C Program to Convert Uppercase to Lowercase and Vice Versa in a string1 min read

In this tutorial, we will learn to write a C program to convert uppercase to lowercase and vice versa. Before that, you may go through the following topic in C.

C Program to Convert Uppercase String to Lowercase String

Explanation: The program asks the user to enter a string. The string can be fully uppercase or partially uppercase. The program converts that string to a fully uppercase string.

We have used for loop to iterate through the string and also, we know that a is equal to 97 and A is equal to 65 (97-32).

Output:

`Enter the string: sIMpLe2CoDEConversion to Lower Case String: simple2code`

C Program to Convert Lowercase String to Uppercase String

Explanation: The program asks the user to enter a string. The string can be fully lowercase or partially lowercase. The program converts that string to a fully lowercase string.

We have used for loop to iterate through the string and also, we know that A is equal to 65 and a is equal to 97 (65+32).

Output:

`Enter the string: simPle2Code.comConversion to Uppercase String: SIMPLE2CODE.COM`

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