- C Programming Examples
- C Programming Examples
- C Print Hello World
- C Get Input from User
- C Print Integer
- C Add Two Numbers
- C Add Subtract Multiply Divide
- C Add n Numbers
- C Area Perimeter of Square
- C Area Perimeter of Rectangle
- C Area Circum of Circle
- C Fahrenheit to Celsius
- C Celsius to Fahrenheit
- C Inches to Centimeters
- C Kilogram to Gram
- C Reverse a Number
- C Swap Two Numbers
- C Interchange Numbers
- C Print ASCII Value
- C Print Fibonacci Series
- C Check Palindrome or Not
- C Check Armstrong or Not
- C Find Armstrong Numbers
- C Find nCr and nPr
- C Find Profit Loss
- C Sum of their Square
- C First & Last Digit Sum
- C Sum of All Digit
- C Product of All Digit
- C Print Total Digit in Number
- C Check Perfect Number
- C Find Basic Gross Salary
- C Round Number to Integer
- C Print Series upto n Term
- C Find Factors of Number
- C if-else & Loop 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 Is Reverse Equal Original
- C Make Calculator
- C Add Digits of Number
- Count Positive Negative Zero
- C Largest of Two Numbers
- C Largest of Three Numbers
- C Smallest of Two Numbers
- C Smallest of Three Numbers
- C Find Factorial of Number
- C Find LCM & HCF
- C Find LCM of n Numbers
- C Find HCF of n Numbers
- C Find Arithmetic Mean
- C Find Average, Percentage
- C Find Student Grade
- C Print Table of Number
- C Print Prime Numbers
- C Find Discount Purchase
- C Calculate Parcel Charge
- C Calculate Wage of Labor
- C Print Phone Bill
- C Conversion programs
- 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 Printing Programs
- C Print Diamond Pattern
- C Print Floyd's Triangle
- C Print Pascal's Triangle
- C Array Programs
- C 1D Array Programs
- C Linear Search
- C Binary Search
- C Largest Element in Array
- C Smallest Element in Array
- C Second Largest/Smallest
- C Count Even Odd
- C Array Element at Even
- C Array Element at Odd
- C Print Even Array Elements
- C Print Odd Array Elements
- C Sum/Product of Even/Odd
- 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 Print Common Elements
- C 2D Array Programs
- C Add Two Matrices
- C Subtract Two Matrices
- C Transpose a Matrix
- C Multiply Two Matrices
- C Sum All Matrix Elements
- C Largest Element in Matrix
- C Print Row Column Total
- C 3D Array Programs
- C String Programs
- C Print String
- C Find Length of String
- C Compare Two String
- C Copy a String
- C Concatenate String
- C Reverse a String
- C Count Vowels Consonants
- C Replace Vowel in String
- C Delete Vowels from String
- C Delete Word from String
- C Frequency of Character
- C Count Word in String
- C Remove Spaces from String
- C Sort a String
- C Sort String in Alphabetical
- C Sort Words in Ascending
- C Sort Words in Descending
- C Uppercase to Lowercase
- C Lowercase to Uppercase
- C Swap Two Strings
- C Check Anagram or Not
- C Check Palindrome String
- C Print Number in Words
- C Print Successive Character
- C Character without Space
- C File Programs
- C Read a File
- C Write Content to File
- C Read & Display File
- C Copy a File
- C Merge Two Files
- C Reverse File
- C Count All Character in File
- C List Files in Directory
- C Encrypt & Decrypt a File
- C Delete a File
- C Misc Programs
- Generate Random Numbers
- C Print Date Time
- C Print Message with Time
- C Get IP Address
- C Print Smiling face
- C Pass Array to Function
- Add Two Numbers using Pointer
- C Address of Variable
- C Shutdown Computer
- C Programming Tutorial
- C Tutorial
C Program to Convert Lowercase to Uppercase
In this article, you will learn and get code for converting any character or string from lowercase to uppercase. Here is the list of programs you will learn about:
- Convert lowercase to uppercase characters.
- Convert a lowercase string to an uppercase string.
- Using a library function, convert a lowercase string to an uppercase string.
But before going to these programs, let's first understand lowercase and uppercase characters, or strings.
Lowercase Character
A character written in small letters is known as a lowercase character. For example, c.
Lowercase String
If each and every character of a string written in small letters is known as a lowercase string. For example, codescracker.
Uppercase Character
A character written in capital letters is known as an uppercase character. For example, C.
Uppercase String
If each and every character of a string is written in capital letter, the string is known as an uppercase string. For example, CODESCRACKER.
All Alphabets' ASCII Value
ASCII values of A-Z (uppercase alphabets) are 65-90. That is, the ASCII value of
- A is 65
- B is 66
- C is 67
- and so on.
Letters a-z (lowercase alphabets) have ASCII values 97-122. That is, the ASCII value of
- a is 97
- b is 98
- c is 99
- and so on.
Lowercase to Uppercase Formula
As you can see, the ASCII values of lowercase and uppercase alphabets are given above. The lowercase alphabet's ASCII value, say, "a," is 32 greater than the uppercase alphabet's ASCII value, say, "A." So to convert lowercase to uppercase, use the formula
upperChar = lowerChar-32
Where lowerChar is the character entered by the user (in lowercase). For example, if lowerChar contains a, then using the above formula
upperChar = lowerChar-32 =a-32 =97-32 =65
And 65 is the ASCII value of A. Therefore, the given lowercase character a gets converted into an uppercase character A. To apply the conversion to a string, convert each and every character using the above formula. Now let's move on to the program given below:
Lowercase to Uppercase Character in C
Let's first create a program that converts lowercase characters to uppercase characters. So the question is: write a program in C that asks the user to enter a character (in lowercase) and converts it to uppercase. The answer to this question is given below:
#include<stdio.h> #include<conio.h> int main() { char lowerChar, upperChar; int ascii; printf("Enter a lowercase Character: "); scanf("%c", &lowerChar); ascii = lowerChar; upperChar = ascii-32; printf("\nIts Uppercase = %c", upperChar); getch(); return 0; }
This program was built and runs under the Code::Blocks IDE. Here is the sample run:
Now supply any character (in lowercase) as input, say "c," and press the ENTER key to see the following output:
Lowercase string to uppercase in C
The question is: write a program in C that converts any given string from lowercase to uppercase. The answer to this question is given below:
#include<stdio.h> #include<conio.h> int main() { char lowerString[50]="", upperString[50]=""; int i=0; printf("Enter a lowercase String: "); gets(lowerString); while(lowerString[i]!='\0') { upperString[i] = lowerString[i]-32; i++; } printf("\nIts Uppercase = %s", upperString); getch(); return 0; }
The snapshot given below shows the sample run of this program:
As you can see from the above program, each and every character gets converted into its equivalent value in uppercase inside the while loop. After converting, just print the value of upperString as output.
Using a Library Function to convert a lowercase string to an uppercase string in C
This is the end of this article. This program uses the standard library function strupr(), which takes a string as an argument and returns the string given in the argument in its uppercase form. Let's have a look at the program:
#include<stdio.h> #include<conio.h> #include<string.h> int main() { char str[100]; printf("Enter lowercase String: "); gets(str); printf("\nIts Uppercase = %s", strupr(str)); getch(); return 0; }
The output produced by this program is the same as that of the previous program.
The same program in different languages
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