WAP WHICH ACCEPTS A CHARACTER FROM THE USER AND CHECKS IF IT IS A AN ALPHABET, DIGIT OR PUNCTUATION MARK

IF IT IS ALPHABET , CHECK IF IT IS UPPERCASE AND THEN CHANGE THE CASE


#include<stdio.h>
#include<math.h>
main()
{
char ch;
printf("Enter a character");
scanf("%c",&ch);
if(isalpha(ch))
{
printf("%c is an alphabet",ch);
if(isupper(ch))
printf("%c",tolower(ch));
else
printf("%c",toupper(ch));
}
else if(isdigit(ch))
{
printf("%c is a digit",ch);
}
else if(ispunct(ch))
{
printf("%c is a punctuation mark");
}
}



ASSIGNMENT 6)

  TO DEMONSTRATE MENU DRIVEN PROGRAMS AND USE OF STANDARD LIBRARY FUNCTIONS

You should read following topics before starting this exercise

   1) Use of Switch statement to create menus as in Assignment 3.

   2) Use of while and do- while as in Assignment 4.

ctype.h : contains function prototypes for performing various operations on characters. Some commenly used functions are listed below.

FUNCTION                                                               PURPOSE

isalpha()                                  check whether a character is alphabet

isalnum()                                 check whether a character is alphanumeric

isdigit()                                    check whether a character is a digit

isspace()                                   check whether a character is space

ispunct()                                   check whether a character is a punctuation mark

isupper()                                   check whether a character is in uppercase

islower()                                   check whether a character is in lowercase

toupper()                                   converts a character to uppercase

tolower()                                   converts a character to lowercase

math.h() : this function is used to perform various mathematical operations

ceil                                           smallest integer not less than parameter
cos
cosh
exp(double x)                           computes e^x
fabs                                           absolute value
floor                                          largest integer not less than parameter      
fmod                                          floating point reamainder
log
log10
pow(x,y)                                   computes x^y
sin
sinh
sqrt
tan
tanh

Menu Driven program

   A program that obtains input from a user by displaying a list of options – the menu – from which the user indicates his/her choice. Systems running menu-driven programs are commonplace, ranging from microprocessor controlled washing machines to bank cash dispensers. In the case of the cash dispenser, single keys are pressed to indicate the type of transaction (whether a receipt is wanted with the cash, or if a statement of the bank balance is required) and with many, a single key is pressed to indicate the amount of money required.

Menu-driven systems are advantageous in two ways: firstly, because input is via single key strokes, the system is less prone to user error; secondly, because only a limited range of characters are “allowed”, the way in which the input is to be entered is unambiguous. This contributes toward making the system more user-friendly. Compare command-line interface.

Here is a demo for you to write a menu driven cpp program