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Introduction to c++
Here is a potential solution to the problem in C++: #include <iostream> using namespace std; int main() { int num1, num2, num3; cout << "Enter three numbers: "; cin >> num1 >> num2 >> num3; int total = num1 + num2 + num3; float average = total / 3.0; cout << "The numbers entered were: " << num1 << ", " << num2 << ", " << num3 << endl; cout << "Their average is: " << average; return 0; } Some key points: - Use cin to input the 3 numbers from the
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Introduction to c++
- 1. Introduction to C++ BYHIMANSHU KAUSHIK
- 2. What is c++? C++ is a object-oriented language It is the “successor” to C, a procedural language (the “++” is called the successor operator in C++) C was derived from a language called B which was in turn derived from BCPL C was developed in the 1970’s by Dennis Ritchie of AT&T Bell Labs C++ was developed in the early 1980’s by Bjarne Stroustrup of AT&T Bell Labs. Most of C is a subset of C++
- 3. People & Programs User: an individual who runs, or executes, a program Programmer: an individual who creates, or writes, a program
- 4. C++ Programming Consistsof… Declarations Define the use of various identifiers, thus creating the elements used by the program (computer) Statements Or executable statements, representing actions the computer will take on the user’s behalf
- 5. Identifiers Names forvarious entities used in a program; used for... Variables: values that can change frequently Constants: values that never changes Functions: programming units that represents complex operations Parameters: values that change infrequently
- 6. A Simple c++Program #include <iostream.h> int main() { // Declarations // Statements return 0; }
- 7. The Header File #include<iostream.h> int main() { // Declarations // Statements return 0; } Compiler directive: Tells the compiler what to do before compiling This one includes source code from another file
- 8. The Main Statement #include<iostream.h> int main() { // Declarations // Statements return 0; } Header for main function States… data type for the return value identifier for function list of arguments between parenthesis (none for this function)
- 9. The Braces #include <iostream.h> intmain() { // Declarations // Statements return 0; } Braces enclose the body of the function They represent the start and end of the function
- 10. The Declaration Statement #include<iostream.h> int main() { // Declarations // Statements return 0; } Declarations and statements Main body of function (or main part) “//” represents the start of a comment
- 11. The return Statement #include<iostream.h> int main() { // Declarations // Statements return 0; } Return statement specifies the value the function returns All (almost) declarations and statements end with a semi-colon “;”
- 12. Sample C++ Program #include<iostream.h> void main() { int number; cout << “Enter a number” << endl; cin >> number; cout << “You entered: “ << number << endl; } What is the Output of this Program?
- 13. The DataTypes #include <iostream.h> voidmain() { int number; cout << “Enter a number” << endl; cin >> number; cout << “You entered: “ << number << endl; } Variable declaration The identifier number is declared as being of data type int, or integer
- 15. The Count ? #include<iostream.h> void main() { int number; cout << “Enter a number” << endl; cin >> number; cout << “You entered: “ << number << endl; } cout the output statement for C++ Note the direction of “<<“ endl represents an end-of-line
- 16. Cin ? #include <iostream.h> voidmain() { int number; cout << “Enter a number” << endl; cin >> number; cout << “You entered: “ << number << endl; } cin the input statement for C++ Note the direction of “>>”
- 17. Copy That Down #include<iostream.h> void main() { int number; cout << “Enter a number” << endl; cin >> number; cout << “You entered: “ << number << endl; }
- 18. Value Assignment Inc++ Assignment is an operation that assigns the value of an expression to a variable Ex. Total = 2 + 3 + 5 First, the expresssion “2 + 3 + 5” is evaluated Then, this value is assigned to the variable “Total”
- 19. Assignment When avariable is declared, space is allocated in the computer’s memory for the variable Each data type requires a different number of bytes in memory for storing a variable int - 2 float - 4 double - 8 char, bool - 1
- 20. Arithmetic Operations Addition: 2+ 3 Subtraction: 5 - 2 Multiplication: 10 * 4 Division: 12 / 3
- 21. I Have Aproblem for you Problem: To determine the average of three numbers Task: Request, from the user, three numbers, compute the average and the three numbers, and print out the original values and the computed average Do it! You have 20 minutes!
- 22.