Completed C variables

c_variables.c

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+#include<stdio.h>
+
+int main(){
+
+
+
+    /*Variables are containers for storing data values, like numbers and characters.
+
+    In C, there are different types of variables (defined with different keywords), for example:
+
+        int - stores integers (whole numbers), without decimals, such as 123 or -123
+        float - stores floating point numbers, with decimals, such as 19.99 or -19.99
+        char - stores single characters, such as 'a' or 'B'. Characters are surrounded by single quotes
+        
+    type variableName = value;*/
+
+    int myNumber = 35;          // Integer (whole number)
+    float myFloatNum = 3.141;   // Floating point number
+    char myLetter = 'D';       // Character
+
+    /*Format Specifiers
+    
+    Format specifiers are used together with the printf() function 
+    to tell the compiler what type of data the variable is storing. 
+    It is basically a placeholder for the variable value.
+
+    A format specifier starts with a percentage sign %, followed by a character.
+
+    For example, to output the value of an int variable, 
+    use the format specifier %d surrounded by double quotes (""), inside the printf() function
+    */
+
+    printf("My Favourite Number is: %d\n",myNumber);
+    printf("Value of Pi: %f\n",myFloatNum);
+    printf("Third letter of the Albhabet is: %c!!!\n\n",myLetter);
+    printf("ha!ha!ha! Though Pi is %f, my favourite number is %d and the third letter of the Alphabet is c not %c.\n\n", myFloatNum, myNumber, myLetter);
+
+
+    /*Change Variable Values
+    If you assign a new value to an existing variable, it will overwrite the previous value.*/
+
+    int myNewNumber = 25;  
+    myNumber = myNewNumber;     // Now the myNumber value changed to 25 from 35.
+
+    printf("Changed value of Favourite Number is: %d\n",myNumber);
+
+    // Value reassignement from one variable to another 
+
+    char myNewLetter = 'C';
+
+    myLetter = myNewLetter;
+
+    printf("Third letter of the Albhabet is: %c.\n\n",myLetter);
+
+
+    /*Value can be copied to empty variable*/
+
+    // Declare a myOtherNum variable without assigning it a value
+    int myOtherNum;
+
+    // Assign value of myNum to myOtherNum
+    myOtherNum = myNewNumber;
+
+    printf("New value assigned to empty variable 'myOtherNum' is : %d \n\n", myOtherNum);
+
+
+    /*Adding variables togather*/
+
+    int x = 5;
+    int y = 6;
+
+    int sum = x+y;
+
+    printf("The sum of x & y =  %d\n", sum);
+
+    /*Declare Multiple Variables
+    
+    To declare more than one variable of the same type, use a comma-separated list:
+    */
+
+    int a = 5, b =6, c = 50;
+
+    printf("sum: %d\n\n",a+b+c);
+
+    //You can also assign the same value to multiple variables of the same type:
+
+    int z,s,t;
+
+    z=s=t=40;
+
+    printf("%d\n\n",z+s+t);
+
+
+    /*C Variable Names
+    All C variables must be identified with unique names.
+
+    These unique names are called identifiers.
+
+    Identifiers can be short names (like x and y) or more descriptive names (age, sum, totalVolume).
+
+    Note: It is recommended to use descriptive names in order to create understandable and maintainable code
+    
+    The general rules for naming variables are:
+
+        Names can contain letters, digits and underscores
+        Names must begin with a letter or an underscore (_)
+        Names are case sensitive (myVar and myvar are different variables)
+        Names cannot contain whitespaces or special characters like !, #, %, etc.
+        Reserved words (such as int) cannot be used as names*/
+
+    int minutesPerHour = 60;
+
+    printf("It is a good practice to use discreptive names for variables like minutesPerHout = %d\n. ", minutesPerHour);
+
+    return 0;
+
+}