Control Flow Examples

C Programming Decision Making and Loops Examples

You will find necessary examples to create programs containing loops and decision making statements in this article.
C Decision making and loops examples
To understand examples on this page, you should have the knowledge of following topics:
  1. if...else Statement
  2. for Loop
  3. while Loop
  4. break and Continue Statement
  5. switch...case

C Control Flow Examples

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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 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 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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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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C Operators

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C Programming Operators C programming has various operators to perform tasks including arithmetic, conditional and bitwise operations. You will learn about various C operators and how to use them in this tutorial. An operator is a symbol which operates on a value or a variable. For example:  +  is an operator to perform addition. C programming has wide range of operators to perform various operations. For better understanding of operators, these operators can be classified as: Operators in C programming Arithmetic Operators Increment and Decrement Operators Assignment Operators Relational Operators Logical Operators Conditional Operators Bitwise Operators Special Operators C Arithmetic Operators An arithmetic operator performs mathematical operations such as addition, subtraction and multiplication on numerical values (constants and variables). Operator Meaning of Operator + addition or unary plus - subtraction or unary minus * multiplica...
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C Programming Structure Examples

C Programming Structure Examples In this article, you'll find all the necessary examples and source code on structures in C. A structure is a collection of variables of different data types. To understand all examples in this page, you should have knowledge of following structure topics. Structure Introduction Structure and Pointers Passing Structure to Function Example of Structures in C Programming C Programming Examples and Source Code Store Information(name, roll and marks) of a Student Using Structure Add Two Distances (in inch-feet) System Using Structures Add Two Complex Numbers by Passing Structure to a Function Calculate Difference Between Two Time Period Store Information of 10 Students Using Structure Store Information Using Structures for n Elements Dynamically PREVIOUS
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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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C Program to Find the Sum of Natural Numbers using Recursion #38

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C Program to Find the Sum of Natural Numbers using Recursion Example to find the sum of natural numbers by using a recursive function. To understand this example, you should have the knowledge of following C programming topics: C Programming User-defined functions C Programming Recursion The positive numbers 1, 2, 3... are known as natural numbers. The program below takes a positive integer from the user and calculates the sum up to the given number. You can  find the sum of natural numbers using loop  as well. However, you will learn to solve this problem using recursion here. Example: Sum of Natural Numbers Using Recursion #include <stdio.h> int addNumbers ( int n ); int main () { int num ; printf ( "Enter a positive integer: " ); scanf ( "%d" , & num ); printf ( "Sum = %d" , addNumbers ( num )); return 0 ; } int addNumbers ( int n ) { if ( n != 0 ) return n ...
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