- 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 Count Characters, Words, and Lines in a File
This article provides some programs in C++ that count and print the total number of characters, words, lines, vowels, etc. in a file. The file's name must be entered by the user at run-time. This article deals with these programs:
- Count the total number of characters in a file
- Count the total number of words in a file
- Count the total number of lines in a file
- Count the total number of blank spaces in a file
- Count the total number of vowels and consonants in a file
What Should You Do Before the Program?
Since the program given below operates on a file. Therefore, a file must be available or created inside the current directory (the folder where the C++ program's source code is saved). I haven't created a file, so let me create a file called fresherearth.txt. Here is a snapshot of the folder where this file was created and saved right now:
Now put some content inside this file so that the program given below counts all the things like characters, words, lines, vowels, consonants, blank spaces, etc. available in the file. Here is a snapshot of the opened file, fresherearth.txt, after writing or adding some content:
Now let's move on and create a program in C++ that counts characters, words, lines, etc. from this file using the program.
Count the Number of Characters in a File
The question is, "Write a program in C++ that receives the name of a file from the user at run-time to count and print the total number of characters available in the file." The answer to this question is the program given below:
#include<iostream> #include<fstream> using namespace std; int main() { char filename[30], ch; int tot=0; ifstream fp; cout<<"Enter the Name of File: "; cin>>filename; fp.open(filename, ifstream::in); if(!fp) { cout<<endl<<"File doesn't exist or Access denied!"; return 0; } while(fp>>noskipws>>ch) tot++; fp.close(); cout<<endl<<"Total Characters = "<<tot; cout<<endl; return 0; }
The snapshot given below shows the initial output produced by the above C++ program on counting the total number of characters available in a text file:
Now enter the name of the file, say fresherearth.txt (the file created earlier), and press the ENTER key to count and print the total number of characters as shown in the snapshot given below:
Note: The noskipws is used in between the file pointer fp and the character variable ch while scanning or getting the character, so as to extract and initialize all the things (i.e., the whole content of the file), including tab spaces, blank spaces, newlines, etc.
Count the Number of Words in a File
This program counts and prints the total number of words available in a file entered by the user. Except for the counting part, the majority of the code will be the same as in the previous program. Let's have a look at the program given below:
#include<iostream> #include<fstream> using namespace std; int main() { char filename[30], ch, str[1000]; int tot=0, i=0, tot_word=0; ifstream fp; cout<<"Enter the Name of File: "; cin>>filename; fp.open(filename, ifstream::in); if(!fp) { cout<<endl<<"File doesn't exist or Access denied!"; return 0; } while(fp>>noskipws>>ch) { str[tot] = ch; tot++; } fp.close(); str[tot]='\0'; while(str[i]!='\0') { if(str[i]=='\n') { if(str[i+1]!='\0' && str[i+1]!=' ') tot_word++; i++; } else if(str[i]!=' ') i++; else { if(str[i+1]!='\0' && str[i+1]!=' ') tot_word++; i++; } } cout<<endl<<"Total Words = "<<tot_word; cout<<endl; return 0; }
Here is its sample run with the same user input, which is fresherearth.txt as the name of the file:
In the above program, the statement:
str[tot]='\0';
is used to end the initialization of a character in string str with a null character ('0'). And the following block of code:
while(str[i]!='\0') { if(str[i]=='\n') { if(str[i+1]!='\0' && str[i+1]!=' ') tot_word++; i++; } else if(str[i]!=' ') i++; else { if(str[i+1]!='\0' && str[i+1]!=' ') tot_word++; i++; } }
is responsible for counting the total number of words available in the string str. This string contains all the content of the file. Therefore, indirectly, the code is used to count the total number of words in the file. In this block of code, the code:
while(str[i]!='\0')
states that the loop will continue to execute until a null-terminated character ('\0') is encountered. And the code:
if(str[i+1]!='\0' && str[i+1]!=' ')
states that the condition evaluates to be true only if the character at i+1th index is not equal to a null terminated character and also not equal to a blank space.
Count the number of lines in a file
This is, I think, the simplest one of all the programs given here. The only extra thing we've got to do in this program is only compare the character at the current index with \n and increment the variable responsible for the counting of newlines or the number of lines available in the file, like shown in the program given below:
#include<iostream> #include<fstream> using namespace std; int main() { char filename[30], ch, str[1000]; int tot=0, i=0, tot_lines=0; ifstream fp; cout<<"Enter the Name of File: "; cin>>filename; fp.open(filename, ifstream::in); if(!fp) { cout<<endl<<"File doesn't exist or Access denied!"; return 0; } while(fp>>noskipws>>ch) { str[tot] = ch; tot++; } fp.close(); str[tot]='\0'; while(str[i]!='\0') { if(str[i]=='\n') tot_lines++; i++; } tot_lines++; cout<<endl<<"Total Number of Lines = "<<tot_lines; cout<<endl; return 0; }
Here's a sample run with user input fresherearth.txt to count and print the total number of lines in this file, as shown in the screenshot below:
Total number of blank spaces in the file
This program is as simple as the previous program. Here also, we only have to compare each character with ' ' a blank space, one by one, as shown in the program given here:
#include<iostream> #include<fstream> using namespace std; int main() { char filename[30], ch, str[1000]; int tot=0, i=0, tot_blanks=0; ifstream fp; cout<<"Enter the Name of File: "; cin>>filename; fp.open(filename, ifstream::in); if(!fp) { cout<<endl<<"File doesn't exist or Access denied!"; return 0; } while(fp>>noskipws>>ch) { str[tot] = ch; tot++; } fp.close(); str[tot]='\0'; while(str[i]!='\0') { if(str[i]==' ') tot_blanks++; i++; } cout<<endl<<"Total Number of Blank Spaces = "<<tot_blanks; cout<<endl; return 0; }
Here is a snapshot of the sample run with the same user input as the previous program, which is fresherearth.txt:
Count vowels and consonants in the file
This is the final program in this article, and it counts and prints the total number of vowels and consonants in a text file:
#include<iostream> #include<fstream> using namespace std; int main() { char filename[30], ch, str[1000]; int tot=0, i=0, vowels=0, consonants=0, ascii; ifstream fp; cout<<"Enter the Name of File: "; cin>>filename; fp.open(filename, ifstream::in); if(!fp) { cout<<endl<<"File doesn't exist or Access denied!"; return 0; } while(fp>>noskipws>>ch) { str[tot] = ch; tot++; } fp.close(); str[tot]='\0'; while(str[i]!='\0') { if(str[i]=='a'||str[i]=='e'||str[i]=='i'||str[i]=='o'||str[i]=='u') vowels++; else if(str[i]=='A'||str[i]=='E'||str[i]=='I'||str[i]=='O'||str[i]=='U') vowels++; else { ascii = str[i]; if(ascii>=65 && ascii<=90) consonants++; else if(ascii>=97 && ascii<=122) consonants++; } i++; } cout<<endl<<"Total Number of Vowels = "<<vowels; cout<<endl<<"Total Number of Consonants = "<<consonants; cout<<endl; return 0; }
The snapshot given below shows a sample run of the above program on counting the total number of vowels and consonants in a text file entered by the user at run-time:
The above program is created in such a way that first I've checked whether the character is a vowel or not. If not, then using the else block, the character gets initialized to a variable of type int that assigns the ASCII equivalent of the character, and using the ASCII value, I've done the thing.
Note that the ASCII values for letters A-Z are 65–90 and for letters a–z are 97–122, respectively.
You can also replace the following block of code from the above program:
else { ascii = str[i]; if(ascii>=65 && ascii<=90) consonants++; else if(ascii>=97 && ascii<=122) consonants++; }
with the block of code given below:
else { if(str[i]>='A' && str[i]<='Z') consonants++; else if(str[i]>='a' && str[i]<='z') consonants++; }
The results will be the same. I've provided both variety and context to ensure that you have a thorough understanding of the subject.
« Previous Program Next Program »