Is there a way to code this? Im trying to code something that will display Monday Tuesday, wednesday and etc

Question

Hello beginner coder here is there anyway to print the week days without doing it like this

#include <stdio.h>
int main()
{
    int nDay;
    if (nDay == 1)
        printf("Sunday");
    else if (nDay == 2)
        printf("Monday"); // and so on
    return 0;
}

this way might be lengthy if I code till the 42th day, is there anyway to code this? i tried using modulos but it doesn't work like I wanted it to be.

Answer 1

You can use arrays.

#include <stdio.h>

// a list of strings to print
static const char* days[] = {
    "", // a dummy element to put the elements in light places
    "Sunday",
    "Monday",
    // and so on
};

int main()
{
    int nDay;

    // assign something to nDay
    nDay = 1; // for example

    // if the string to print is defined for the value of nDay
    if (0 < nDay && nDay < (int)(sizeof(days) / sizeof(*days)))
    {
        // print the string
        fputs(days[nDay], stdout);
    }

    return 0;
}

Answer 2

The standard library function strftime can do this for you:

#include <stdio.h>
#include <string.h>
#include <time.h>

void print_weekday(int wday)
{
    struct tm tm;
    memset(&tm, 0, sizeof tm);
    tm.tm_wday = wday;

    char obuf[80];
    strftime(obuf, sizeof obuf, "%A", &tm);
    puts(obuf);
}

Error handling, more sensible sizing of obuf, etc. left as an exercise.

Answer 3

What you can do is pre-compute all values and store it.And then use it later as per your needs. Check this code.

#include<bits/stdc++.h>
using namespace std;

int main()
{
    unordered_map<int,string>mp;
    mp[1]="Sunday";
    mp[2]="Mon";
    mp[3]="Tue";
    mp[4]="Wed";
    mp[5]="Thu";
    mp[6]="Fri";
    mp[7]="Sat";
    int n;
    cin>>n;
    cout<<mp[n%7]<<endl;
    
}