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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 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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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 switch...case Statement

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C switch...case Statement In this tutorial, you will learn to write a switch statement in C programming (with an example). The  if..else..if  ladder allows you to execute a block code among many alternatives. If you are checking on the value of a single variable in  if...else...if , it is better to use  switch statement. The switch statement is often faster than nested  if...else  (not always). Also, the syntax of switch statement is cleaner and easy to understand. Syntax of switch...case switch (n) ​{ case constant1: // code to be executed if n is equal to constant1; break; case constant2: // code to be executed if n is equal to constant2; break; . . . default: // code to be executed if n doesn't match any constant } When a case constant is found that matches the switch expression, control of the program passes to the block of code associated with that case...
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C Standard Library Functions

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C Standard Library Functions In this article, you'll learn about the standard library functions in C. More specifically, what are they, different library functions in C and how to use them in your program. C Standard library functions or simply C Library functions are inbuilt  functions  in C programming. The prototype and data definitions of the functions are present in their respective header files, and must be included in your program to access them. For example:  If you want to use  printf()  function, the header file  <stdio.h>  should be included. #include <stdio.h> int main () { // If you use printf() function without including the <stdio.h> // header file, this program will show an error. printf ( "Catch me if you can." ); } There is at least one function in any C program, i.e., the  main()  function (which is also a library function). This function is automatically called ...
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C Programming Enumeration

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C Programming Enumeration In this article, you will learn to work with enumeration (enum). Also, you will learn where enums are commonly used in C programming. An enumeration is a user-defined data type that consists of integral constants. To define an enumeration, keyword  enum  is used. enum flag { const1, const2, ..., constN }; Here, name of the enumeration is  flag . And,  const1 ,  const2 ,....,  constN  are values of type  flag . By default,  const1  is 0,  const2   is 1 and so on. You can change default values of enum elements during declaration (if necessary). // Changing default values of enum enum suit { club = 0, diamonds = 10, hearts = 20, spades = 3, }; Enumerated Type Declaration When you create an enumerated type, only blueprint for the variable is created. Here's how you can create variables of enum type. enum boolean { false, true }; enum boolean check; ...
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Keywords and Identifiers

C Programming Keywords and Identifiers In this tutorial, you will learn about keywords; reserved words in C programming that are part of the syntax. Also, you will learn about identifiers and proper way to name a variable. Character set Character set is a set of alphabets, letters and some special characters that are valid in C language. Alphabets Uppercase: A B C ................................... X Y Z Lowercase: a b c ...................................... x y z C accepts both lowercase and uppercase alphabets as variables and functions. Digits 0 1 2 3 4 5 6 7 8 9 Special Characters Special Characters in C Programming , < > . _ ( ) ; $ : % [ ] # ? ' & { } " ^ ! * / | - \ ~ + White space Characters blank space, new line, horizontal tab, carriage return and form feed C Keywords Keywords are predefined, reserved words used in programming that have special meanings to the compiler. Keywords are part of the syntax and they ca...
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