C-Programm Tage zwischen zwei Datumsangaben

Ich habe ein Programm geschrieben, dass sollte finden die Tage zwischen zwei Daten, aber es hat einige Problemchen. Die Logik macht absolut Sinn in meinem Kopf, wenn ich Lesen es, also bin ich-vorausgesetzt ich habe einige syntax-Fehler, dass ich immer mit einem Blick über oder so etwas.

Erstens, bei der Eingabe von zwei Datumsangaben in verschiedenen Jahren, der Ausgang ist immer ausgeschaltet, indem über einen Monat (31 in den meisten Fällen, aber 32 in einem Fall...go figure). Zweite, zwei Termine genau einen Monat auseinander zurück, die Anzahl der Tage im zweiten Monat (z.B. 1/1/1 zu 2/1/1 Erträge 28). Gibt es zwangsläufig einige andere seltsame Dinge, dass dieses Programm funktioniert, aber ich hoffe, das ist genug Informationen, um Ihnen zu helfen Jungs herauszufinden, was ich falsch mache. Für das Leben von mir ich kann nicht herausfinden this one out auf meiner eigenen. Ich bin relativ neu in C, so bitte sanft sein =)

Dank

//Calculates the number of calendar days between any two dates in history (beginning with 1/1/1).

#include <stdio.h>
#include <stdlib.h>

void leap(int year1, int year2, int *leap1, int *leap2);
void date(int *month1, int *day1, int *year1, int *month2, int *day2, int *year2, int *leap1, int *leap2);

int main(void)
{
        int month1, day1, year1, month2, day2, year2, leap1, leap2;
        int daysPerMonth[] = {31,28,31,30,31,30,31,31,30,31,30,31};
        int daysPerMonthLeap[] = {31,29,31,30,31,30,31,31,30,31,30,31};

        leap(year1, year2, &leap1, &leap2);
        date(&month1, &day1, &year1, &month2, &day2, &year2, &leap1, &leap2);

        if(year1 == year2)
        {
                int i, total;

                if(month1 == month2)                            //Total days if month1 == month2
                {
                        total = day2 - day1;
                        printf("There are %d days between the two dates.", total);
                }
                else
                {
                    if(leap1 == 1)
                        total = daysPerMonthLeap[month1] - day1;
                    else
                        total = daysPerMonth[month1] - day1;

                    for(i = month1 + 1; i < month2; i++)        //Days remaining between dates (excluding last month)
                    {
                        if(leap1 == 1)
                            total += daysPerMonthLeap[i];
                        else
                            total += daysPerMonth[i];
                    }

                    total += day2;                              //Final sum of days between dates (including last month)

                    printf("There are %d days between the two dates.", total);
                }
        }
        else                                                    //If year1 != year2 ...
        {
                int i, total, century1 = ((year1 / 100) + 1) * 100, falseleap = 0;

                if(leap1 == 1)
                    total = daysPerMonthLeap[month1] - day1;
                else
                    total = daysPerMonth[month1] - day1;

                for(i = month1 + 1; i <= 12; i++)               //Day remaining in first year
                {
                    if(leap1 == 1)
                        total += daysPerMonthLeap[i];
                    else
                        total += daysPerMonth[i];
                }

                for(i = 1; i < month2; i++)                     //Days remaining in final year (excluding last month)
                {
                    if(leap2 == 1)
                        total += daysPerMonthLeap[i];
                    else
                        total += daysPerMonth[i];
                }

                int leapcount1 = year1 / 4;                     //Leap years prior to and including first year
                int leapcount2 = year2 / 4;                     //Leap years prior to and NOT including final year
                if(year2 % 4 == 0)
                        leapcount2 -= 1;

                int leaptotal = leapcount2 - leapcount1;        //Leap years between dates

                for(i = century1; i < year2; i += 100)          //"False" leap years (divisible by 100 but not 400)
                {
                        if((i % 400) != 0)
                                falseleap += 1;
                }

                total += 365 * (year2 - year1 - 1) + day2 + leaptotal - falseleap;      //Final calculation
                printf("There are %d days between the two dates.", total);
        }
        return 0;
}

void leap(int year1, int year2, int *leap1, int *leap2)             //Determines if first and final years are leap years
{
        if(year1 % 4 == 0)
        {
                if(year1 % 100 == 0)
                {
                        if(year1 % 400 == 0)
                                *leap1 = 1;
                        else
                                *leap1 = 0;
                }
                else
                        *leap1 = 1;
        }
        else
                *leap1 = 0;

        if(year2 % 4 == 0)
        {
                if(year2 % 100 == 0)
                {
                        if(year2 % 400 == 0)
                                *leap2 = 1;
                        else
                                *leap2 = 0;
                                }
                else
                        *leap2 = 1;
        }
        else
                *leap2 = 0;
}

void date(int *month1, int *day1, int *year1, int *month2, int *day2, int *year2, int *leap1, int *leap2)
{
        for(;;)                     //Infinite loop (exited upon valid input)
        {
                int fail = 0;
                printf("\nEnter first date: ");
                scanf("%d/%d/%d", month1, day1, year1);
                if(*month1 < 1 || *month1 > 12)
                {
                        printf("Invalid entry for month.\n");
                        fail += 1;
                }
                if(*day1 < 1 || *day1 > 31)
                {
                        printf("Invalid entry for day.\n");
                        fail += 1;
                }
                if(*year1 < 1)
                {
                        printf("Invalid entry for year.\n");
                        fail += 1;
                }
                if(daysPerMonth[month1] == 30 && *day1 > 30)
                {
                        printf("Invalid month and day combination.\n");
                        fail += 1;
                }
                if(*month1 == 2)
                {
                        if(*leap1 == 1 && *day1 > 29)
                        {
                            printf("Invalid month and day combination.\n");
                            fail += 1;
                        }
                        else if(*day1 > 28)
                        {
                            printf("Invalid month and day combination.\n");
                            fail += 1;
                        }
                }
                if(fail > 0)
                        continue;
                else
                        break;
        }

        for(;;)
        {
                int fail = 0;
                printf("\nEnter second date: ");
                scanf("%d/%d/%d", month2, day2, year2);
                if(*year1 == *year2)
                {
                        if(*month1 > *month2)
                        {
                                printf("Invalid entry.\n");
                                fail += 1;
                        }
                        if(*month1 == *month2 && *day1 > *day2)
                        {
                                printf("Invalid entry.\n");
                                fail += 1;
                        }
                }
                if(*month2 < 1 || *month2 > 12)
                {
                        printf("Invalid entry for month.\n");
                        fail += 1;
                }
                if(*day2 < 1 || *day2 > 31)
                {
                        printf("Invalid entry for day.\n");
                        fail += 1;
                }
                if(*year2 < 1)
                {
                        printf("Invalid entry for year.\n");
                        fail += 1;
                }
                if(daysPerMonth[month2] == 30 && *day2 > 30)
                {
                        printf("Invalid month and day combination.\n");
                        fail += 1;
                }
                if(*month2 == 2)
                {
                        if(*leap2 == 1 && *day2 > 29)
                        {
                            printf("Invalid month and day combination.\n");
                            fail += 1;
                        }
                        else if(*day2 > 28)
                        {
                            printf("Invalid month and day combination.\n");
                            fail += 1;
                        }
                }
                if(fail > 0)
                        continue;
                else
                        break;
        }
}

InformationsquelleAutor Andbrik | 2012-04-25