{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "value1: yang\n",
      "value2: yang\n",
      "value3: yangyang\n",
      "*ptr: yang\n"
     ]
    }
   ],
   "source": [
    "#include <stdio.h>\n",
    "\n",
    "int main()\n",
    "{\n",
    "    char value1[ ] = \"yang\";\n",
    "    char value2[5] = \"yang\";\n",
    "    char value3[4] = \"yang\";\n",
    "    \n",
    "    char *ptr = \"yang\";\n",
    "    \n",
    "    printf(\"value1: %s\\n\", value1);\n",
    "    printf(\"value2: %s\\n\", value2);\n",
    "    printf(\"value3: %s\\n\", value3);\n",
    "    printf(\"*ptr: %s\\n\", ptr);\n",
    "    \n",
    "    return 0;\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "// 다음 코드의 오류 원인은?\n",
    "\n",
    "#include <stdio.h>\n",
    "\n",
    "int main()\n",
    "{\n",
    "    int *ptr = NULL, i = 0, sum = 0;\n",
    "    \n",
    "    scanf(\"%d\", &ptr);\n",
    "    printf(\"%d\\n\", value);\n",
    "    \n",
    "    return 0;\n",
    "}\n",
    "\n",
    "/* \n",
    "  int value;\n",
    "  ptr = &value;\n",
    "  scanf(\"%d\", &*ptr);\n",
    "*/"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "ptr1 = 0x7ffeed5051cc\n",
      "ptr1 + 3 = 0x7ffeed5051d8\n",
      "ptr2 = 0x7ffeed5051d0\n",
      "++ptr2 = 0x7ffeed5051d4\n",
      "ptr3 = 0x7ffeed5051d4\n",
      "--ptr3 = 0x7ffeed5051d0\n"
     ]
    }
   ],
   "source": [
    "#include <stdio.h>\n",
    "\n",
    "int main()\n",
    "{\n",
    "    unsigned int array[3] = {10, 20, 30};\n",
    "    unsigned int *ptr1, *ptr2, *ptr3;\n",
    "    \n",
    "    ptr1 = &array[0];\n",
    "    ptr2 = &array[1];\n",
    "    ptr3 = &array[2];\n",
    "    \n",
    "    printf(\"ptr1 = %p\\n\", ptr1);\n",
    "    ptr1 = ptr1 + 3;\n",
    "    printf(\"ptr1 + 3 = %p\\n\", ptr1);\n",
    "\n",
    "    printf(\"ptr2 = %p\\n\", ptr2);\n",
    "    ++ptr2;\n",
    "    printf(\"++ptr2 = %p\\n\", ptr2);\n",
    "\n",
    "    printf(\"ptr3 = %p\\n\", ptr3);\n",
    "    --ptr3;\n",
    "    printf(\"--ptr3 = %p\\n\", ptr3);\n",
    "    \n",
    "    return 0;\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "string:  Programming\t address: 0x10b882f8e\n",
      "string:   rogramming\t address: 0x10b882f8f\n",
      "string:    ogramming\t address: 0x10b882f90\n",
      "string:     gramming\t address: 0x10b882f91\n",
      "string:      ramming\t address: 0x10b882f92\n",
      "string:       amming\t address: 0x10b882f93\n",
      "string:        mming\t address: 0x10b882f94\n",
      "string:         ming\t address: 0x10b882f95\n",
      "string:          ing\t address: 0x10b882f96\n",
      "string:           ng\t address: 0x10b882f97\n",
      "string:            g\t address: 0x10b882f98\n"
     ]
    }
   ],
   "source": [
    "#include <stdio.h>\n",
    "\n",
    "int main()\n",
    "{\n",
    "    char *ch = \"Programming\";\n",
    "    \n",
    "    while(*ch != '\\0')\n",
    "    {\n",
    "        printf(\"string: %12s\\t address: %10p\\n\", ch, ch);\n",
    "        ch++;\n",
    "    }\n",
    "    return 0;\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "  x = 5     y = 12\n",
      "*px = 5   *py = 12\n"
     ]
    }
   ],
   "source": [
    "#include <stdio.h>\n",
    "\n",
    "int main()\n",
    "{\n",
    "    int x, y;\n",
    "    int *ptr1, *ptr2;\n",
    "    \n",
    "    x = 5;\n",
    "    ptr1 = &x;\n",
    "    \n",
    "    y = *ptr1/2 + 10;\n",
    "    ptr2 = &y;\n",
    "    \n",
    "    printf(\"  x = %d     y = %d\\n\", x, y);\n",
    "    printf(\"*px = %d   *py = %d\\n\", *ptr1, *ptr2);\n",
    "    \n",
    "    return 0;\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "C",
   "language": "c",
   "name": "c"
  },
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   "file_extension": ".c",
   "mimetype": "text/plain",
   "name": "c"
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 },
 "nbformat": 4,
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}