#include<assert.h>无法编译？

#include<stdio.h>
#include<assert.h>
int joseph(int k){
    int m,t,a=1,b,i,n;
    while(1){
        for(b=1;b<=k;b++){
            m=a*k+b,t=0,n=2*k;
            for(i=1;i<=k;i++){
                t=(t+m-1)%n;
                if(t<k)
                    break;
                n--;
            }
            if(i>k)
                return m;
        }
        a+=2;
    }
}
int main(){
    int k;
    FILE *f1=fopen("chap01/Joseph/inputdata.txt","r"),
        *f2=fopen("chap01/Joseph/outputdata.txt","w");
    assert(f1&&f2);
    fscanf(f1,"%d",&k);
    while(k){
        fprintf(f2,"%d\n",joseph(k));
        fscanf(f1,"%d",&k);
    }
    fclose(f1);fclose(f2);
    return 0;
}