Walsh Matrix fixed power

This program is for implementing WALSH MATRIX . This is a part of Mumbai University MCA Colleges Data Communication and Networking MCA Sem 4

#include<stdio.h>

#include<conio.h>

void main()

{

int choice, *arr, i, order, size;

char ans;

do

{

clrscr();

printf("List of operations:\n");

printf("\n1. Walsh Matrix of order 1");

printf("\n2. Walsh Matrix of order 2");

printf("\n3. Walsh Matrix of order 4");

printf("\n0.Exit ");

printf("\n\nEnter your choice: ");

scanf("%d",&choice);

switch(choice)

{

case 1:

order = 1;

size = order*order;

arr[0] = 1;

arr[size]='\0';

break;

case 2:

order = 2;

size = order*order;

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

arr[i] = 1;

arr[3] = -1;

break;

case 3:

order = 4;

size = order*order;

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

arr[i] = 1;

arr[5] = -1;

arr[7] = -1;

arr[10] = -1;

arr[11] = -1;

arr[13] = -1;

arr[14] = -1;

break;

case 0:

exit();

break;

default:

printf("\nINVALID OPTION..\n\n");

}

printf("\n\nWalsh Matrix of order %d :\n\n",choice);

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

{

if(i%order == 0)

printf("\n");

printf("%3d",arr[i]);

}

getch();

}while(1);

arr[size]=0;

getch();

}

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