Write a C Program to Convert lowercase to uppercase and vice versa

By | 09.11.2016

Convert lowercase to uppercase and vice versa


Write a C Program to Convert lowercase to uppercase and vice versa. Here’s simple C Program to Convert lowercase to uppercase and vice versa in C Programming Language.


C – Strings : 


Strings are actually one-dimensional array of characters terminated by a null character ‘\0’. Thus a null-terminated string contains the characters that comprise the string followed by a null.

String is a sequence of characters. char data type is used to represent one single character in C. So if you want to use a string in your program then you can use an array of characters.

The declaration and definition of the string using an array of chars is similar to declaration and definition of an array of any other data type.

Any string ends with a terminating null character ‘\0’. An array definition in such a way should include null character ‘\0’ as the last element.


Here is source code of the C Program to Convert lowercase to uppercase and vice versa. The C program is successfully compiled and run(on Codeblocks) on a Windows system. The program output is also shown in below.


SOURCE CODE : :


/*  C Program to Convert lowercase to uppercase and vice versa  */

#include<stdio.h>
#include<string.h>

int main()
{
        char str[20];
        int i;
        printf("\nEnter any string :: ");
        gets(str);

        printf("\nThe input String is :: [ %s ]\n",str);
        for(i=0;i<=strlen(str);i++)
    {
                if(str[i]>=97&&str[i]<=122)
                        str[i]=str[i]-32;
                else if(str[i]>=65&&str[i]<=90)
                        str[i]=str[i]+32;
                else;
        }
        printf("\nThe Converted String is :: [ %s ]\n",str);

        return 0;
}

OUTPUT : :


/*  C Program to Convert lowercase to uppercase and vice versa  */

Enter any string :: CodezClub

The input String is :: [ CodezClub ]

The Converted String is :: [ cODEZcLUB ]

Process returned 0

Above is the source code for C Program to Convert lowercase to uppercase and vice versa which is successfully compiled and run on Windows System.The Output of the program is shown above .

If you found any error or any queries related to the above program or any questions or reviews , you wanna to ask from us ,you may Contact Us through our contact Page or you can also comment below in the comment section.We will try our best to reach up to you in short interval.


Thanks for reading the post….

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About Tunde A

My name is Tunde Ajetomobi, a Tech Enthusiast and Growth Hacker. I enjoy creating helpful content that solves problem across different topics. Codezclub is my way of helping young aspiring programmers and students to hone their skills and find solutions on fundamental programming languages.

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living

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codezclub  Post author

Thanks for commenting, We are working on it….

gayatri

why -32 is written

Karan

for ASCII value of ‘a’ is 97 so 97-32=65 & 65 is ASCII value of ‘A’ & you can do this for ‘a’ to ‘z’ to print the lowercase into uppercase.
For print uppercase to lowercase just add 32(+32).

Last edited 2 years ago by Karan
starryeyed

hey, i just wanted to know what (else;) implies?