1. Problem A Character literals

1.1 Specification

Write an ANSI-C program that reads input from the Standard input, and then outputs the processed information on the Standard output.

Each user input contains an integer, followed by a blank and then a character. If the character does represent a digit, e.g., '3', (how to check?), then the program outputs the sum of the integer and the numerical value that this character represents (how to get the numerical value of a character such as '3'?). If the character does not represent a digit, e.g., 'A', the program outputs that the character is not a digit.

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The program continues until the input integer is -10000 (and is followed by a blank and any one character).

1.2 Implementation

• name your program lab2A.c

• keep on reading and processing input, until an integer -10000 is read.

• use scanf ("%d %c", ..) to read inputs.

• define a Boolean function isDigit(char c) to determine if c represents a digit. We mentioned in class that ANSI-C does not have a type `boolean, instead it uses 0 to

represent false, and use non-zero integer to represent true. So, as a general practice in C, your function should return a non-zero number (usually 1) if c is a digit and returns 0

otherwise.

Note that you should NOT use if c=='0' c=='1' c=='2' c=='3' c=='9'. Instead, use the one-statement trick that we discussed in class.

• Note that in getting the numerical value of a digit character such as '3', you should NOT use if c=='0' c=='1' c=='2' c=='3' c=='9'. Instead, use the one-statement trick that we discussed in class.

• put the definition (implementation) of function isDigit after your main function.

• display the prompt and output as shown below.

1.3 Sample Inputs/Outputs: (ONE blank line between each interaction/iteration):

red 338 % gcc Wall lab2A.c -o lab2a

red 339 % lab2a

Enter an integer and a character separated by blank>12 c Character 'c' does not represent a digit

Enter an integer and a character separated by blank>12 9 Character '9' represents a digit. Sum of 12 and 9 is 21

Enter an integer and a character separated by blank>100 8 Character '8' represents a digit. Sum of 100 and 8 is 108

Enter an integer and a character separated by blank>120 ! Character '!' does not represent a digit

Enter an integer and a character separated by blank>-10000 a red 340 %

Submit your program by issuing submit 2031Z lab2 lab2A.c

2. Problem B character literals

2.1 Specification

Write an ANSI-C program that uses getchar and putchar to read from the Standard input, and outputs (duplicates) the characters to the Standard output. For each input character that is a lower-case letter (how to check?), converts it into the corresponding upper case letter in the output (how to convert?). The program continues to read and output until EOF is entered.

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2.2 Implementation

You might want to start with the template file copy.c provided for lab1.

• name your program lab2B.c

• use getchar() and a loop to read characters.

• use putchar() to print the input characters on the standard output.

• do NOT use any other C library functions. Do your own checking and conversion. However, you should NOT use if c=='A' c=='B' c=='C' c=='D' c=='Z'. Instead, use the one-statement trick discussed in class. ch as islower(), toupper().

2.3 Sample Inputs/Outputs (from Standard input):

red 308 % gcc Wall o lab2b lab2B.c

red 309 % lab2b

Hello The World

HELLO THE WORLD

How Old Are You?

HOW OLD ARE YOU?

I am 22, and THANKs!

I AM 22, AND THANKS!

^D (press Ctrl and D)

red 310 %

2.4 Sample Inputs/Outputs (from redirected input file):

Using your favorite text editor, create a text file my_input.txt that contains hEllo

How Are You!

I Am Good and THAnKs!

red 311 % lab2b < my_input.txt

HELLO

HOW ARE YOU!

I AM GOOD AND THANKS!

red 312 %