String Handling Programming Exercise 3 in C/C++

What is String in C/C++?

The string can be defined as the combination of characters. String handling is used to manipulate strings such as finding a number of characters in a file or comparing two files. The string is commonly used with file handling.

File is a sequence of bytes. Input and output streams are used to store and retrieve strings in file.

Syntax of String

Data_type var_name[length];

For example

char name[40];

In the above statement, we declare a variable name with a length of 40 characters.

This variable occupies 40 bytes in memory.

One character occupies one byte in memory.

In other words, if we want to store a single character in computer we require one byte.

Exercise Question 3

Write a program that inputs a string and display it in reverse order.

#include<iostream>
#include<string.h>
using namespace std;

main()
{
	char str[100];
	cout<<"Enter a string:";
	cin.getline(str, 100);
	cout<<"Original string:"<<str<<endl;
	cout<<"Reversed string:"<<strrev(str)<<endl;
}

Following Functions are commonly used in String Handling

getline() Function

getline function is used to input a string from user. following is the syntax of this function

getline(string,length);

strcpy() Function

strcpy() function is used to copy a string. Following is the syntax

strcpy(string1,string2);

strrev() Function

This function is used to reverse a string. 

Syntax:

strrev(string);

strcmp() Function

This Function is used to compare two strings.

Syntax:

strcmp(string1,string2);.