Tutorial — ejercicio-archivo

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Learn by programming: follow each step, write your own code, then apply it to the course assignment.

What you will build

Read a text file and write another with uppercase content.

Steps in this tutorial

1. 1. Open input file
2. 2. Convert to uppercase
3. 3. Write output file
4. 4. Test with sample file

1. 1

   Open input file

   Use `std::ifstream` and verify the file exists before reading.

   
   								std::ifstream in("entrada.txt");
   if (!in) {
       std::cerr << "No se pudo abrir entrada.txt\n";
       return 1;
   }
   							

   I completed this step
2. 2

   Convert to uppercase

   You can use `` `toupper` per character or `` algorithms.
   I completed this step
3. 3

   Write output file

   `std::ofstream` with a different name (e.g. `salida.txt`). Close streams when done.
   I completed this step
4. 4

   Test with sample file

   Create `entrada.txt` with lowercase and verify `salida.txt`.
   I completed this step

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