- C++ Programming Examples
- C++ Programming Examples
- C++ Hello World
- C++ Get Input
- C++ Print Integer
- C++ Add Two Numbers
- C++ Add Sub Mul Div
- C++ Add Digits
- C++ Find Average Perc
- C++ Find Arithmetic Mean
- C++ Sum of n Natural Numbers
- C++ Sum of n Numbers
- C++ Area Perimeter of Square
- C++ Area Perimeter of Rectangle
- C++ Area Perimeter of Triangle
- C++ Area Circum of Circle
- 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 Number
- C++ Find Factors of Number
- C++ Find HCF & LCM
- C++ Make Calculator
- C++ Count Digits in Number
- C++ Sum of First & Last Digit
- C++ Product of Digits of Number
- 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
- Check Reverse equal Original
- C++ Check Perfect Number
- C++ Check Palindrome or Not
- C++ Check Armstrong or Not
- C++ Divisibility Test
- C++ Find Wage of Labor
- 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
- Find Largest Element in Array
- Find Smallest Element in Array
- Find Second Largest Element
- Find Second Smallest Element
- C++ Sum of All Elements
- C++ Multiply All Elements
- C++ Element on Even Position
- C++ Element on Odd Position
- C++ Print Even Numbers in Array
- C++ Print Odd Numbers in Array
- C++ Count Even/Odd Numbers
- C++ Sum of Even/Odd Numbers
- C++ Count Positive Negative Zero
- C++ Reverse an Array
- C++ Insert Element in Array
- C++ Delete Element from Array
- 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 Length of String
- C++ Compare Two Strings
- C++ Copy String
- C++ Concatenate String
- C++ Reverse a String
- C++ Delete Vowels from String
- C++ Delete Word from String
- C++ Count Character in String
- C++ Count Word in String
- C++ Frequency of Word
- C++ Remove Spaces from String
- C++ Sort a String
- C++ Uppercase to Lowercase
- C++ Lowercase to Uppercase
- C++ Swap Two Strings
- C++ Check Anagram or Not
- C++ Capitalize All Words in String
- C++ Capitalize Specific Character
- C++ Get Numbers from String
- C++ File Programs
- C++ Read a File
- C++ Write Content to File
- C++ Append Data in File
- C++ Read & Display File
- C++ Copy a File
- C++ Merge Two Files
- Count Characters, Words in File
- C++ Capitalize All Words in File
- C++ List Files in Directory
- C++ Delete a File
- C++ Encrypt & Decrypt a File
- C++ Misc Programs
- C++ Print ASCII Value
- C++ Add Binary Numbers
- C++ Generate Random Numbers
- C++ Print Smiling Face
- C++ Days into Years, Months
- Add Two Numbers using Pointer
- C++ Print Fibonacci Series
- Generate Armstrong Numbers
- C++ Find nCr and nPr
- C++ Get IP Address
- C++ Print Date/Time
- C++ Shutdown, Restart Computer
- C++ Programming Tutorial
- C++ Tutorial
- C++ Programming Test
- C++ Programming Test
- Give Online Test
- All Test List
C++ Program to Convert Uppercase to Lowercase
In this article, you will learn and get code on uppercase character/string to lowercase conversion in C++. The program is created with and without using standard library (or string) function. Here are the list of programs:
- Uppercase Character to Lowercase without using string function
- Program to deal with an invalid input
- Uppercase String to Lowercase without using string function
- Uppercase character/string to lowercase using string function, strlwr()
Uppercase Character
An uppercase character is basically an alphabet character written in capital letter. For example, C. ASCII values of all 26 uppercase alphabet characters are 65-90. Where 65 is the ASCII value of A, 66 is the ASCII value of B, and so on upto, 90 is the ASCII value of Z
Lowercase Character
A lowercase character is basically an alphabet character written in small letter. For example, c. ASCII values of all 26 lowercase alphabet characters are 97-122. That is, a→97, b→98, c→99, and so on.
Uppercase and Lowercase String
If all the characters available in a string are in uppercase, then it is called as uppercase string. And if all the characters of a string are written in lowercase, then it is called as lowercase string.
Note - String is a combination of more than one character. For example, CODESCRACKER (an uppercase string) or codescracker (a lowercase string)
Uppercase to Lowercase Formula
Since ASCII value of A (capital letter) is 65 and ASCII value of a (small letter) is 97. The difference between them is 32. Therefore, on adding 32 to the ASCII value of capital letter say A, then we'll get the ASCII value of its equivalent letter in lowercase. That is,:
65 (ASCII value of A) + 32 = 97 (ASCII value of a)
C++ Uppercase Character to Lowercase
To convert a character from uppercase to lowercase in C++ programming, you have to ask from user to enter a character in uppercase and then convert it into its equivalent lowercase character. Finally print the equivalent character in lowercase on output.
#include<iostream> using namespace std; int main() { char chUpper, chLower; int ascii; cout<<"Enter the Character (in Uppercase): "; cin>>chUpper; ascii = chUpper; ascii = ascii+32; chLower = ascii; cout<<"\nIts Lowercase: "<<chLower; cout<<endl; return 0; }
This program was build and run under Code::Blocks IDE. Here is its sample run:
Now supply the character input in uppercase say C and press ENTER
key to print its equivalent
character in lowercase as shown in the output given below:
In above program, when user enters C as an uppercase character input, then it gets stored in chUpper variable. So the statement given below:
ascii = chUpper;
Initializes the ASCII value of C to ascii. So, ascii = 67. Now the statement:
ascii = ascii+32;
initializes 67+32 or 99 to ascii. So the new value of ascii is 99, which is the ASCII value of c (lowercase). So the statement:
chLower = ascii;
Since, chLower is of char (character) type variable, therefore the character corrensponds to 99 (ASCII value) gets initialized to chLower. So chLower=c. Now print the value of chLower as output.
How to deal with an Invalid Input ?
If user enters an invalid input like an alphabet character that is already in lowercase or any other character like numbers, or special character, then follow the program given below. Previous program does not work correctly in this case.
#include<iostream> using namespace std; int main() { char chUpper, chLower; int ascii; cout<<"Enter the Character: "; cin>>chUpper; if(chUpper>='A' && chUpper<='Z') { ascii = chUpper; ascii = ascii+32; chLower = ascii; cout<<"\nIts Lowercase: "<<chLower; } else if(chUpper>='a' && chUpper<='z') cout<<"\nAlready in Lowercase"; else cout<<"\nInvalid Input!"; cout<<endl; return 0; }
Here is its sample run with user input D
Below is another sample run with user input d (already in lowercase):
And here is the final sample with user input 4 (not an alphabet):
C++ Uppercase String to Lowercase
Now let's convert string from uppercase to lowercase. The following C++ program asks from user to enter a string say CODESCRACKER (in uppercase) to change and print it into lowercase:
#include<iostream> #include<stdio.h> using namespace std; int main() { char strUpper[50]="", strLower[50]=""; int i=0, ascii, chk=0; cout<<"Enter the String: "; gets(strUpper); while(strUpper[i]!='\0') { if(strUpper[i]>='A' && strUpper[i]<='Z') { ascii = strUpper[i]; ascii = ascii+32; strLower[i] = ascii; chk++; } else strLower[i] = strUpper[i]; i++; } strLower[i]='\0'; if(chk==0) cout<<"\nString is already in Lowercase"; else cout<<"\nLowercase of String: "<<strLower; cout<<endl; return 0; }
Here is its sample run with string input as This is CodesCracker:
C++ Uppercase to Lowercase using Function
The question is, write a program in C++ that converts uppercase character or string to lowercase using string function. The answer to this question is given below:
#include<iostream> #include<stdio.h> #include<string.h> using namespace std; int main() { char str[50]; int len; cout<<"Enter the Character/String: "; gets(str); len = strlen(str); if(len==1) cout<<"\nLowercase of Given Character: "<<strlwr(str); else cout<<"\nLowercase of Given String: "<<strlwr(str); cout<<endl; return 0; }
Here is its sample run with string input CODESCRACKER:
Same Program in Other Languages
« Previous Program Next Program »