Passing arrays to functions in C programming

Like any other variables, we can also pass entire array to a function. An array name can be named as an argument for the prototype declaration and in function header. When we call the function no need to subscript or square brackets. When we pass array that pass as a call by reference because the array name is address for that array.

/* Program to illustrate passing array to function */

#include<stdio.h>

void display(int) ; /* function prototype */

main( )

{

int num[5] = {100, 20, 40, 15, 33, i ;

clrscr( ) ;

printf (“\n The content of array is \n”) ;

for (i=0; i<5; i++)

display (num[i]) ; /*Pass array element fo fun */

getch{ } ;

}

void display(int n)

{

printf (“\t%d”, n ) ;

}

Output:    

The content of array is

100      20       40       15 3

/* Program to read 10 numbers from keyboard to store these num into array and then calculate sum of these num using function */

#include<stdio.h>

#include<conio.h>

int sum (int a[]) ;

void output (int a[]) ;

main( )

{

int a[10], s, i ;

clrscr( ) ;

printf (“Enter 10 elements : \n”) ;

for (i=0 ; i<=9 ; i++) ;

scanf (“%d”, &a[i]) ;

output (a) ;

s = sum (a) ;

printf (“Sum of array element is :\n”, s) ;

getch( ) ;

}

int sum (int a[ ] )

for (i=0 ; i<=9 ; i++)

n = n+a[i] ;

return (n) ;

}

void output (int a[])

{

int i;

printf (“The elements of array are : \n”) ;

for (i=0 ; i<=9 ; i++) ;

printf (“%d\n”, a[i]) ;

}

Output:

Enter 10 elements:

5          12

15        8

10        20

2          30

8          40

The elements of array are:

5

15

10

2

8

12

8

20

30

40

Sum of array element is : 150

/* Passing two dimensional array as an argument to function */

/* Program to read two matrices A and B of order 2×2 and subtract B from A using function*/

#include<stdio.h>

#include<conio.h>

void input (int t[ ] [2]) ;

void output (int t1[ ] [2]) , int t2[ ] [2] ) ;

main( )

{

int a[2] [2], b[2] [2] ;

clrscr ( ) ;

printf (“Enter first array :\n” ) ;

input(a)

printf (“Enter second array :\n”) ;

output(a,b) ;

getch( ) ;

}

void input (int t[ ] [2])

{

int i,j ;

for (i=0 ; i<=1 ; i++)

for (j=0 ; j<=1 ; j++)

scanf (“%d”, &t [ i] [j]) ;

}

void output (int t1[ ] [2], int t2[ ] [2])

{

int i,j ;

int s[2] [ 2] ;

for (i=0, i<=1 ; i++)

for (j=0 ; j<=1 ; j++)

s[i] [j] = t1[i] [j] – t2[i] [j] ;

for (i=0 ; i<=1 ; i++)

{

for ( ) = 0 ; j<=1 ; j++)

printf(“%d\t”, s[i] [j]) ;

printf(“\n”) ;

}

}

Output:

Enter first array:

4

3

2

4

Enter second array:

1

2

3

4

Subtraction is:

3          1

-1         2

/* Program to illustrate string initialization */

#include<stdio.h>

#include<conio.h>

void main( )

{

char name[ ] = “Er.Ojha” ;

clrscr( ) ;

printf (“Your name is :%s\n”, name)

getch( ) ;

}

Output:

Your name is:

Er.Ojha

/* A program to read a string and check for palindrome */

void main( )

{

char st[40] ;

int len i, pal = 1 ;

clrscr( ) ;

printf (“Enter string of our choice:”) ;

gets(st) ;

len = strlen(st) ;

for (i=0; i<(len 12); i++)

{

if (st[i] ! = st[len-i-1])

pal = 0 ;

}

if (pal = = 0)

printf (“\n The input string is not palindrome”) ;

else

printf (“\n the input string is palindrome”) ;

getch( ) ;

}