#include<stdio.h>
#include <conio.h>
#include<string.h>
#include<alloc.h>
char * mul(char *, char);
char * add(char *, char *);
void main()
{

	char *no1=(char * )malloc(100);
	char *no2=(char *)malloc(100);
	char *q="0";
	char *p;
	int i=0,j=0,t=0,l=0;
	clrscr();
	printf("\n Enter the large no ");
	gets(no1);
	printf("\n Enter the second no ");
	gets(no2);

	while(l<strlen(no2))
	{
		p=mul(no1,no2[l]);
		for(j=1;j<=strlen(no2)-l-1;j++)
		strcat(p,"0");
		q=add(q,p);
		l++;
	}
	printf("\n Multiplication is %s",q);
	free(no1);
	free(no2);
}


char * mul(char *x, char ch)
{
	int i=0,j=0,t=0;
	char *p=(char *)malloc(300);
	char *a =(char *)malloc(300);
	strcpy(p,x);
	strrev(p);
	while(p[i]!='\0')
	{
		a[j]=(p[i]-48)*(ch-48)+t;
		t=a[j]/10;
		a[j]=(a[j]%10)+48;
		i++;
		j++;
	}
	if(t!=0)
	a[j]=t+48;
	else
	j--;
	a[j+1]='\0';
	strrev(a);
	free(p);
	return(a);
}
char * add(char *p, char *q)
{
	char *t=(char *)malloc(300);
	int i=0,j=0,x=0,a;
	strrev(p);
	strrev(q);
	while(p[i]!='\0' && q[i]!='\0')
	{
		a=(p[i]-48)+(q[i]-48)+x;
		x=a/10;
		a=a%10;
		t[i]=a+48;
		i++;
	}
	while(i<strlen(p))
	{
		a=(p[i]-48)+x;
		x=a/10;
		a=a%10;
		t[i]=a+48;
		i++;
	}
	while(i<strlen(q))
	{
		a=(q[i]-48)+x;
		x=a/10;
		a=a%10;
		t[i]=a+48;
		i++;
	}

	if(x!=0)
		t[i++]=x+48;
	t[i]='\0';
	strrev(t);
	return(t);
}