Go: package main

import (
        "fmt"
)

func main() {
        var weeks = []string{"Thursday",
                "Friday",
                "Saturday",
                "Sunday",
                "Monday",
                "Tuesday",
                "Wednesday"}

        for {
                var m, d int
                _, err := fmt.Scanf("%d %d", &m, &d)
                if err != nil || m + d == 0 {
                        break
                }
                var days int

                for {
                        lm, ld := getLastDay(m, d)
                        if lm + ld == 0 {
                                break
                        }
                        days++
                        m = lm
                        d = ld
                }
                fmt.Println(weeks[days%7])
        }
}

func getLastDay(m int, d int) (lm int, ld int) {
        if m == 1 && d == 1 {
                return 0, 0
        }

        if d > 1 {
                return m, d-1
        } else {
                if m == 3 {
                        return m-1, 29
                }
                if m == 3 || m == 5 || m == 7 || m == 10 || m == 12 {
                        return m-1, 30
                } else {
                        return m-1, 31
                }
        }
}

C++: //What day is today?
#include<bits/stdc++.h>
using namespace std;

int md[12]={31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

int main(){
  int m, d;
  while(cin >> m >> d){
    int sumd=0;
    if(m==0)break;
    for(int i=0; i<m-1; i++){
      sumd+=md[i];
    }
    sumd+=d;
    switch(sumd%7){
    case 1 : cout << "Thursday" << endl; break;
    case 2 : cout << "Friday" << endl; break;
    case 3 : cout << "Saturday" << endl; break;
    case 4 : cout << "Sunday" << endl; break;
    case 5 : cout << "Monday" << endl; break;
    case 6 : cout << "Tuesday" << endl; break;
    case 0 : cout << "Wednesday" << endl; break;
    }
  }
  return 0;
}

C++: #include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int day[12] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
string date[7] = {
    "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"
};

int main() {
    int m, d;
    while (cin >> m >> d, m && d) {
        int t = d + accumulate(day, day + m - 1, 0);
        cout << date[(t + 2) % 7] << endl;
    }
    return 0;
}

C++: #include <iostream>
#include <vector>
#include <string>

int main()
{
	std::vector<std::string> day_of_week{
		"Thursday",
		"Friday",
		"Suterday",
		"Sunday",
		"Monday",
		"Tuesday",
		"Wednesday"
	};

	std::vector<int> day_num_of_month{
		31,
		29,
		31,
		30,
		31,
		30,
		31,
		31,
		30,
		31,
		30,
		31
	};

	int month = 0;
	int day = 0;

	while (std::cin >> month >> day)
	{
		if (0 == month) { break; }

		int days_elapsed = 0;
		for (int m = 1; m < month; ++m)
		{
			days_elapsed += day_num_of_month[m - 1];
		}
		days_elapsed += day;

		std::cout << day_of_week[(days_elapsed - 1) % 7] << std::endl;
	}

	return 0;
}

C++: #include <iostream>
#include <algorithm>
using namespace std;

int main()
{
	while(1)
	{
		int h=20,y=4,m,d,W,ans;
		char *youbi[7]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
		cin>>m>>d;
		if(m==0)break;
		if(m<3)
		{
			y--;
			m+=12;
		}
		W=(y+y/4-y/100+y/400+(13*m+8)/5+d)%7;
		cout<<youbi[W]<<endl;
	}
	return 0;
}

C++: #include<stdio.h>

int Zeller(int,int,int);

int main(void){
  int i,j,sum,a,b;
  
  while(1){
    sum=0;
    scanf("%d %d",&a,&b);
    if(a==0 && b==0)break;

    switch(Zeller(2004,a,b)){
    case 0:
      printf("Sunday\n");
      break;
    case 1:
      printf("Monday\n");
      break;
    case 2:
      printf("Tuesday\n");
      break;
    case 3:
      printf("Wednesday\n");
      break;
    case 4:
      printf("Thursday\n");
      break;
    case 5:
      printf("Friday\n");
      break;
    case 6:
      printf("Saturday\n");
      break;
    }
  }
  return 0;
}

int Zeller(int year, int month, int day){
    if (month<3) {
        year--;
        month += 12;
    }
    return (year + year/4 - year/100 + year/400
            + (13*month+8)/5 + day) % 7;
}

C++: #include <iostream>
#include <string>
#include <vector>

using namespace std;
string a[7] = {
  "Monday",
  "Tuesday",
  "Wednesday",
  "Thursday",
  "Friday",
  "Saturday",
  "Sunday"};
int main(void){
  int aa,b;
  int mon[12] = {31,29,
		 31,30,
		 31,30,
		 31,31,
		 30,31,
		 30,31};
  while(cin>>aa>>b,aa+b){
    int d = b;
    for(int i = 0 ; i < aa-1 ; i ++){
      d += mon[i];
      //cout<<d<<endl;
    }
    
    cout<<a[(d+2)%7]<<endl;
  }
  //*/
}

C++: #include<iostream>
#include<cstdio>

using namespace std;

int Month;
int Day;

const char *data[7] ={
  "Monday",
  "Tuesday",
  "Wednesday",
  "Thursday",
  "Friday",
  "Saturaday",
  "Sunday"
};
const int days[12] = {31,29,31,30,31,30,31,31,30,31,30,31};

int ans[12][31];
int main(int argc, char *argv[])
{
  while(scanf("%d %d",&Month,&Day)){
      int d = 3;
    if(Month == 0)
      break;
    for(int i = 0;i < 12;i++){
      for(int j = 0;j < days[i];j++){
	ans[i][j] = d%7;
	d++;
      }
    }
    cout <<data[ans[Month-1][Day-1]]<<endl;
  }
  return 0;
}

C++: #include <iostream>
#include <sstream>
#include <string>
#include <vector>
#include <deque>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <bitset>
#include <algorithm>
#include <numeric>
#include <complex>
#include <functional>
#include <utility>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <climits>
#include <cctype>

using namespace std;

#define dump(n) cout<<"# "<<#n<<"="<<(n)<<endl
#define debug(n) cout<<__FILE__<<","<<__LINE__<<": #"<<#n<<"="<<(n)<<endl
#define repi(i,a,b) for(int i=int(a);i<int(b);i++)
#define rep(i,n) repi(i,0,n)
#define iter(c) __typeof((c).begin())
#define tr(c,i) for(iter(c) i=(c).begin();i!=(c).end();i++)
#define allof(c) (c).begin(),(c).end()
#define mp make_pair

typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<string> vs;
typedef pair<int,int> pii;

int fairfield(int y,int m,int d)
{
	if(m<=2){
		y--;
		m+=12;
	}
	return 365*y+y/4-y/100+y/400+153*(m+1)/5+d-428;
}

int main()
{
	string weekday[7]={"Sunday","Monday","Tuesday","Wednesday","Thursday", "Friday", "Saturday"};
	for(int m,d;cin>>m>>d,m|d;)
		cout<<weekday[fairfield(2004,m,d)%7]<<endl;
	
	return 0;
}

C++: #include<iostream>
#include<string>
using namespace std;

int m,d;
int data[] = {31,29,31,30,31,30,31,31,30,31,30,31};
string day[] = {"Thursday","Friday","Saturday","Sunday","Monday","Tuesday","Wednesday"};

int main(){
	while(cin >> m >> d){
		if(m == 0) break;

		for(int i = 0; i < m - 1; i++){
			d+=data[i];
		}
		cout << day[(d-1)%7] << endl;
	}
}

C++: #include<iostream>
#include<string>
using namespace std;
const string day[] = {"Thurs", "Fri", "Satur", "Sun", "Mon", "Tues", "Wednes"};

int main(){
  int m, d;
  while(cin >> m >> d, m != 0 || d != 0) {
    int days = d - 1;
    for(int i = 1; i < m; i++) { 
    if(i == 1 || i == 3 || i == 5 || i == 7 || i == 8 || i == 10 || i == 12)  days += 31;
    else if(i == 4 || i == 6 || i == 9 || i == 11) days += 30;
    else days += 29;
    }
    cout << day[days % 7] << "day" << endl;
  }
  return 0;
}

C++: #include<stdio.h>

int main(void){
	int m,d,now;
	char da[7][15]={"Wednesday","Thursday","Friday","Saturday","Sunday","Monday","Tuesday"};
	for(;;){
		now=0;
		scanf("%d %d",&m,&d);
		if(!m||!d)break;
		for(int i=1;i<m;i++){
			now+= i==2 ? 29 : (i<8 ? 30+i%2 : 31-i%2);
		}
		now+=d;
		printf("now= %d\n",now);
		printf("%s\n",&da[now%7]);
	}
	return 0;
}