> For the complete documentation index, see [llms.txt](https://42-guide.gitbook.io/42-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://42-guide.gitbook.io/42-guide/piscine-life/c00/ft_print_comb2.md). # ft\_print\_comb2 This exercise requires you to write a function `ft_print_comb2` that displays all unique combinations of two two-digit numbers (in the format `XX XX`) between `00` and `99`. The combinations should be listed in ascending order, and no repetition of numbers is allowed within a single combination. *** #### **Requirements:** 1. **Input:** None (the function takes no parameters). 2. **Output:** * Print all unique combinations of two two-digit numbers in ascending order. * Each combination should be separated by a comma and a space (`,` ). * The last combination should **not** be followed by a comma and space. 3. **Allowed Function:** Only `write` can be used for output. 4. **Return Type:** The function should not return anything (`void`). *** #### **Steps to Solve:** 1. **Initialize Numbers:** * Use two variables to represent the two two-digit numbers in the combination. * Start with the smallest possible combination: `00 01`. 2. **Nested Loops:** * Use nested loops to iterate through all possible combinations of two two-digit numbers. * Ensure that the second number is always greater than the first to avoid repetition within a combination. 3. **Print the Combinations:** * Use the `write` function to print each combination in the format `XX XX`. * Add a comma and space after each combination except the last one. 4. **Edge Case Handling:** * Ensure the last combination (`98 99`) is printed without a trailing comma and space. *** #### **Code Implementation:** ```c #include // For the write function void print_number(int n) { char c; if (n < 10) { c = n + 48; // Convert single-digit number to ASCII write(1, "0", 1); // Print leading zero write(1, &c, 1); // Print the digit } else { c = n / 10 + 48; // Convert tens digit to ASCII write(1, &c, 1); // Print the tens digit c = (n % 10) + 48; // Convert units digit to ASCII write(1, &c, 1); // Print the units digit } } void ft_print_comb2(void) { int col[2]; // Array to store the two numbers col[0] = 0; // Start with the smallest number while (col[0] <= 98) // First number can go up to 98 { col[1] = col[0] + 1; // Second number starts one above the first while (col[1] <= 99) // Second number can go up to 99 { print_number(col[0]); // Print the first number write(1, " ", 1); // Print a space print_number(col[1]); // Print the second number if (col[0] == 98 && col[1] == 99) { write(1, "", 1); // Print nothing for the last combination } else { write(1, ", ", 2); // Print a comma and space } col[1]++; // Increment the second number } col[0]++; // Increment the first number } } ``` *** #### **Explanation:** 1. **Initialization:** * The array `col[2]` is used to store the two two-digit numbers. * The first number (`col[0]`) starts at `0` and goes up to `98` because the last valid combination starts with `98` (`98 99`). 2. **Nested Loops:** * The outer loop iterates through the first number (`col[0]`). * The inner loop iterates through the second number (`col[1]`), starting one above the first number. 3. **Printing the Combinations:** * The `print_number` function is called to print each two-digit number. * If the combination is `98 99`, it prints without a trailing comma and space. * For all other combinations, it prints the combination followed by `,` . 4. **Edge Case Handling:** * The condition `if (col[0] == 98 && col[1] == 99)` ensures that the last combination (`98 99`) is printed without a trailing comma and space. *** #### **Example Output:** If you run the function, the output will look like this: ``` 00 01, 00 02, 00 03, ..., 00 99, 01 02, ..., 97 99, 98 99 ``` *** #### **Key Points:** * **Nested Loops:** The use of nested loops ensures that all combinations are generated in ascending order without repetition. * **Edge Case Handling:** The last combination is handled separately to avoid printing an unnecessary comma and space. * **Number Formatting:** The `print_number` function ensures that single-digit numbers are printed with a leading zero (e.g., `00`, `01`, etc.). *** #### **Testing the Function:** Here’s a simple `main.c` to test the `ft_print_comb2` function: cCopy ```c #include // Function prototype void ft_print_comb2(void); int main(void) { ft_print_comb2(); // Call the function to print combinations return 0; } ``` **Expected Output:** ``` 00 01, 00 02, 00 03, ..., 00 99, 01 02, ..., 97 99, 98 99 ``` *** #### **Conclusion:** This exercise builds on the previous one by introducing two-digit numbers and more complex formatting. 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