81 lines
1.4 KiB
Text
81 lines
1.4 KiB
Text
/* Overall test of arrays, loops, etc. that does a simple quicksort */
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class Record {
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int a;
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void print() {
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write(a);
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writeln();
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}
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}
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class Main {
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Record [] a;
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int i;
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void swap(Record r1, Record r2) {
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int temp;
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temp = r1.a;
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r1.a = r2.a;
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r2.a = temp;
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}
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void sort(int left, int right) {
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int i,j;
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int m;
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m = (a[left].a + a[right].a) / 2;
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i = left;
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j = right;
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while (i <= j) {
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while (a[i].a < m) { i = i+1; }
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while (a[j].a > m) { j = j-1; }
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if (i <= j) {
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swap(a[i], a[j]);
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i = i + 1;
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j = j - 1;
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}
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}
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if (left < j) { sort(left, j); }
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if (i < right) { sort(i, right); }
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}
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void main() {
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int SIZE;
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int j;
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SIZE = 5;
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a = new Record[SIZE];
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j = 0;
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while (j < SIZE) {
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a[j] = new Record();
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j = j + 1;
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}
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a[0].a = 5;
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a[1].a = 3;
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a[2].a = 1;
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a[3].a = 4;
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a[4].a = 2;
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/* Numbers before sorting */
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j = 0;
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while (j < SIZE) {
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a[j].print();
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j = j + 1;
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}
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writeln();
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sort(0, 4);
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/* Numbers after sorting */
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j = 0;
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while (j < SIZE) {
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a[j].print();
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j = j + 1;
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}
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writeln();
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}
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}
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