一道C语言面试题——大数相乘的问题

#include "stdafx.h"
void Multiple(char A[], char B[], char C[])
{
int TMP, In=0, LenA=-1, LenB=-1;
while(A[++LenA] != '/0');
while(B[++LenB] != '/0');
int Index, Start = LenA + LenB - 1;
for(int i=LenB-1; i>=0; i--)
{
Index = Start--;
if(B[i] != '0')
{
for(int In=0, j=LenA-1; j>=0; j--)
{
TMP = (C[Index] - '0') + (A[j] - '0') * (B[i] - '0') + In;
C[Index--] = TMP % 10 + '0';
In = TMP / 10;
}
C[Index] = In + '0';
}
}
}
int main(int argc, char* argv[])
{
char A[] = "218392444444444444888888888800088888889";
char B[] = "388888888888999999999999945669999999988";
char C[sizeof(A) + sizeof(B) - 1];
for(int k=0; k<sizeof(C); k++)
C[k] = '0';
C[sizeof(C)-1] = '/0';
Multiple(A, B, C);
for(int i=0; C[i] != '/0'; i++)
printf("%c", C[i]);
return getchar();
}