冒泡排序不工作，如果语句不执行

Question

我正在编写一个程序，该程序将用于对学生的考试成绩进行排序，并最终检索分数的平均值、中位数和模式。由于一些奇怪的原因，我的冒泡排序不工作。我不知道为什么。

#include <stdio.h>
#include <stdlib.h> 
#include <string.h>
#define N 3
int main (void)
{
char vStudents[N][15], trans = 'y', vTemp2;
int vScores[N], vTemp, x, i = 0, j=0, NewN;
printf("ttWhatsamatta U Scores Systemnn");
do
{
    printf("Please Enter Students Name: ");
    gets(vStudents[i]);
    trans = 'N';
    while (trans == 'N')
    {
        printf("Enter Students Score: ");
        scanf("%d", &vScores[i]);
        fflush(stdin);
        if (vScores[i] >= 0 & vScores[i] <= 100)
            trans = 'y';
        else 
            printf("Score is invalid, please re-enter score.n");
    }
    i++;
    j++;
} while (j != N);

for(x = 0; x < N - 1; x++)
{   
    if ((x < N - 1) && (vScores[i] > vScores[i + 1]))
    {
        vTemp = vScores[i];
        vScores[i] = vScores[i + 1];
        vScores[i + 1] = vTemp;
        x = -1;
    }
}
printf("%d %d %dnn", vScores[0], vScores[1], vScores[2]);
system("Pause");
return 0;

任何帮助将是有用的，提前感谢!

Answer 1

至少有一个错误:

for(x = 0; x < vScores[N] - 1; x++)
{   
   if ((x < vScores[N] - 1) && (vScores[N] > vScores[N + 1]))
   {

应该

 for(x = 0; x <N - 1; x++)
 {   
    if ((x < N - 1) && (vScores[N] > vScores[N + 1]))
    {
     //^^you should not compare index x with array elements

Answer 2

N总是3。如果我们将代码中的N替换为3，它仍然有意义吗?

for(x = 0; x < vScores[3] - 1; x++)
{   
    if ((x < vScores[3] - 1) && (vScores[3] > vScores[3 + 1]))
    {
        vTemp = vScores[3];
        vScores[3] = vScores[3 + 1];
        vScores[3 + 1] = vTemp;
        x = -1;
    }
}

好的，现在是这样的:

for(x = 0; x < N - 1; x++)
{   
    if ((x < N - 1) && (vScores[i] > vScores[i + 1]))
    {
        vTemp = vScores[i];
        vScores[i] = vScores[i + 1];
        vScores[i + 1] = vTemp;
        x = -1;
    }
}

问，i何时改变?