Answer to the Indentation Self-Test

Obviously, there are problems with that program other than the indentation. If you want to learn how to fix the other problems and learn what the program does, visit the Developing Good Programming Style page. Indentation is just one part of good style.

Your answer is probably not going to look exactly like mine; not to worry. If you made similar decisions, then your answer is probably just fine.

Here is my solution: 
#include <stdio.h>

void count(int, int, int, int, int*);

int main(void) 
{
        int d1, d2, d3, d4, m=0;

        for (d1=0; d1<2; d1++)
                for (d2=0; d2<10; d2++)
                        for (d3=0; d3<6; d3++)
                                for (d4=0; d4<10; d4++)
                                        count(d1,d2,d3,d4,&m);

        return 0;
}

void count (int d1, int d2, int d3, int d4, int *m)
{
        int seg[10] = {6,2,5,5,4,5,6,3,7,6};
        int ts,td;

        if ((!((d1==0)&&(d2==0))) && (!((d1==1)&&(d2>2)))) 
        {
                if (d1==0) 
                {
                        ts = seg[d2] + seg[d3] + seg[d4];
                        td = d2 + d3 + d4;
                        if (ts == td) 
                        {
                                (*m)++;
                                printf(" %1d:%1d%1d\n",d2,d3,d4);
                        }
                } 
                else 
                {
                        ts = seg[d1] + seg[d2] + seg[d3] + seg[d4];
                        td = d1 + d2 + d3 + d4;
                        if (ts == td)
                        { 
                                (*m)++;
                                printf("%1d%1d:%1d%1d\n",d1,d2,d3,d4);
                        }
                } 
        }
}

Answers to some common questions: