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// 11函数功能：交换法实现字符串按字典顺序排序
void AsSortbyNum(STU stu[], int n, int m)
{
int i, j, k, t;
for (i=0; i<n-1; i++)
k = i;
for (j=i+1; j<n; j++)
if (stu[j].num < stu[k].num) k = j;
}
if (k != i)
for (t=0; t<m; t++)
SwapFloat(&stu[k].score[t], &stu[i].score[t]);
SwapFloat(&stu[k].sum, &stu[i].sum);
SwapFloat(&stu[k].aver, &stu[i].aver);
SwapLong(&stu[k].num, &stu[i].num);
SwapChar(stu[k].name, stu[i].name);
