[practice-0] add source code

.clangd

@@ -0,0 +1,2 @@
+CompileFlags:
+    Add: [-std=c23]

practice-1/main.c

@@ -0,0 +1,83 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+struct my_perfect_float
+{
+  unsigned char sign;
+  signed char exponent;
+  unsigned char dop_var;
+  int mantissa;
+};
+
+// 1. вернуть объект с некорректными данными в нём
+// 2. dm + error_code
+// 3. dm_e
+// 4. error_code as arg
+// 5. global vars
+
+int error_code;
+
+const int MANTISSA_SIZE = 24;
+
+struct dm_e
+{
+  struct dm result;
+  int error_code;
+};
+
+struct dm
+{
+  int32_t div;
+  int32_t mod;
+};
+
+
+int divmod(int32_t x, int32_t y, struct dm* dm)
+{
+  int aa = 2; // initialization
+  aa = 3; // assignment
+  int bb; // non-initialize
+  if (y == 0)
+  {
+    return 1;
+  }
+  *dm = (struct dm){ .div = x / y, .mod = x % y };
+  return 0;
+}
+
+// x, y => /, %
+struct dm divmod(int32_t x, int32_t y, int *error_code)
+{
+  int aa = 2; // initialization
+  aa = 3; // assignment
+  int bb; // non-initialize
+  if (y == 0)
+  {
+    *error_code = 1;
+    return (struct dm) { .div = 0, .mod = 0 };
+  }
+  //struct dm dm = { .div = x / y, .mod = x % y };
+  //return dm;
+  return (struct dm){ .div = x / y, .mod = x % y }; // compound literal
+}
+
+int main(int argc, char* argv[])
+{
+  if (argc != 4)
+  {
+    // free resourses
+    fprintf(stderr, "Usage: %s A.B <rounding> <number>\n", argv[0]);
+    return 1;
+  }
+
+  int32_t a, b;
+
+  int sz = 5;
+  // .... 100 lines
+  int64_t c;
+
+  c = 2;
+
+  return 0;
+}