trainings/Rust_2026/rust-bs-2026-09-14/exercises/rust-exercises/2_ownership_borrowing.ipynb

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 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Ownership"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "vscode": {
     "languageId": "rust"
    }
   },
   "outputs": [],
   "source": [
    "fn main() {\n",
    "    // Use as many approaches as you can to make it work\n",
    "    let x = String::from(\"Hello world\");\n",
    "    let y = x;\n",
    "    println!(\"{}, {}\", x, y);\n",
    "}\n",
    "\n",
    "main();"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "vscode": {
     "languageId": "rust"
    }
   },
   "outputs": [],
   "source": [
    "// Don't modify code in main!\n",
    "fn main() {\n",
    "    let s1 = String::from(\"Hello world\");\n",
    "    let s2 = take_ownership(s1);\n",
    "\n",
    "    println!(\"{}\", s2);\n",
    "}\n",
    "\n",
    "// Only modify the code below!\n",
    "fn take_ownership(s: String) {\n",
    "    println!(\"{}\", s);\n",
    "}\n",
    "\n",
    "main();"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "vscode": {
     "languageId": "rust"
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   "outputs": [],
   "source": [
    "fn main() {\n",
    "    let s = give_ownership();\n",
    "    println!(\"{}\", s);\n",
    "}\n",
    "\n",
    "// Only modify the code below!\n",
    "fn give_ownership() -> String {\n",
    "    let s = String::from(\"Hello world\");\n",
    "    // Convert String to Vec\n",
    "    let _s = s.into_bytes();\n",
    "    s\n",
    "}\n",
    "\n",
    "main();"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "vscode": {
     "languageId": "rust"
    }
   },
   "outputs": [],
   "source": [
    "// Fix the error without removing any code\n",
    "fn main() {\n",
    "    let s = String::from(\"Hello World\");\n",
    "\n",
    "    print_str(s);\n",
    "\n",
    "    println!(\"{}\", s);\n",
    "}\n",
    "\n",
    "fn print_str(s: String)  {\n",
    "    println!(\"{}\",s)\n",
    "}\n",
    "\n",
    "main();"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "vscode": {
     "languageId": "rust"
    }
   },
   "outputs": [],
   "source": [
    "// Don't use clone, use copy instead\n",
    "fn main() {\n",
    "    let x = (1, 2, (), \"hello\".to_string());\n",
    "    let y = x.clone();\n",
    "    println!(\"{:?}, {:?}\", x, y);\n",
    "}\n",
    "\n",
    "main();"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "vscode": {
     "languageId": "rust"
    }
   },
   "outputs": [],
   "source": [
    "// make the necessary variable mutable\n",
    "fn main() {\n",
    "    let s = String::from(\"Hello \");\n",
    "    \n",
    "    let s1 = s;\n",
    "\n",
    "    s1.push_str(\"World!\");\n",
    "\n",
    "    println!(\"Success!\");\n",
    "}\n",
    "\n",
    "main();"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Reference & Borrowing"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Reference"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "vscode": {
     "languageId": "rust"
    }
   },
   "outputs": [],
   "source": [
    "fn main() {\n",
    "    let x = 5;\n",
    "    \n",
    "    // Fill the blank\n",
    "    let p = __;\n",
    " \n",
    "    println!(\"the memory address of x is {:p}\", p); // One possible output: 0x16fa3ac84\n",
    " }\n",
    "\n",
    " main();"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "vscode": {
     "languageId": "rust"
    }
   },
   "outputs": [],
   "source": [
    "// Fix error\n",
    "fn main() {\n",
    "    let mut s = String::from(\"hello, \");\n",
    "\n",
    "    borrow_object(s);\n",
    "\n",
    "    println!(\"Success!\");\n",
    "}\n",
    "\n",
    "fn borrow_object(s: &String) {}\n",
    "\n",
    "main();"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "vscode": {
     "languageId": "rust"
    }
   },
   "outputs": [],
   "source": [
    "// Fix error\n",
    "fn main() {\n",
    "    let mut s = String::from(\"hello, \");\n",
    "\n",
    "    push_str(s);\n",
    "\n",
    "    println!(\"Success!\");\n",
    "}\n",
    "\n",
    "fn push_str(s: &mut String) {\n",
    "    s.push_str(\"world\")\n",
    "}\n",
    "\n",
    "main();"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Borrowing"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "vscode": {
     "languageId": "rust"
    }
   },
   "outputs": [],
   "source": [
    "// Remove something to make it work\n",
    "// Don't remove a whole line !\n",
    "fn main() {\n",
    "    let mut s = String::from(\"hello\");\n",
    "\n",
    "    let r1 = &mut s;\n",
    "    let r2 = &mut s;\n",
    "\n",
    "    println!(\"{}, {}\", r1, r2);\n",
    "\n",
    "    println!(\"Success!\");\n",
    "}\n",
    "\n",
    "main();"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "vscode": {
     "languageId": "rust"
    }
   },
   "outputs": [],
   "source": [
    "fn main() {\n",
    "    // Fix error by modifying this line\n",
    "    let s = String::from(\"hello, \");\n",
    "\n",
    "    borrow_object(&mut s);\n",
    "\n",
    "    println!(\"Success!\");\n",
    "}\n",
    "\n",
    "fn borrow_object(s: &mut String) {}\n",
    "\n",
    "main();"
   ]
  }
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