Question

Write a program that checks whether or not a date entered in by the user is valid. Display the date and say if it is valid. If it is not valid explain why.

• The input may be in the format mm/dd/yyyy, m/d/yyyy, mm/d/yyyy, or m/dd/yyyy.
• A valid month (mm) must be from 1 to 12
• A valid day (dd) must be from 1 to the appropriate number of days in the month
  • April, June, September, and November have 30 days
  • February has 28 except for leap years, then it has 29
  • The rest have 31 days
  • Leap years are years that are divisible by 4 BUT not divisible by 100 unless it is also divisible by 400

I don't need the coding. Just help with the questions 1 and 2.

1. Include a flow chart in your proposed solution section
2. Write the equivalent Boolean expression !(a>b)&&!(b==c) which doesn’t use the NOT operator (!). Assume that a, b, and c are integers.

Answer 1

Flowchart For Date Validity

Refer to below image and i am explaining the numbering mentioned there block by block what is being done

1. We are informing user to enter a date in the format of dd/mm/yyyy and take input from user and store value in three variables named as dd,mm,yy.

2. We are checking yy valid or not by if(yy>=1900 && yy<=9999)

3.If 2 is not true we are printing month is invalid

4. Here we are checking date is between 1 to 31 and months having 31 days along with that i.e Jan, Mar,May ,july ,Aug ,Oct ,Dec

like this

 if((dd>=1 && dd<=31) && (mm==1 || mm==3 || mm==5 || mm==7 || mm==8 || mm==10 || mm==12))

5. Here we are checking date is between 1 to 30 and months having 30 days along with that i.e April ,June ,Sept,November.

((dd>=1 && dd<=30) && (mm==4 || mm==6 || mm==9 || mm==11))

6. A special for date of february is done i.e data is between 1 to 28 and month is february or mm==2;

((dd>=1 && dd<=28) && (mm==2))

7. Checking Leap Year And If it is a leap yera then February has 29 days so check for both

(dd==29 && mm==2 && (yy%400==0 ||(yy%4==0 && yy%100!=0)))

8. If all of the 4 5 6 7 block dissatisfy then we print date is invalid.

9. If any of the block 4 5 6 7 block satisfy the condition then we print date is valid

10 . Put each last block to end .

Flowchart Ends

Q2

Boolean Expression is