C program to convert UPPERCASE string to lowercase!

In this post, let’s see how to get the UPPERCASE string from the user and then convert to a lowercase string with space in C Program.

Let’s write the example C program to convert uppercase string to lowercase.

/*
* Convert uppercase to lowercase in C program
* We need to use tolower() function
* so lets include ctype.h
*/
#include<stdio.h>
#include<ctype.h>
#include<string.h>

int main() {
	
	char inputStr[50], outputStr[50];
	int i;
	
	//get the input from the user including space
	printf("Enter something in CAPS: ");
	scanf("%[^\n]%*c", inputStr);
	
	for(i=0; i < strlen(inputStr); i++) {
		//convert it to lowercase & store it in a variable
		outputStr[i] = tolower(inputStr[i]);
	}
	
	//print the lowercase
	printf("lowercase: %s", outputStr);
}

Sample output of the above example snippet is,

Enter something in CAPS: AGUR CHAND BABU
lowercase: agur chand babu
--------------------------------
Process exited after 4.795 seconds with return value 26
Press any key to continue . . .

I hope this simple C program helps you to convert Uppercase to Lowercase.