Happy Codings - Programming Code Examples
Html Css Web Design Sample Codes CPlusPlus Programming Sample Codes JavaScript Programming Sample Codes C Programming Sample Codes CSharp Programming Sample Codes Java Programming Sample Codes Php Programming Sample Codes Visual Basic Programming Sample Codes

C++ Programming Code Examples

C++ > Sorting Searching Code Examples

C++ Program to Compare Binary and Sequential Search

/* C++ Program to Compare Binary and Sequential Search - Implement both binary and sequential search. - The time complexity of Binary search is O(log(n)). - The time complexity of Linear search is O(n). - Implement the binary search and count the number of iteration to compute the result. - Implement the linear search and count the number of iteration to compute the result. - Compare the number of iteration and show the better algorithm. - Exit. */ #include<iostream> using namespace std; // A function implementing Binary search on a sorted array. int BinarySearch(int a[], int start, int end, int item, int iter) { int i, mid; // Every time this function called, counted as a iteration of binary search. cout<<"\niteration "<<iter+1; iter++; // Assigning middle of the array. mid = start + (end-start+1)/2; // If value is less than value at start index more than end index then item is not in the array. if(item > a[end] || item < a[start] || mid == end) { cout<<"\nNot found"; return iter; } // Return if item found at mid index. else if(item == a[mid]) { cout<<"\n item found at "<<mid<<" index."; return iter; } // Return if item found at start index. else if(item == a[start]) { cout<<"\n item found at "<<start<<" index."; return iter; } // Return if item found at end index. else if(item == a[end]) { cout<<"\n item found at "<<end<<" index."; return iter; } // According to the item value choose the partion to proceed further. else if(item > a[mid]) BinarySearch(a, mid, 19, item, iter); else BinarySearch(a, start, mid, item, iter); } // A function implementing Binary search on a sorted array. int LinearSearch(int a[], int n, int item) { int i; for(i = 0; i < n; i++) { cout<<"\niteration "<<i+1; // Directly comparing the item with the array element sequentially. if(a[i] == item) { cout<<"\n item found at "<<i<<" index."; // Returning the number of iteration taken place. return i+1; } } cout<<"\nNot found"; } int main() { int n, i, Biter, Liter, a[20]={1, 9, 16, 24, 28, 35, 39, 43, 49, 53, 55, 66, 67, 73, 75, 77, 83, 89, 96, 97}; cout<<"\nEnter the element to be searched: "; cin>>n; cout<<"\n\n\t\t\tBinary Search :"; cout<<"\n\t\t\t*************"; Biter = BinarySearch(a, 0, 19, n, 0); cout<<"\n\n\t\t\tLinear Search :"; cout<<"\n\t\t\t*************"; Liter = LinearSearch(a, 20, n); // Comparing the number of iteration and printing the better approach for this search. if(Liter > Biter) cout<<"\n\nBinary search is better for this search."; else if(Liter < Biter) cout<<"\n\nLinear search is better for this search."; else cout<<"\n\nBoth are equally efficient for this search."; return 0; }

The if...else statement executes two different codes depending upon whether the test expression is true or false. Sometimes, a choice has to be made from more than 2 possibilities. The if...else ladder allows you to check between multiple test expressions and execute different statements. In C/C++ if-else-if ladder helps user decide from among multiple options. The C/C++ if statements are executed from the top down. As soon as one of the conditions controlling the if is true, the statement associated with that if is executed, and the rest of the C else-if ladder is bypassed. If none of the conditions is true, then the final else statement will be executed.

A program shall contain a global function named main, which is the designated start of the program in hosted environment. main() function is the entry point of any C++ program. It is the point at which execution of program is started. When a C++ program is executed, the execution control goes directly to the main() function. Every C++ program have a main() function.

The cin object is used to accept input from the standard input device i.e. keyboard. It is defined in the iostream header file. C++ cin statement is the instance of the class istream and is used to read input from the standard input device which is usually a keyboard. The extraction operator(>>) is used along with the object cin for reading inputs. The extraction operator extracts the data from the object cin which is entered using the keyboard. The "c" in cin refers to "character" and "in" means "input". Hence cin means "character input". The cin object is used along with the extraction operator >> in order to receive a stream of characters.

A relational operator is used to check the relationship between two operands. C++ Relational Operators are used to relate or compare given operands. Relational operations are like checking if two operands are equal or not equal, greater or lesser, etc. Relational Operators are also called Comparison Operators.

Logical Operators are used to compare and connect two or more expressions or variables, such that the value of the expression is completely dependent on the original expression or value or variable. We use logical operators to check whether an expression is true or false. If the expression is true, it returns 1 whereas if the expression is false, it returns 0. Assume variable A holds 1 and variable B holds 0:

In computer programming, we use the if statement to run a block code only when a certain condition is met. An if statement can be followed by an optional else statement, which executes when the boolean expression is false. There are three forms of if...else statements in C++: • if statement, • if...else statement, • if...else if...else statement, The if statement evaluates the condition inside the parentheses ( ). If the condition evaluates to true, the code inside the body of if is executed. If the condition evaluates to false, the code inside the body of if is skipped.

In computer programming, loops are used to repeat a block of code. For example, when you are displaying number from 1 to 100 you may want set the value of a variable to 1 and display it 100 times, increasing its value by 1 on each loop iteration. When you know exactly how many times you want to loop through a block of code, use the for loop instead of a while loop. A for loop is a repetition control structure that allows you to efficiently write a loop that needs to execute a specific number of times.

Search range for subsequence. Searches the range [first1,last1) for the first occurrence of the sequence defined by [first2,last2), and returns an iterator to its first element, or last1 if no occurrences are found. The elements in both ranges are compared sequentially using operator== (or pred, in version (2)): A subsequence of [first1,last1) is considered a match only when this is true for all the elements of [first2,last2). This function returns the first of such occurrences. For an algorithm that returns the last instead, see find_end. The function shall not modify any of its arguments.

Consider a situation, when we have two persons with the same name, jhon, in the same class. Whenever we need to differentiate them definitely we would have to use some additional information along with their name, like either the area, if they live in different area or their mother's or father's name, etc. Same situation can arise in your C++ applications. For example, you might be writing some code that has a function called xyz() and there is another library available which is also having same function xyz(). Now the compiler has no way of knowing which version of xyz() function you are referring to within your code.

#include is a way of including a standard or user-defined file in the program and is mostly written at the beginning of any C/C++ program. This directive is read by the preprocessor and orders it to insert the content of a user-defined or system header file into the following program. These files are mainly imported from an outside source into the current program. The process of importing such files that might be system-defined or user-defined is known as File Inclusion. This type of preprocessor directive tells the compiler to include a file in the source code program.

The cout is a predefined object of ostream class. It is connected with the standard output device, which is usually a display screen. The cout is used in conjunction with stream insertion operator (<<) to display the output on a console. On most program environments, the standard output by default is the screen, and the C++ stream object defined to access it is cout. The "c" in cout refers to "character" and "out" means "output". Hence cout means "character output". The cout object is used along with the insertion operator << in order to display a stream of characters.

An array is defined as the collection of similar type of data items stored at contiguous memory locations. Arrays are the derived data type in C++ programming language which can store the primitive type of data such as int, char, double, float, etc. It also has the capability to store the collection of derived data types, such as pointers, structure, etc. The array is the simplest data structure where each data element can be randomly accessed by using its index number. C++ array is beneficial if you have to store similar elements. For example, if we want to store the marks of a student in 6 subjects, then we don't need to define different variables for the marks in the different subject. Instead of that, we can define an array which can store the marks in each subject at the contiguous memory locations.

Compute natural logarithm. Returns the natural logarithm of x. The natural logarithm is the base-e logarithm: the inverse of the natural exponential function (exp). For common (base-10) logarithms, see log10. The C/C++ library function double log(double x) returns the natural logarithm (base-e logarithm) of x. Function returns natural logarithm of x. If x is negative, it causes a domain error. If x is zero, it may cause a pole error (depending on the library implementation).

To check the number is a "prime number" or not a prime number in C++, enter a number and 'start checking' for prime number. If the number is divisible by 2 to one less than that

Lets see a sample without break statement, then we will discuss switch case with break 'Switch Case' statement is mostly used with 'break statement' even though the break is