File: main.c

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#include <assert.h>
#include <stdlib.h>

int main()
{
  char *a[] = {"   -9", "+0x42", "017", "0xa", "0xD"};

  assert(strtol(a[0], 0, 10) == -9);
  assert(strtol(a[1], 0, 0) == 66);
  assert(strtol(a[1], 0, 16) == 66);
  assert(strtol(a[2], 0, 0) == 15);
  assert(strtol(a[2], 0, 8) == 15);
  assert(strtol(a[3], 0, 0) == 10);
  assert(strtol(a[3], 0, 16) == 10);
  assert(strtol(a[4], 0, 0) == 13);
  assert(strtol(a[4], 0, 16) == 13);

  assert(strtol(a[2], 0, 32) == 39);
  assert(strtol(a[4], 0, 11) == 0);
  assert(strtol(a[4] + 2, 0, 11) == 0);
  assert(strtol(a[4] + 2, 0, 15) == 13);

  char *end = 0;
  (void)strtol(a[0], &end, 10);
  assert(end == a[0] + 5);

  assert(atoi(a[0]) == -9);
  assert(atol(a[0]) == -9);

  return 0;
}