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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 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 Program to Convert Binary Number to Decimal and vice-versa #39

C Program to Convert Binary Number to Decimal and vice-versa In this example, you will learn to convert binary number to decimal and decimal number to binary manually by creating a user-defined function. To understand this example, you should have the knowledge of following C programming topics: C Programming Functions C Programming User-defined functions Visit this page to learn how to convert the binary number to decimal. Example 1: Program to convert binary number to decimal #include <stdio.h> #include <math.h> int convertBinaryToDecimal ( long long n ); int main () { long long n ; printf ( "Enter a binary number: " ); scanf ( "%lld" , & n ); printf ( "%lld in binary = %d in decimal" , n , convertBinaryToDecimal ( n )); return 0 ; } int convertBinaryToDecimal ( long long n ) { int decimalNumber = 0 , i = 0 , remainder ; while ( n != 0 ) { ...
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C Programming Structure and Pointer

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C Programming Structure and Pointer In this article, you'll find relevant examples that will help you to work with pointers to access data within a structure. Structures can be created and accessed using pointers. A pointer variable of a structure can be created as below: struct name { member1; member2; . . }; int main() { struct name *ptr; } Here, the pointer variable of type  struct name  is created. Accessing structure's member through pointer A structure's member can be accesssed through pointer in two ways: Referencing pointer to another address to access memory Using dynamic memory allocation 1. Referencing pointer to another address to access the memory Consider an example to access structure's member through pointer. #include <stdio.h> typedef struct person { int age ; float weight ; }; int main () { struct person * personPtr , person1 ; personPtr = & person1 ; ...
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C program to Reverse a Sentence Using Recursion #43

C program to Reverse a Sentence Using Recursion This program takes a sentence from user and reverses that sentence using recursion. This program does not use string to reverse the sentence or store the sentence. To understand this example, you should have the knowledge of following C programming topics: C Programming Functions C Programming User-defined functions C Programming Recursion Example: Reverse a sentence using recursion /* Example to reverse a sentence entered by user without using strings. */ #include <stdio.h> void reverseSentence (); int main () { printf ( "Enter a sentence: " ); reverseSentence (); return 0 ; } void reverseSentence () { char c ; scanf ( "%c" , & c ); if ( c != '\n' ) { reverseSentence (); printf ( "%c" , c ); } } Output Enter a sentence: margorp emosewa awesome program This program first p...
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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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