程序代码：

#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
string add(string a, string b)
{
    int i=a.length (), j=0, k=b.length ();
    string c="";
    while (i || j || k)
    {
        if (i)
        {
            j = j + a[i - 1] - '0';
            i--;
        }
        if (k)
        {
            j = j + b[k - 1] - '0';
            k--;
        }
        c = (char)(j % 10 + '0') + c;
        j /= 10;
    }
    return c;
}
string mult(string a, int b)
{
    int i, j=0;
    string c="";
    for (i = a.length(); i; i--)
    {
        j = b * (a[i - 1] - '0') + j;
        c = (char)(j % 10 + '0')+c;
        j /= 10;
    }
    if (j)c = char(j + '0') + c;
    return c;
}
int main()
{
    string a, b, c, d;
    int i, j, l;
    cin >> a >> b;
    l = a.length() + b.length() + 1;
    cout << setw(l) << a << endl << "*" << setw(l -  1) << b << endl;
    for (i = 0; i < l; i++)cout << "-";
    cout << endl;
    for (i = b.length(); i; i--)
    { 
        d = mult(a, (int)(b[i - 1] - '0'));
        cout << setw(l + i - b.length()) << d << endl;
        for (j = 0; j < b.length() - i; j++)d = d + '0';
        c = add(c, d);
    }
    for (i = 0; i < l; i++)cout << "-";
    cout << endl << setw(l) << c << endl;
    return 0;
}

程序代码：

#include <iostream>
#include<iomanip>
using namespace std;
int main()
{
    int a, b;
    cout <<"请输入一个数回车后再输入一个数:\n";
    cin >> a >> b;
    system("cls");
      cout <<a<<"+"<<b<<"的竖式计算过程如下:\n\n";
      
      std::cout << setw(10)<<a<<"\n";
      cout << setw(2 )<< "+" << setw(8) << b<<endl;
      cout << "-----------\n";
          cout << setw(10) << a + b;
          while (true)
          {
              ;
          }
    return 0;
}