cout << setw(3) << 23456 << '\n' << endl;

This code will output the number 23456 with a field width of 3, meaning that it will be padded with spaces to occupy 3 characters. The output will be:

23456

Note that the '\n' character adds a new line after the number is printed. The extra '\n' at the end of the line is redundant, as it also adds a new line.

相关问题

cout <<setw (3) << a << b << endl；

This code will output the values of variables "a" and "b" on the same line, with a minimum width of 3 characters for the first value (variable "a"). There will be no space between the values. The output will end with a newline character.

Note: The semicolon at the end of the statement is not correctly formatted and should be omitted. The corrected code is:

cout << setw(3) << a << b << endl;

void showStuInfo() { cout << left << setw(12) << stuNum; cout << left << setw(10) << stuName; cout << left << setw(6) << gender; cout << left << setw(23) << department; cout << left << setw(6) << classNum; //cout<< left << setw(20)<< selectclass; //cout << left << setw(6) << score << endl; }

这是一个 C++ 中的函数，用于输出学生信息。函数名为 showStuInfo，没有输入参数，返回值类型未知（可能为 void 或其他类型）。函数体内使用了 C++ 标准库中的 iostream 和 iomanip 头文件中的函数和类，其中包括了 left、setw 等控制输出格式的函数和类。函数体内依次输出了学号、姓名、性别、院系、班级等信息。在函数体内，还有两行被注释掉的代码，可能是输出选课信息和分数信息的代码，但被注释掉了，因此不会被执行。