用C++帮我分析一下这道题---**Question Stem (Implicit Problem Description based on Input/Output Formats):**
The problem requires processing input that defines the dimensions of a matrix and a character, then outputting a matrix constructed using that character based on specific rules implied by the example.
**Input Format:**
The first line contains three values separated by spaces: the number of rows `m` of the matrix, the number of columns `n` of the matrix, and the character `z` to be printed. Both `m` and `n` are less than 100 (m < 100, n < 100).
**Output Format:**
Output an `n × m` matrix.
*Note: Trailing spaces at the end of each line in the output do not affect the correctness of the answer.*
**Example Input 1:**
```
3 4 *
```
**Example Output 1:**
```
****
* *
****
```