Language C
Description It accepts the number of the month in a year and returns the number of days in that month.
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#include <stdio.h>
#include <stdlib.h>

int main (void)
{
    int number_of_days, number_of_the_month;
    printf ("Enter the value of number of the month: ");
    scanf ("%d", &number_of_the_month);
    (void) getchar ();
    number_of_days=0;
    if(number_of_the_month==2)
        number_of_days=28;
    if(number_of_the_month==1||number_of_the_month==3||number_of_the_month==5||number_of_the_month==7||number_of_the_month==8||number_of_the_month==10||number_of_the_month==12)
        number_of_days=31;
    if(number_of_the_month==4||number_of_the_month==6||number_of_the_month==9||number_of_the_month==11)
        number_of_days=30;
    if(number_of_the_month<1||number_of_the_month>12)
        printf ("Wrong month number\n");
    printf ("Value of number of days: %d\n", number_of_days);
    putchar ('\n');
    system ("pause");
    return EXIT_SUCCESS;
}