Selection Sort 정렬이 제대로 안되네요..

#include	<stdio.h>

#define	MAX 100

int swap(int *, int *);
int sort(int [], int);

int main(void){
	int index, n;
	int data[MAX];
	
	printf("Enter the n: ");
	scanf("%d", &n);
	
	if(n < 1 || n > MAX){
		fprintf(stderr, "Input error\n");
		exit(1);
	}

	for(index = 0; index < n; index++){
		data[index] = rand() % 100;
		printf("%d ", data[index]);
	}

	printf("Created data:\n");

	if(sort(data, n) != 0){
		fprintf(stderr, "Sort error!\n");
	}

	printf("Selection sorted data:\n");

	for(index = 0; index < n; index++){
		printf("%d ", data[index]);
	}
	
	printf("End\n");
}

int swap(int *x, int *y){
	int tmp = *x;
	*x = *y;
	*y = tmp;

	return 0;
}

int sort(int sdata[], int sn){
	int index1, index2, min;
	for(index1 = 0; index1 < sn - 1; index1++){
		min = index1;
		for(index2 = index1 + 1; index2 < sn; index2++){
			if(sdata[min] > sdata[index2]){
				min = index2;
			}
		}
		if(swap(&sdata[min], &sdata[index2]) != 0){
			fprintf(stderr, "Swap error!\n");
		}
		
	}
	
	return 0;
}