帮忙看一下这个c++的问题出在哪里了

Question

void main(){char *BB1="efcdab89",BB[32]="aaaaa";cout<<BB<<endl;HextoBin(BB,BB1);cout<<BB<<endl;}void HextoBin(char deststr[],char srcstr[]){int k=0,w=0,i,a[8],total=0;char str[4]="",stra[32];for(i=0;i<8;i++){if(int(srcstr[i])>47&&int(srcstr[i])<58){a[i]=int(srcstr[i])-48;}else{a[i]=int(srcstr[i])-87;}itoa(a[i],str,2);cout<<str<<endl;char strb[5]="";for(i=1;i<=4-strlen(str);i++){strcat(strb,"0");}strcat(strb,str);strcat(stra,strb);}strcpy(deststr,stra);}

Answer 1

修改后的C++程序
#include<iostream>
using namespace std;
void HextoBin(char deststr[],char srcstr[]);
void main()
{
char *BB1="efcdab89",BB[32]="aaaaa";

cout<<BB<<endl;

HextoBin(BB,BB1);
cout<<BB<<endl;
}

void HextoBin(char deststr[],char srcstr[]){
int k=0,w=0,i,j,a[8],total=0;
char str[4]="",stra[32];

deststr[0]=0;
for(i=0;i<8;i++){
if(srcstr[i]>='0'&&srcstr[i]<='9'){
a[i]=srcstr[i]-'0';
}
else{
a[i]=srcstr[i]-'a'+10;
}
itoa(a[i],str,2);
cout<<"测试输出："<<str<<endl;
strcat(deststr,str);
}
}