一个c语言程序需要大佬帮忙看下

#include<stdio.h> #include<string.h> int change(char a) { if(a<58) { return (a-48); } else { return (a-55); } } int change1()//16 zhuan 8 { char a[6]; scanf("%s",a); int b[24],k,i,j,sum=0,mark; k=strlen(a); for(j=0;j<k;j++)//16 zhuan 2 { int c; c=change(a[j]); for(i=j*4+3;i>=j*4;i--) { b[i]=c%2; c=c/2; } } mark=3-(k*4)%3; for(i=0;i<k*4;i=i+3)//2 zhuan 8 { if(mark==2) { i=i-2; sum=sum*10+b[i+2]; mark=mark-2; } else if(mark==1) { i=i-1; sum=sum*10+b[i+1]*2+b[i+2]; mark--; } else { sum=sum*10+b[i]*4+b[i+1]*2+b[i+2]; } } return (sum); } int main() { int n,i; scanf("%d",&n); int b[n]; for(i=0;i<n;i++) { b[i]=change1(); } for(i=0;i<n;i++) { printf("%d\n",b[i]); } return (0); }