Assembly Language Array Not Being Read From C++ User Input

BASICs of C/C++ Programming

Writing simple C++ programs

Case 1

//  Elementary printing code.  #include <iostream> using namespace std;  int principal() { 	int a = ten, b = 20; 	     cout << "sum is" << a + b << endl; 	cout << "product is " << a*b << endl;  	return 0; }          

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A typical c++ plan uses several header files in order to apply the library routines that has been developed already. In the in a higher place example, the statement #include <iostream> indicates that we demand the I/O library. The statement "#using namespace std;" says that this example employ output operator "<<" divers in the standard name infinite. In this example, a user has declared two integers a and b; and, they are initialized to x and 20 respectively. Finally it computes the sum and products of a and b and outputs them on the panel as shown below.

Example 2

//  Unproblematic press code. //  #include <iostream> using namespace std;  int main() { 	int a, b; 	cout << "Input a:"; cin >> a; 	     cout << "Input b:"; cin >> b; 	     cout << "sum is" << a + b << endl; 	     cout << "production is " << a*b << endl;  	return 0; }          

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This example is very like to the previous i except that the user inputs the values "a" and "b" and they are read using the input operator "cin". Finally the code calculates and prints the values of the sum and production of a and b

Data types

Computer stores the variables in the retentivity. Therefore, computer needs to know what kind of data we store and then that computer reserves some memory space for the variable. A Byte [B] is the minimum amount of memory space for a calculator. I Byte is eight bits and a bit is either 0 or one. 1KB=2^8=1024 Bytes Data type is defined as a set of values together with a gear up of operations. C++ data types may be grouped into iii categories:

Elementary

Structured

Pointer

Simple Data Types:

There are three categories within the uncomplicated data type

1. Integral: integer (Whole numbers)
2. Floating-point: Real numbers
3. Enumeration type: user-defined information type
4. Important Variants integral information types are
1. int
2. bool
3. Char

It is also the number of bytes taken by a data type is compiler dependent. short or brusk int data type covers whole numbers that can be positive or negative (-128 to 127). unsigned short int takes just positive number (0 to 255)

Examples:

• -6728
• 0
• 78
• +763
• P78
1. Notation that + sign is optional
2. No commas should exist used within an integer (east.g. 10.825 is wrong)

In order to use a variable in C++, the variables should exist declared first with the types.

Case.1

Following programme has int a, b, and c. a and b values are given and find c. Prints a, b, and c

#include <iostream>  using namespace std;   int main()   { 	int a=10, b=5, c; 	    c = a*b; 	        cout << "a = " << a <<", b= "<<b<<endl;  	cout << "c = " << c << endl;  	return 0; }          

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Case.1:

Following program has int a, b, and c. user tin enter a and b values and calculate c. Prints a, b, and c

            #include <iostream>  using namespace std;   int principal()   { 	int a, b, c;  	cout<<"Enter integer a and b values :";  	cin>>a>>b; 	c = a*b;  	cout << "a = " << a <<", b= "<<b<<endl;  	cout << "c = " << c << endl;  	return 0; }          

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Information technology is practiced habit to have prompt before cin command and so that user knows that he has to respond.

bool Information Type

bool type

• Two values: true and imitation
• Dispense logical (Boolean) expressions

truthful and simulated are called logical values

bool, true, and false are reserved words

char Data Type

The smallest integral data type

Used for characters: letters, digits, and special symbols

Each character is enclosed in unmarried quotes

• 'A', 'a', '0', '*', '+', '$', '&'

A blank space is a grapheme and is written ' ', with a space left between the single quotes

Instance

#include <iostream>  using namespace std;   int main()   { 	char x1='C';  	char x2='P';  	cout<<" This is a exam..."<<endl;  	cout<<"Answer : "<<x1<<x2<<x2<<endl;  	return 0; }        

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Outcome

Example

It is practiced addiction to have prompt before cin command so that user knows that he has to respond.

#include <iostream>  using namespace std;   int master()   { 	char x1='C', x2='P';  	cout<<" This is a test..."<<endl;  	cout<<" Respond : "<<x1<<x2<<x2<<endl;  	cout<<endl;   	return 0; }        

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Example

#include <iostream>  using namespace std;   int main()   { 	char x1, x2;  	cout<<" Enter x1 and x2 chacaters:";  	cin>>x1>>x2;  	cout<<" This is a test..."<<endl;  	cout<<" Reply : "<<x1<<x2<<x2<<endl;  	cout<<endl;    return 0;  }        

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Consequence

Real Numbers

1. C++ uses scientific annotation to represent real numbers (floating-indicate note or scientific notation)
2. This allows a user to represent as well small and too large numbers
1. 3.141592
2. 0.3679
3. 1.602e-19
4. 3.4e+64 ( l! L factorial)
5. 1.2e9 (1.ii GHz)
3. Existent numbers may exist classified as float and double

[We always employ double in our lawmaking equally it is more accurate than float]

Instance

#include <iostream>  using namespace std;   int principal()   { 	double x1, x2;  	cout<<" Enter x1 and x2 double numbers:";  	cin>>x1>>x2;  	cout<<" This is a test..."<<endl;  	cout<<" Full : "<< x1 <<" + "<< x2 <<" = "<< x1+x2 << endl;  	cout<<endl;    return 0; }        

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Outcome

Example

#include <iostream>  using namespace std;   int main()   { 	double x1, x2, total;  	cout<<" Enter x1 and x2 double numbers:";  	cin>>x1>>x2; 	total=x1+x2;  	cout<<endl;  	cout<<" Total : "<< x1 <<" + "<< x2 <<" = "<< total << endl;  	cout<<endl;    return 0; }        

Result

Enumerated information types allows to designate a symbolic name for each integer.

This method Improves readability of your code

Examples

enum management {North, South, East, West};

// Here North=0, Southward =1, Eastward =2, and W =3

enum radixchoice {binary, octal, decimal, hex};

At present ane define a variable effectually this enumerated type management myheading = East; radixchoice mybase=hex;

Variables

Variable is a location in memory where a value can be stored. Declare variables with data type and proper noun before utilize

Instance int x1; int x2; int sum;

You lot can declare several variables of same blazon in one declaration Comma separated listing

int x1, x2, sum;

Variable name must be a valid identifier

Series of characters (letters, digits, underscores)

Cannot begin with digit

Case sensitive (uppercase letters are different from lowercase letters)

Use identifiers of 31 characters or fewer

Avoid identifiers that begin with underscores and double underscores, considering C++ compilers may use names similar that for their own purposes internally

There are some reserved keywords for C++, avoid using them as variable names.

It is ameliorate to place a infinite after each comma (,) to brand programs more readable. If y'all like you lot tin declare each variable on a split up line. And so that you to identify a comment next to each proclamation

It is improve to place declarations at the outset of a function and separate them from the executable statements with one blank line to highlight where the declarations stop and the executable statements begin

The following list shows the some reserved words in C++. These reserved words may not exist used as constant or variable or any other identifier names.

Example

          #include <iostream>  using namespace std;   int main()   { 	double x1, x2, total;  	cout<<" Enter x1 and x2 double numbers:";  	cin>>x1>>x2; 	total=x1+x2;  	cout<<endl;  	cout<<" Total : "<< x1 <<" + "<< x2 <<" = "<< total << endl;  	cout<<endl;    return 0; }        

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Global Variables:

Global variables are defined outside of all the functions, ordinarily on top of the programme. The global variables are available for employ the entire program afterward the proclamation and tin can be accessed past any role in the program. Following are some examples using global and local variables:

Instance

#include <iostream>  using namespace std;  // Global variable annunciation: int Y;   int chief ()   {  	// Local variable declaration:   	int a, b; // actual initialization   	a =10;   	b =xx;   	Y = a + b;   	cout <<"The full is :"<< Y<<endl;     render 0; }        

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Effect

Note:Notation: If a program can have aforementioned name for local and global variables, the value of local variable inside a function will take preference.

Example

#include <iostream>  using namespace std;   // Global variable declaration:   int Y;   int main ()   {  	// Local variable declaration and nitialization :   	int a=ten, b=20,Y=30;  	      Y = a + b + Y;   	cout <<"The total is :"<< Y << endl;    render 0; }        

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Effect

Operators:

Operators tells the compiler to perform specific mathematical or logical operations. C++ has post-obit born operators:

Arithmetic Operators

Relational Operators

Logical Operators

Bitwise Operators

Consignment Operators

Arithmetic Operators:The following arithmetic operators supported by C++ language:

The increment operator ++ adds 1 to its operand, and the decrement operator -- subtracts ane from its operand

Example:

Example x = x+1; tin be written as ten++; //postfix grade

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Source: https://www.cpp.edu/~elab/ECE114/Basic-of-C++.html

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