#include <stdio.h>
#include <string.h>

int main(int argc, char *argv[])
{
	long b,c,d;
	int i,i1,i2,j,k,n,n1,n2,a[256];
	char s1[256],s2[256];
	printf("enter number1:");
	scanf("%s",&s1);
	printf("enter number2:");
	scanf("%s",&s2);
	for(i=0;i<255;i++)
		a[i]=0;
	n1=strlen(s1);
	n2=strlen(s2);
	d=0;
	for(i1=0,k=n1-1;i1<n1;i1++,k--)
	{
		for(i2=0,j=n2-1;i2<n2;i2++,j--)
		{
			i=i1+i2;
			b=a[i]+(s1[k]-48)*(s2[j]-48)+d;
			a[i]=b%10;
			d=b/10;
		}
		while(d>0)
		{
			i++;
			a[i]=a[i]+d%10;d=d/10;
		}
		n=i;
	}
	printf("num1 * num2 = ");
	for(i=n;i>=0;i--)
		printf("%d",a[i]);
	printf("\n");
	return 0;
}