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C Programming Files I/O

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C Programming Files I/O There are a large number of functions to handle file I/O (Input Output) in C. In this tutorial, you will learn to handle standard I/O in C using fprintf(), fscanf(), fread(), fwrite(), fseek.and more. In C programming, file is a place on your physical disk where information is stored. Why files are needed? When a program is terminated, the entire data is lost. Storing in a file will preserve your data even if the program terminates. If you have to enter a large number of data, it will take a lot of time to enter them all. However, if you have a file containing all the data, you can easily access the contents of the file using few commands in C. You can easily move your data from one computer to another without any changes. Types of Files When dealing with files, there are two types of files you should know about: Text files Binary files 1. Text files Text files are the normal .txt files that you can easily create using Notepad ...
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C Program to Display Prime Numbers Between Two Intervals #33

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C Program to Display Prime Numbers Between Two Intervals Example to print all prime numbers between two numbers (entered by the user). This problem is solved using nested for loop and if...else statement. To understand this example, you should have the knowledge of following  C programming topics: C if...else Statement C Programming for Loop C Programming break and continue Statement Example #1: Display Prime Numbers Between two Intervals #include <stdio.h> int main () { int low , high , i , flag ; printf ( "Enter two numbers(intervals): " ); scanf ( "%d %d" , & low , & high ); printf ( "Prime numbers between %d and %d are: " , low , high ); while ( low < high ) { flag = 0 ; for ( i = 2 ; i <= low / 2 ; ++ i ) { if ( low % i == 0 ) { flag = 1 ; break ; } ...
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C Data Types

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C Programming Data Types In this tutorial, you will learn about data types and how to declare a variable in C programming. In C programming, variables or memory locations should be declared before it can be used. Similarly, a function also needs to be declared before use. Data types simply refers to the type and size of data associated with  variables  and functions. Data types in C Fundamental Data Types Integer types Floating type Character type Derived Data Types Arrays Pointers Structures Enumeration This tutorial will focus on fundamental data types. To learn about derived data types, visit the corresponding tutorial. int - Integer data types Integers are whole numbers that can have both positive and negative values but no decimal values. Example: 0, -5, 10 In C programming, keyword  int  is used for declaring integer variable. For example: int id; Here,  id  is a variable of type integer. You can de...
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C if...else Statement

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C if...else Statement In programming, decision making is used to specify the order in which statements are executed. In this tutorial, you will learn to create decision making program using if...else statements. C if statement if (testExpression) { // statements } The  if  statement evaluates the test expression inside the parenthesis. If the test expression is evaluated to true (nonzero), statements inside the body of  if  is executed. If the test expression is evaluated to false (0), statements inside the body of  if  is skipped from execution. To learn more on when test expression is evaluated to nonzero (true) and 0 (false), check out  relational  and  logical operators . Flowchart of if statement Example #1: C if statement // Program to display a number if user enters negative number // If user enters positive number, that number won't be displayed #include <stdio.h> int main () { i...
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Learn C Programming The Definitive Guide C is a powerful general-purpose programming language. It is fast, portable and available in all platforms. If you are new to programming, C is a good choice to start your programming journey. This is a comprehensive guide on how to get started in C programming language, why you should learn it and how you can learn it. TABLE OF CONTENTS ·         C Tutorials ·         What is C Programming? ·         Reasons to Learn C ·         Your First C Program ·         Recommended Books ·         Things to Remember What is C (Programming Language)? - The Basics Before getting started with C programming, lets get familiarized with the language first. C is a general-purpose programming language used for wide rang...
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While and Do...While Loop

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C Programming while and do...while Loop Loops are used in programming to repeat a specific block of code. After reading this tutorial, you will learn how to create a while and do...while loop in C programming. Loops are used in programming to repeat a specific block until some end condition is met. There are three loops in C programming: for loop while loop do...while loop while loop The syntax of a while loop is: while (testExpression) { //codes } where,  testExpression  checks the condition is true or false before each loop. How while loop works? The while loop evaluates the test expression. If the test expression is true (nonzero), codes inside the body of while loop are exectued. The test expression is evaluated again. The process goes on until the test expression is false. When the test expression is false, the while loop is terminated. Flowchart of while loop Example #1: while loop // Program to find factorial of a numb...
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