triangle.c~

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Description: triangle.c  qustion4                                           *
 *                                                                             *
 * Written by Suiliang Qiu(Student ID=z3267009) for COMP9021                   *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <math.h>

bool check_digit(int*,int*);
int main(void)
{
    
    for(int k=15;k>0;k--)
        {
            int bits_lv1=0;
            bits_lv1+= 1<<k;
            for (int l=15;l>0;l--)/*lv2*/
                {
                    int bits_lv2=bits_lv1;
                    if(check_digit(&l,&bits_lv2))
                        continue;
                    int g=abs(k-l);
                    if(check_digit(&g,&bits_lv2))
                        continue;
                    for(int m=15;m>0;m--)/*lv3*/
                        {
                            int bits_lv3=bits_lv2;
                            if(check_digit(&m,&bits_lv3))
                                continue;
                            int h=abs(l-m);
                            if(check_digit(&h,&bits_lv3))
                                continue;
                            int d=abs(g-h);
                            if(check_digit(&d,&bits_lv3))
                                continue;
                            for(int n=15;n>0;n--)/*lv4*/
                                {
                                    int bits_lv4=bits_lv3;
                                    if(check_digit(&n,&bits_lv4))
                                        continue;
                                    int i=abs(m-n);
                                    if(check_digit(&i,&bits_lv4))
                                        continue;
                                    int e=abs(h-i);
                                    if(check_digit(&e,&bits_lv4))
                                        continue;
                                    int b=abs(d-e);
                                    if(check_digit(&b,&bits_lv4))
                                        continue;
                                    for(int o=15;o>0;o--)/*lv5*/
                                        {
                                            int bits_lv5=bits_lv4;
                                            if(check_digit(&o,&bits_lv5))
                                                continue;
                                            int j=abs(n-o);
                                            if(check_digit(&j,&bits_lv5))
                                                continue;
                                            int f=abs(i-j);
                                            if(check_digit(&f,&bits_lv5))
                                                continue;
                                            int c=abs(e-f);
                                            if(check_digit(&c,&bits_lv5))
                                                continue;
                                            int a=abs(b-c);
                                            if(check_digit(&a,&bits_lv5))
                                                continue;
                                            printf("             %d\n",a);
                                            printf("          %d    %d\n",b,c);
                                            printf("       %d    %d    %d\n",d,e,f);
                                            printf("    %d    %d    %d    %d\n",g,h,i,j);
                                            printf(" %d    %d    %d    %d    %d\n",k,l,m,n,o);
                                        }
                                }
                        }
                }
        }
}



bool check_digit(int* x,int* digit)
{
    if((*digit >>*x) % 2 == 0)
        {
            *digit += 1<<*x;
            return false;
        }
    else
        return true;
}