Mega Code Archive
A Quicksort for strings
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#include <stdio.h>
#include <string.h>
void quickSortMain(char items[][10], int count);
void quickSort(char items[][10], int left, int right);
int main(void)
{
int i;
char str[][10] = { "this","is","a","test"};
quickSortMain(str, 4);
for(i=0; i<4; i++) {
printf("%s ", str[i]);
}
return 0;
}
void quickSortMain(char items[][10], int count)
{
quickSort(items, 0, count-1);
}
void quickSort(char items[][10], int left, int right)
{
int i, j;
char *x;
char temp[10];
i = left;
j = right;
x = items[(left+right)/2];
do {
while((strcmp(items[i],x) < 0) && (i < right)) {
i++;
}
while((strcmp(items[j],x) > 0) && (j > left)) {
j--;
}
if(i <= j) {
strcpy(temp, items[i]);
strcpy(items[i], items[j]);
strcpy(items[j], temp);
i++;
j--;
}
} while(i <= j);
if(left < j) {
quickSort(items, left, j);
}
if(i < right) {
quickSort(items, i, right);
}
}
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