bubble sort & selection sort

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>

void selectsort (int a[], int size) {
    int i, j, jmax;
    int max;

    printf("\ni: 0 ~> %d\n", size-1-1);
    for (i = 0; i < size - 1; i++) {
        printf("\ni = %d\n", i);
        max = a[0];
        jmax = 0;
        printf("max = %d, jmax = %d\n", max, jmax);
        printf("j: 1 ~> size-i-1 (%d)\n", size-i-1);
        for (j = 1; j< size - i; j++) {
            printf("j = %d\n", j);
            if (a[j] > max) {
                printf("a[%d] > max\n", j);
                max = a[j];
                jmax = j;
                printf("max = %d, jmax = %d\n", max, j);
            }
        }
        if (jmax != size - i - 1) {
            printf("jmax (%d) != size-i-1 (%d)\n", jmax, size-i-1);
            max = a[size - i - 1];
            a[size -i -1] = a[jmax];
            a[jmax] = max;
            printf("max = %d, a[%d] = %d, a[%d] = %d\n", max, size-i-1, a[size -i -1], jmax, a[jmax]);
        }
    }
}

void bubblesort (int a[], int size) {
    int i, j;
    int temp;

    printf("\ni: size-1 (%d) ~> 1\n", size-1);
    for (i = size - 1; i > 0; i--) {
        printf("i = %d\n", i);
        printf("\nj: 0 ~> i-1 (%d)\n", i-1);
        for (j = 0; j < i; j++) {
            if (a[j] > a[j+1]) {
                printf("a[%d]=%d > a[%d]=%d\n", j, a[j], j+1, a[j+1]);
                temp = a[j];
                a[j] = a[j+1];
                a[j+1] = temp;
                printf("a[%d] = %d, a[%d] = %d\n", j, a[j], j+1, a[j+1]);
            }
        }
    }
}

int main() {
    int x[10] = {45, 12, 3, 6, 98, 1, 56, 11, 87, 0};
    int size = 10;

    printf("Before:\n");
    for (int i = 0; i<size; i++) {
        printf("a[%d] ", i);
    }
    printf("\n");
    for (int i = 0; i<size; i++) {
        printf("%-4d ", x[i]);
    }
    printf("\n");

    /* bo comment 1 trong 2 phuong phap de tinh */
    //selectsort (x, size);
    //bubblesort (x, size);

    printf("\n\nAfter:\n");
    for (int i = 0; i<size; i++) {
        printf("a[%d] ", i);
    }
    printf("\n");
    for (int i = 0; i<size; i++) {
        printf("%-4d ", x[i]);
    }

    return (0);
}