how to pass 2d array to a function by pointer.

we can pass 2d array to a function by two methods.-

Program to find sum of all element of a aray:

1) first method:-

 #include<stdio.h>

int fun(int a[][3]); // function declaration

void main()

{

int a[3][3],i,j,total_sum;

printf("Enter array element ");

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

scanf("%d",&a[i][j]);

}

}

total_sum=fun(a); // function calling

printf("Sum of all element is %d",total_sum);

}

// function definition

int fun(int a[][3])

{

int i,j,sum=0;

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

sum=sum+a[i][j];

}

}

return sum;

}

2) method second:

#include<stdio.h>

int fun(int (*p)[][3]); // function declaration

void main()

{

int a[3][3],i,j,total_sum;

printf("Enter array element ");

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

scanf("%d",&a[i][j]);

}

}

total_sum=fun(a); // function calling

printf("Sum of all element is %d",total_sum);

}

// function definition

int fun(int (*p)[][3])

{

int i,j,sum=0;

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

sum=sum+(*p)[i][j];

}

}

return sum;

}