a[%d] : %d",i,arr[i]);
getch();
}

Output :

Enter the array elements : 1 2 3 4 5
Passing entire array .....
After Function call a[0] : 11
After Function call a[1] : 12
After Function call a[2] : 13
After Function call a[3] : 14
After Function call a[4] : 15

Graphical Flowchart :

Passing Entire 1-D Array to Function in C Programming

Array is passed to function Completely.
Parameter Passing Method : Pass by Reference
It is Also Called “Pass by Address“
Original Copy is Passed to Function
Function Body Can Modify Original Value.
Example :

#include<stdio.h>
#include<conio.h>
void modify(int b[3]);
void main()
{
int arr[3] = {1,2,3};
modify(arr);
for(i=0;i<3;i++)
  printf("%d",arr[i]);
getch();
}
void modify(int a[3])
{
int i;
for(i=0;i<3;i++)
  a[i] = a[i]*a[i];
}

Output :

1 4 9

Here “arr” is same as “a” because Base Address of Array “arr” is stored in Array “a”

Alternate Way of Writing Function Header :

void modify(int a[3])

void modify(int *a)