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http://www.cnblogs.com/hoodlum1980/archive/2007/08/15/857067.html
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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define N 100
void GetDigits(int *a,char *s);
void multiply(int *a,int *b,int *c);
main()
{
char s1[N],s2[N];
int i,j,a[N],b[N],c[N*2];
printf("\n input number a: ");
scanf("%s",s1);
printf("\n input number b: ");
scanf("%s",s2);
//°ÑÊäÈëµÄ×Ö·û´®£¬°´Î»´æ·Åµ½Êý×é
GetDigits(a,s1);
GetDigits(b,s2);
multiply(a,b,c);
//ÕÒµ½×î¸ßλ
j=N*2-1;
while(c[j]==0)
j--;
//´òÓ¡¼ÆËã½á¹û
printf("\n %s * %s=",s1,s2);
for(i=j;i>=0;i--)
printf("%d",c[i]);
}
/*°Ñ×Ö·û´®ÐÎʽµÄÊý×Ö°´Î»´æ·Åµ½Êý×é*/
void GetDigits(int *a, char *s)
{
int i;
char digit;
int len=strlen(s);
for(i=0;i<N;i++)
*(a+i)=0;
for(i=0;i<len;i++)
{
digit=*(s+i);
*(a+len-1-i) = digit - '0';
}
}
/*°Ña*bµÄ½á¹û´æ´¢µ½Êý×écÖУ¬°´Î»±íʾ*/
void multiply(int *a,int *b,int *c)
{
int i,j;
//ÏȰѽá¹ûÊý×éÉèÖÃÎ
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