NFL足球比分的正确组合将不会打印奇数

Question

我创建了一个程序，从美式足球得分，并产生所有可能的方法来获得美式足球的得分。我刚刚创建了一个无转换的触地得分方法（将得分值递减6），该方法结合了一个字段目标方法（将值递减3）和一个安全性（将值递减2）。问题是，当键入偶数值时，没有包含达阵，字段目标和安全性的适当组合。该程序适用于奇数值。我怀疑问题可能是 fieldgoalsnumbersprinted 返回其String值。

static int sixtouchdownnumbers(int c) //return type doesn't matter
{
    int touchdowns6 = c;
    int touch6counter = 0;
    int touch6divided = touchdowns6/6;
    int lesserdowns6 = touch6divided -1;
    String booth;
    String box;
    String scoreboard;
    String boothbox;
    String seat; 
    String boothboxseat;
    if(touchdowns6 < 6)
    {

    return touchdowns6; //this value doesn't matter. I just have this here so the method stops if the score is less than 6.
    }

    touchdowns6 = c;
    touch6counter = 0;
    for(int i = 0; i <= lesserdowns6; i++)
    {
        touchdowns6 = touchdowns6-6;
        touch6counter++;

        booth = "there were " + touch6counter + " touchdowns without conversion";
        box = Safetynumbersprinted(touchdowns6); 
        seat = Fieldgoalnumbersprinted(touchdowns6);
        boothbox = booth+box;
        boothboxseat = boothbox+seat;
        if(boothboxseat.contains("safeties")) //fixes an issue with field goal loop generating bad scores.
        System.out.println(boothboxseat);
    }

    return 0;
}
static String Fieldgoalnumbersprinted(int d) 
{
    int fieldgoals = d;
    int goalcounter = 0;
    int fielddivided = fieldgoals/3;
    int lessergoals = fielddivided -1;
    String scoreb;
    String oard;
    String scoreboard;
    String nosebleed = "Error"; //if this is printed, the for loop didn't assign the right value.
    if(fieldgoals < 3)
    {
    return "";  
    }

    fieldgoals = d;
    goalcounter = 0;
    for(int i = 0; i <= lessergoals; i++)
    {
        fieldgoals = fieldgoals-3;
        goalcounter++;

        scoreb = ", " + goalcounter + " field goals";
        oard = Safetynumbersprinted(fieldgoals);
        scoreboard = scoreb+oard;
        if(scoreboard.contains("safeties")) //fixes an issue with field goal loop generating bad scores.
        nosebleed = scoreboard; //potential cause of the problem.
    }

    return nosebleed; 
}

    static String Safetynumbersprinted(int a) 
{                                       
    int safeties = a;
    int safetycounter = 0;
    int safedivided;
    String scorehalf;

    if ( (a & 1) == 0 ) //only even scores can be reduced to zero.
    { 
        safedivided = a/2;
        for(int i = 0; i < safedivided; i++)
        {
        safeties = safeties-2;  
        safetycounter++;
        }
        scorehalf = " and " + safetycounter + " safeties: ";
        return scorehalf; 
        }
    else 

    { 
    return "";
        }   
}