- C++ Programming Examples
- C++ Programming Examples
- C++: Hello World
- C++: Get Input
- C++: Print Integer
- C++: Add two numbers
- C++: Add, Sub, Multiply, Div
- C++: Add Digits
- C++: Find Average and Percentage
- C++: Find Arithmetic Mean
- C++: Sum of n Natural Numbers
- C++: Sum of n Numbers
- C++: Square's Area and Perimeter
- C++: Rectangle's Area and Perimeter
- C++: Triangle's Area and Perimeter
- C++: Area and Circumference
- C++: Find Simple Interest
- C++: Fahrenheit to Celsius
- C++: Celsius to Fahrenheit
- C++: Print Prime Numbers
- C++: Reverse a Number
- C++: Swap Two Numbers
- C++: Print Multiplication Table
- C++: Find Factorial of a Number
- C++: Find Factors of a Number
- C++: Find HCF and LCM
- C++: Create a Calculator
- C++: Count Digits in a Number
- C++: First and Last Digit Sum
- C++: Product of Number Digits
- C++: Sum of Squares of Digits
- C++: Interchange Digits of Number
- C++ if-else Programs
- C++: Check Even or Odd
- C++: Check Prime or Not
- C++: Check Alphabet or Not
- C++: Check Vowel or Not
- C++: Check Leap Year or Not
- C++: Check Reverse equals Original
- C++: Check Perfect Number
- C++: Check Palindrome or Not
- C++: Check Armstrong or Not
- C++: Divisibility Test
- C++: Find Labor Wage
- C++: Find Discounted Price
- C++: Find Shipping Charge
- C++: Find Telephone Bills
- C++: Calculate Student Grade
- C++: Largest of Two Numbers
- C++: Largest of Three Numbers
- C++ Number Conversion
- C++: Decimal to Binary
- C++: Decimal to Octal
- C++: Decimal to Hexadecimal
- C++: Binary to Decimal
- C++: Binary to Octal
- C++: Binary to Hexadecimal
- C++: Octal to Decimal
- C++: Octal to Binary
- C++: Octal to Hexadecimal
- C++: Hexadecimal to Decimal
- C++: Hexadecimal to Binary
- C++: Hexadecimal to Octal
- C++ Pattern Programs
- C++: Pattern Programs
- C++: Print Diamond Pattern
- C++: Print Floyd's Triangle
- C++: Print Pascal's Triangle
- C++ Array Programs
- C++: 1D Array Program
- C++: Linear Search
- C++: Binary Search
- C++: Largest Element in an Array
- C++: Smallest Element in an Array
- C++: Find Second Largest Element
- C++: Find Second Smallest Element
- C++: Sum of All Elements
- C++: Multiply All Elements
- C++: Element in Even Position
- C++: Element in Odd Position
- C++: Print Even Numbers in Array
- C++: Print Odd Numbers in Array
- C++: Count Even or Odd Numbers
- C++: Sum of Even or Odd Numbers
- C++: Count Positive, Negative, Zero
- C++: Reverse an Array
- C++: Insert an Element
- C++: Delete an Element
- C++: Merge two Arrays
- C++: Bubble Sort
- C++: Selection Sort
- C++: Insertion Sort
- C++: Common Elements
- C++: 2D Array Programs
- C++: Add Two Matrices
- C++: Subtract Two Matrices
- C++: Transpose Matrix
- C++: Multiply Two Matrices
- C++: 3D Array Programs
- C++ String Programs
- C++: Print String
- C++: Find String Length
- C++: Compare Two Strings
- C++: Copy String
- C++: String Concatenation
- C++: Reverse a String
- C++: Delete Vowels from a String
- C++: Delete a Word from a String
- C++: Count Characters in a String
- C++: Count Words in a String
- C++: Frequency of Words
- C++: Remove Spaces from Strings
- C++: Sort a String
- C++: Uppercase to Lowercase
- C++: Lowercase to Uppercase
- C++: Swap Two Strings
- C++: Check the Anagram or Not
- C++: Capitalize All Words in a String
- C++: Get Numbers from a String
- C++ File Programs
- C++: Read a File
- C++: Write Content to a File
- C++: Append Data to a File
- C++: Read and Display File
- C++: Copy a File
- C++: Merge Two Files
- Count Characters in a File
- C++: Capitalize Every Word
- C++: List Files in Directory
- C++: Delete a File
- C++: Encrypt and Decrypt a File
- C++ Misc Programs
- C++: Print ASCII Value
- C++: Add Binary Numbers
- C++: Generate Random Numbers
- C++: Print a Smiling Face
- C++: Days into Years and Months
- C++: Add Two Numbers using Pointer
- C++: Print Fibonacci Series
- C++: Generate Armstrong Numbers
- C++: Find nCr and nPr
- C++: Get IP Address
- C++: Print Date and Time
- C++: Shutdown and Restart Computer
- C++ Programming Tutorial
- C++ Tutorial
C++ Program to Read and Display a File's Content
In this article, you will learn and get code to read and display a file's content using a C++ program. But, before we get started, let's make a text file called fresherearth.txt.
Things to Do Before the Program
Since the program given below reads and displays the content of a file entered by the user, As a result, we must create a file called fresherearth.txt that contains the following information:
Hello C++ I'm a File My Name is fresherearth.txt
Save the file with this content inside the current directory. The current directory is the directory where your C++ source code to read and display a file's content is saved. The following is a screenshot of the opened fresherearth.txt file:
And here is the folder, "cpp programs," where the file is saved. In this folder, I'll also save the C++ source code given below to read and display the file's content:
Now, let's write a C++ program to read the contents of the file fresherearth.txt.
Read and Display a File's Content in C++
To read and display a file's content in C++ programming, you have to ask the user to enter the name of the file along with its extension, say, fresherearth.txt.
Now open the file using the open() function. and then read its content in a character-by-character manner. Display the content (character by character) at the time of reading, as shown here in the following program.
The question is: write a program in C++ to read and display the content of a file entered by a user at run-time. Here is its answer:
#include<iostream> #include<fstream> #include<stdio.h> using namespace std; int main() { char fileName[30], ch; fstream fp; cout<<"Enter the Name of File: "; gets(fileName); fp.open(fileName, fstream::in); if(!fp) { cout<<"\nError Occurred!"; return 0; } cout<<"\nContent of "<<fileName<<":-\n"; while(fp>>noskipws>>ch) cout<<ch; fp.close(); cout<<endl; return 0; }
This program was built and runs under the Code::Blocks IDE. Before executing the code, be sure to save this C++ source code in the same folder where you've created or saved your fresherearth.txt file. Here is the initial output produced by this program:
Now supply the name of the newly created file, fresherearth.txt, and press ENTER to read its content and display it as shown in the snapshot given below:
The fstream type variable allows working with files in C++. It is defined in the fstream header file.
The open() function in the preceding program takes one or two arguments.The first argument is "compulsory," which is the filename to be opened.Whereas the second of its arguments is optional, that indicates its opening mode.
The fstream::in file opening mode is used to open the file to read its content only. And the following statement:
fp>>noskipws>>ch
reads data from a file in a character-by-character manner without skipping any white spaces.
You can also use the following block of code to read and display a file's content:
while(!fp.eof()) { fp.get(ch); cout<<ch; }
instead of:
while(fp>>noskipws>>ch) cout<<ch;
But if you still want the complete program, then here it is, with only two extra changes. That is the condition of both the if and while loops:
#include<iostream> #include<fstream> #include<stdio.h> using namespace std; int main() { char fileName[30], ch; fstream fp; cout<<"Enter the Name of File: "; gets(fileName); fp.open(fileName, fstream::in); if(fp==NULL) { cout<<"\nError Occurred!"; return 0; } cout<<"\nContent of "<<fileName<<":-\n"; while(fp.eof()==0) { fp.get(ch); cout<<ch; } fp.close(); cout<<endl; return 0; }
This program does the same job as the previous program. That is, it asks the user to enter the name of any text file to read and display its content on the screen.
The same program in different languages
« Previous Program Next Program »