基础练习

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
    int n;
    scanf("%d",&n);
    char *t = (char *)malloc(sizeof(char)*(n+1));
    memset(t,‘0‘,n);
    t[n] = ‘\0‘;
    for(int i=0;i<(1 << n);i++)//2^n次
    {
        puts(t);
        t[n-1] += 1;
        if(t[n-1] > ‘1‘)
        {
            for(int j=2;j<=n;j++)
            {
                t[n-j] += 1;
                t[n-j+1] =‘0‘;
                if(t[n-j] == ‘1‘)
                    break;
            }
        }
    }
    return 0;
}