Illustration of integer airthmetic

Program 7) This program shows the use of integer airthmetic to convert a given number of days into month and days.

                                 PROGRAM
 main( )
  {
        int months, days ;

        printf("Enter days\n") ;
        scanf("%d", &days) ;

        months = days/30 ;
        days = days % 30 ;
        printf("Months = %d Days = %d, months, days) ;
        getch( ) ;
 }     

Output:          Enter days 
                        265
                    months = 8 days = 25
                    Enter days
                       364
                    Months = 12 Days = 4
                    Enter days
                       45
                    Months = 1 days = 15  

The variables months and days are declared as integers. Therefore, the statement 
                   months = days/30;
truncates the decimal part and assigns the integer part to months. Similarly, the statement 
                  days = days%30 ;
assigns the remainder part of the divison to days. Thus the given numberof days in converted into an equivalent number of months and days and the result is printed as shown in the output.