两个大数相乘

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

void multiply(char* a,char* b,char* c)
{
??? int i,j,ca,cb,* s;
??? ca=strlen(a);
??? cb=strlen(b);
??? s=(int*)malloc(sizeof(int)*(ca+cb));
??? for (i=0;i<ca+cb;i++)
??????? s[i]=0;
??? for (i=0;i<ca;i++)
??????? for (j=0;j<cb;j++)
??????????? s[i+j+1]+=(a[i]-'0')*(b[j]-'0');
??? for (i=ca+cb-1;i>=0;i--)
??????? if (s[i]>=10)
??????? {
??????????? s[i-1]+=s[i]/10;
??????????? s[i]%=10;
??????? }
??? i=0;
??? while (s[i]==0)
??????? i++;
?????? for (j=0;i<ca+cb;i++,j++)
?????????? c[j]=s[i]+'0';
??? c[j]='';??? free(s);}