AFRICA CODER

--------------🧑‍💻🧑‍💻🧑‍💻🧑‍💻-----------            ✍️✍️✍️✍️✍️         AS GENERAL KNOWLEDGE-- DATATYPES          SIZES                 PRIM/REFE.       1.boolean      '         1 bit             '       primitive 2.byte             '         1 byte           '      primitive 3.short           '         2 byte            '      primitive 4. int               '         4 byte            '      primitive 5.long             '         8 byte            '      primitive 6.float             '        4 byte            '      primitive 7.double         '        8 bytes           '      primitive 8.char             '        2 bytes           '      primitive 9.string          '         varies             '     reference #what are primitives? and references? Comment your answer Follow @Africacoder 😊

✍🏻✍🏻......🌿🌿🌿......✍🏻✍🏻 Student subject grading source                   code in c++ ✍🏻✍🏻......🌿🌿🌿......✍🏻✍🏻 #include <iostream> using namespace std; int main(){ int marks; cout<<"Enter Your Marks: "; cin>>marks; if (marks >= 90) { cout<<"Your Grade is A+"; } else if (marks >= 80) { cout<<"Your Grade is A"; } else if (marks >= 70) { cout<<"Your Grade is B+"; } else if (marks >= 60) { cout<<"Your Grade is B"; } else if (marks >= 50) { cout<<"Your Grade is C"; } else if (marks >= 40) { cout<<"Your Grade is D"; } else if (marks >= 30) { cout<<"Your Grade is E"; } else if (marks <= 30) { cout<<"Your Grade is F"; } else { cout<<"Enter Valid Marks"; } return 0; }

🎲 Quiz 'C++ quiz : 1' Practice from lesson 1-4 🖊 5 questions · ⏱ 45 sec

C++ LESSON 4 : ✍🏻✍🏻......🌿🌿🌿......✍🏻✍🏻     Algorithms and flowcharts ➾are different mechanisms used for designing different programs, particularly in computer programming. ➾An algorithm is a step-by-step summary of the procedure ➾flowchart illustrates the steps of a program graphically.

C++ LESSON 3 : ✍🏻✍🏻......🌿🌿🌿......✍🏻✍🏻             Variables ➾are containers for storing data values. ➾ there are different types of variables (defined with different keywords), for example: ⓵. int - stores integers (whole numbers), without decimals, such as 123 or -123 ⓶. double - stores floating point numbers, with decimals, such as 19.99 or -19.99 ⓷. char - stores single characters, such as 'a' or 'B'. Char values are surrounded by single quotes ⓸. string - stores text, such as "Hello World". String values are surrounded by double quotes ⓹. bool - stores values with two states: true or false         Declaration of variables ➾syntax : data type variable name; Example: int a;         Initialization of variable ➾set value for declared variable ➾syntax : data type variable = variable value; ➾Example : int a =4;          Identifiers ➾are the unique names given to variables, classes, functions, or other entities by the programmer. ➾For example, int money; ➾Only alphabetic characters, digits, and underscores are allowed. ➾The identifier name cannot start with a digit, i.e., the first letter should be alphabetical. After the first letter, we can use letters, digits, or underscores. In C++, uppercase and lowercase letters are distinct. Therefore, we can say that C++ identifiers are case-sensitive. ➾A declared keyword cannot be used as a variable name. For more information on identifiers https://www.javatpoint.com/cpp-identifiers ➾there are valid and invalid indentifiers Share our channel 👇👇 https://t.me/Africacoder

😎😎😎😎-------------------JAVA----------😎😎😎 LESSON 6: ARRAY AND 2D ARRAYS ✅An array is a collection of items stored at contiguous memory locations. The idea is to store multiple items of the same type together. ✳️Multidimensional Arrays can be defined in simple words as array of arrays. Data in multidimensional arrays are stored in tabular form (in row major order). *In the array there will be: data_type : type of data to be stored in the array dimension: the dimension of the array is created. like 1D, 2D ... array_name: name of the array finally , the size of the array. #example_of_array:; class CODER { public static void main (String[] args) { // declares an Array of integers. int[] arr; // allocating memory for 5 integers. arr = new int[5]; // initialize the first elements of the array arr[0] = 10; // initialize the second elements of the array arr[1] = 20; //so on... arr[2] = 30; arr[3] = 40; arr[4] = 50; // accessing the elements of the specified array for (int i = 0; i < arr.length; i++) System.out.println("Element at index " + i + " : "+ arr[i]); } } 2D array:- class Learn { public static void main(String[] args) { int[][] arr = new int[10][20]; arr[0][0] = 1; System.out.println("arr[0][0] = " + arr[0][0]); } } https://t.me/Africacoder 😊 ይቀጥላል ቤተሰብ መልካም ቀን ተመኘን 🙏

LESSON 5: JAVA MATH: ⚜️The Java Math class has many methods that allows you to perform mathematical tasks on numbers. ✳️The Math.sqrt(x) method returns the square root of x. ✳️The Math.max(x,y) method can be used to find the highest value of x and y. ✳️ The Math.abs(x) method returns the absolute (positive) value of x. ❤️ Math.random() returns a random number between 0.0 (inclusive), and 1.0 (exclusive). public class Firsta {   public static void main(String[] args) {     double x,y,z;           /*double x = 3.14;       double y = 3.41;             double z = Math.max(x, y);       double a = Math.sqrt(5);       double ab = Math.ceil(x);// maximum number       double ac = Math.floor(y);// minimum number       System.out.println(z);*/      System.out.println(a);       System.out.println(ab); ‼️THERE ARE ALOT OF METHODS IN JAVA FOR FURTHER MATHEMATICAL OPERATIONS

✍🏻✍🏻......🌿🌿🌿......✍🏻✍🏻 source code of calculator                  in c++ ✍🏻✍🏻......🌿🌿🌿......✍🏻✍🏻 # include <iostream> using namespace std; int main() {   char op;   float num1, num2;   cout << "Enter first operands: ";   cin >> num1;     cout << "Enter operator: +, -, *, / : ";   cin >> op;    cout << "Enter second operands: ";   cin >> num2;   switch(op) {     case '+':       cout << num1 << " + " << num2 << " = " << num1 + num2;       break;     case '-':       cout << num1 << " - " << num2 << " = " << num1 - num2;       break;     case '*':       cout << num1 << " * " << num2 << " = " << num1 * num2;       break;     case '/':       cout << num1 << " / " << num2 << " = " << num1 / num2;       break;     default:       // If the operator is other than +, -, * or /, error message is shown       cout << "Error!"<<op<<" is not operator";       break;   }   return 0; } Share our channel 👇👇 https://t.me/Africacoder

What are you using in your projects?👇 if else = 😁 switch case = 😢 መልካም ምሽት 🙏 @Africancoder😊

👆👆Relational operators👆👆    🙋🙋exercise 🙋🙋 Say true(T) or false (F) 1. 5! = 6 2. 2.5 <= 7 3.−5 >= 0.1 ❗❗Write your answer in comment below❗❗