C语言 · 大数乘法

 #include<stdio.h>
 #include<string.h>
 char s[];
 void mult(char a[],char b[])
 {
     int i,j,k=,alen,blen,sum=,res[][]={},flag=;
     char result[];
     alen=strlen(a);blen=strlen(b); 

     for (i=;i<alen;i++)
     for (j=;j<blen;j++) res[i][j]=(a[i]-'')*(b[j]-'');

     for (i=alen-;i>=;i--)
         {
             for (j=blen-;j>=;j--) sum=sum+res[i+blen-j-][j];
             result[k]=sum;
             k=k+;
             sum=sum/;
         }

     for (i=blen-;i>=;i--)
         {
             for (j=;j<=i;j++) sum=sum+res[i-j][j];
             result[k]=sum;
             k=k+;
             sum=sum/;
         }
     if (sum!=) {result[k]=sum;k=k+;}

     for (i=;i<k;i++) result[i]+='';
     for (i=k-;i>=;i--) s[i]=result[k--i];
     s[k]='\0';

     while()
         {
         if (strlen(s)!=strlen(a)&&s[]=='')
             strcpy(s,s+);
         else
             break;
         }
 }
 int main(){
     char str1[],str2[];
     int t,frag,i;
 //    while(scanf("%s%s",str1,str2)!=EOF){
     scanf("%s%s",str1,str2);
     mult(str1,str2);
     frag=;
     t=strlen(s);
     for(i=;i<t;i++){
         if(s[i]!='')
             frag=;
         if(frag==)
             printf("%c",s[i]);
     }
     if(frag==)
         printf("");
 //    }
     return ;
 }