A practical introduction to Pascal programming language - GIARA

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Alternative constructionswriteln(’The value in the middle is: ’,b)else if (min(b,c)
A Practical Introduction to Pascal Programming LanguageExercise 2.5. Write a program that reads two chars from the keyboard. Then, the program mustdisplay which one is the precedent in alphabetic order (regardless of the case). In case any ofthe char is not a letter, a warning message must be displayed.□In this case we have to proceed in two consecutive steps: (1) checking the validity of thevalues input by the user and (2) deciding which is the precedent in alphabetical order. In orderto do the first, we check that the upper and lower version of the variables are not the same. Thisproperty is only satisfied by the letters, since the remaining characters don’t have upper andlower version. Then, in order to compare the letters regardless of their case, we turn both toupper case and compare.Program 21: Exercise 2.5program c02e05;varc1,c2:char;begin(* Reading the data*)write(’Please type the first char: ’);readln(c1);write(’Please type the second one: ’);readln(c2);(* Comparing the chars*)if (upcase(c1)=lowercase(c1)) thenwriteln(’The first char is not a letter’)else if (upcase(c2)=lowercase(c2)) thenwriteln(’The second char is not a letter’)else if (upcase(c1)>upcase(c2)) thenwriteln(’The first letter is [’,c2,’] while the second is [’,c1,’].’)elsewriteln(’The first letter is [’,c1,’] while the second is [’,c2,’].’)end.⊡Exercise 2.6. Write a program that reads an integer from the keyboard and says whether it iseven or odd.□This program is very simple once we understand that the modulus of a number in the divisionby 2 is 0 if and only the number is even.Program 22: Exercise 2.6program c02e06;varn:integer;beginwriteln(’Please type an integer: ’);readln(n);if (n mod 2 = 0) thenwriteln(’The number ’,n,’ is even’)elsewriteln(’The number ’,n,’ is odd’)end.⊡26
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