C Tutorials

Constants

Constants are names given to entities that cannot be modified during the execution of program. They are fixed values. Types of constants in C are -

1. Integer constant

2. Character constant

3. Floating point constant

4. String constant

5. Enumeration constant

Example

#include<stdio.h>

#include<conio.h>

void main()

{

int q = 9 ;

const int a = 10 ;

q = 15 ;

a = 100 ; // creates an error

printf(“q = %d\na = %d”, q, a ) ;

}

The program given above creates an error. It is because we are trying to change the value of the constant variable (a = 100).

Constants

Beginner 5 Hours

Constants are names given to entities that cannot be modified during the execution of program. They are fixed values. Types of constants in C are -

1. Integer constant

2. Character constant

3. Floating point constant

4. String constant

5. Enumeration constant

Example

#include<stdio.h>

#include<conio.h>

void main()

{

int q = 9 ;

const int a = 10 ;

q = 15 ;

a = 100 ; // creates an error

printf(“q = %d\na = %d”, q, a ) ;

}

The program given above creates an error. It is because we are trying to change the value of the constant variable (a = 100).

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Frequently Asked Questions for c

The C language is a high-level, general-purpose programming language. It provides a straightforward, consistent, powerful interface for programming systems. That's why the C language is widely used for developing system software, application software, and embedded systems.The C programming language has been highly influential, and many other languages have been derived from it.

Step 1: Download Dev/C++
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Step 4: Write Your Program
Step 5: Save and Compile Code.
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Python is easier than C to learn.But C helps to learn the fundamentals of programming while Python focuses on doing the job. Because Python is made in C doesn't mean you need to learn it. It is supposed to be an opposite and make a fast learning environment, unlike C.

While C and C++ have their similarities, they are two different programming languages and should be viewed as such. Even today, some 50 years following C’s creation, there are still distinct use cases for both.To answer the question of whether you should learn C or C++, it’s important to first consider the type of program to which you want to apply your newfound knowledge.

C Program – File IO
C Program to Create a Temporary File.
C Program to Read/Write Structure to a File.
C Program to Rename a file.
C Program to Make a File Read-Only.
C program to Compare Two Files and Report Mismatches.
C Program to Copy One File into Another File.

While C is one of the easy languages, it is still a good first language choice to start with because almost all programming languages are implemented in it. It means that once you learn C language, it’ll be easy to learn more languages like C++, Java, and C#.


Begin your 1st C Program
Open any text editor or IDE and create a new file with any name with a .C extension. e.g. helloworld.c.
Open the file and enter the below code: #include <stdio.h> int main() { printf("Hello, World!" ); return 0; } Run Code >>
Compile and run the code.

Learning C programming within one week is a challenging task, and it may not be possible to become an expert in such a short period of time. However, you can still make progress and gain a basic understanding of the language in a week.

The equal-to operator ( == ) returns true if both operands have the same value; otherwise, it returns false . The not-equal-to operator ( != ) returns true if the operands don't have the same value; otherwise, it returns false.

Flag is a variable that is supposed to signalize. A more general answer is that a flag is a variable (usually boolean, ie having only two values like true/false, off/on, yes/no, etc) that indicates some program state. int flag=1; if(a>0

Understand the type of data that you are working with, such as whether it’s an integer or a character. C is based on data types, so understanding this characteristic is the foundation for writing programs that work well.Learn the operators. Operators are symbols that tell the compiler program what to do.

Use These 7 Tips to Help You Learn Computer Programming Faster
Focus on the Fundamentals.
Learn to Ask for Help.
Put Your Knowledge into Action.
Learn How to Code by Hand.
Check out Helpful Online Coding Resources.
Know When to Step Away and Take a Break from Code Debugging.
Do More Than Just Read Sample Code.

Ans: In the C language, \0 represents the null character. Not to be mistaken for the digit '0', it's a character with an ASCII value of zero. When you see \0 in code, you're looking at a single character that represents the number 0 in the ASCII table. It's often utilized as a marker or an endpoint, especially in strings.

The break is a keyword in C which is used to bring the program control out of the loop. The break statement is used inside loops or switch statement. The break statement breaks the loop one by one, i.e., in the case of nested loops, it breaks the inner loop first and then proceeds to outer loops.

The pointers in C language refer to the variables that hold the addresses of different variables of similar data types. We use pointers to access the memory of the said variable and then manipulate their addresses in a program.

Array in C can be defined as a method of clubbing multiple entities of similar type into a larger group. These entities or elements can be of int, float, char, or double data type or can be of user-defined data types too like structures.

In C, Boolean is a data type that contains two types of values, i.e., 0 and 1. Basically, the bool type value represents two types of behavior, either true or false. Here, '0' represents false value, while '1' represents true value.In C Boolean, '0' is stored as 0, and another integer is stored as 1. 

Loops provide an efficient way to run the same code multiple times, thus reducing redundancy and making code more concise. C offers several loops, including the for, while, and do-while loops, each with unique use cases. Whether iterating through arrays, reading multiple data inputs, or simply wanting to repeat an action until a certain condition is met, loops in C offer the flexibility and control to achieve these tasks effectively.

In computer programming, when void is used as a function return type, it indicates that the function does not return a value. When void appears in a pointer declaration, it specifies that the pointer is universal. When used in a function's parameter list, void indicates that the function takes no parameters.

The Null Character in C is a special character with an ASCII value of 0 (zero). It is not the same as the character ‘0’ which has an ASCII value of 48. The Null Character in C is used to denote the end of a C string, indicating that there are no more characters in the sequence after it. In memory, the Null Character in C is represented by a byte filled with all bits set to 0.

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