Straight insertion sort

is.c

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

void sort(int *a, int n) {
  for (int i = 1; i < n; ++i) {
    int j, t = a[i];
    for (j = i; j > 0 && a[j - 1] > t; --j) a[j] = a[j - 1];
    a[j] = t;
  }
}

int main(void) {
  int n = 30, a[n];
  for (int i = 0; i < n; ++i) a[i] = rand();
  sort(a, n);
  for (int i = 0; i < n; ++i) printf("%d\n", a[i]);
  return 0;
}