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How to print Hello World! As when learning any new language, the place to start is with the classic "Hello World!" program: #include <stdio.h> int main() {     printf("Hello, World!\n");     return 0; } Let's break down the code to understand each line: #include <stdio.h> The function used for generating output is defined in stdio.h. In order to use the printf function, we need to first include the required file, also called a header file. int main() The main() function is the entry point to a program. Curly brackets { } indicate the beginning and end of a function (also called a code block). The statements inside the brackets determine what the function does when executed. The printf function is used to generate output: printf(); Here, we pass the text "Hello World!" to it. The \n escape sequence outputs a newline character. Escape sequences always begin with a backslash \. The semicolon ; indicates the end of the...

Variables in C : A variable is a name for an area in memory. The name of a variable (also called the identifier) must begin with either a letter or an underscore and can be composed of letters, digits, and the underscore character. Variable naming conventions differ, however using lowercase letters with an underscore to separate words is common (snake_case). Variables must also be declared as a data type before they are used. The value for a declared variable is changed with an assignment statement. For example, the following statements declare an integer variable my_var and then assigns it the value 42: int my_var; my_var = 42; You can also declare and initialize (assign an initial value) a variable in a single statement: int my_var = 42; Let's define variables of different types, do a simple math operation, and output the results: #include <stdio.h> int main() {     int a, b;     float salary = 56.23;     char letter = 'Z'...