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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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Excel writing and reading with pure c API

Reading and Writing Excel file with pure C api in windows system. tested on windows 2000, hope it can help you:
#ifndef _WINXLS_H_
#define _WINXLS_H_
/*============================================================================*
*      Include Files
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ECLIPSE ¿ª·¢ C/C++ ¹¤³Ì

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1¡¢°²×°JDKºÍEclipse
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