tolower() Function in C

The tolower() capability is characterized in the ctype.h header document. In the event that the person passed is a capitalized letter set, the tolower() capability switches capitalized letters in order over completely to lowercase letters in order.

Syntax:

int tolower(int ch);

Essentially tolower() returns an int esteem, and in C language, we can client %c to switch that int esteem over completely to roast worth. However, in c++, pigeonholing is required this way:

char c = (char) tolower(‘A’);

Parameters: This strategy takes a compulsory boundary ch which is the person to be switched over entirely to lowercase.

Return Value: This capability returns the lowercase person compared to the ch.

Example:

// Simple C program to demonstrate the tolower() function 
// example of tolower() function in C.
#include <ctype.h>   //here, we are including the ctype.h module into our program
#include <stdio.h>    //here, we are including the stdio.h module into our program
#include <conio.h>   //here, we are including the conio.h module into our program
int main()
{
    // here, we are giving the input as Characters that are to be converted to the //Lowercase Characters
    char ch = “Vijay”;
    clrscr();   //this function is used to clear the screen before printing the characters
    // here, we are converting the ch data to the lowercase character using toLower() //function
    printf(“Hello World, Welcome to the program”);   //here, we are printing the //simple output statement 
    printf("The given %c in lowercase is represented as = %c", ch, tolower(ch));
    return 0;
}

Output:

Hello world, Welcome to the program.
The given Vijay in lowercase is represented as = vijay

Example 1:

// Simple C program to demonstrate the tolower() function for more than 2 //characters
// Example of tolower() function in C.
#include <ctype.h>   //here, we are including the ctype.h module into our program
#include <stdio.h>    //here, we are including the stdio.h module into our program
#include <conio.h>   //here, we are including the conio.h module into our program
int main()
{
    int j = 0;    //here, we are initializing a integer j assigned to 0
    char st[] = "VIJAY kUMAR\n";
    // the above is the given Character that is to be converted to lowercase
    char ch = 'V';
    clrscr();   //this function is used to clear the screen before printing the characters
    // here, we are converting every character to lowercase
      printf(“Hello World, Welcome to the program”);      //here, we are printing the //simple output statement 
       while (st[j]) {     //here, we are declaring a while loop to convert every single 
// character to the lowercase
        str[j] = tolower(str[j]);
        j++;     //here, we are reading every single character of the word
    }
    // here, we are printing the string that is converted into lowercase
    for (int i = 0; i < j; i++)   //here, we are using the for loop to print every character 
    printf(“Printing the characters in lower case:”);    
    printf("%c", str[i]);     //here, we are printing the characters
    return 0;
}

Output:

Hello World, Welcome to the program
Printing the characters in lowercase: vijay kumar

Note:

Assuming the character passed in the tolower() is any of these three

1. lowercase person

2. unique image

3. digit

tolower() will return the character for what it's worth.

Example 2:

// Simple C program to demonstrate the tolower() function for more than 2 //characters and special characters
// Example of tolower() function in C.
#include <ctype.h>   //here, we are including the ctype.h module into our program
#include <stdio.h>    //here, we are including the stdio.h module into our program
#include <conio.h>   //here, we are including the conio.h module into our program
int main()
{
         int j = 0;     //here, we are initializing a integer j assigned to 0
    char st[] = "ViJay@123\n";     //here, we are initializing the Character st with some //uppercase, lowercase and special characters
    char ch;     //here, we are declaring the character variable ch
    printf(“Hello World, Welcome to the program”);        //here, we are printing the //simple output statement 
    printf(“Printing the characters in lowercase”);
     while (str[j]) {        //here, we are declaring a while loop to convert every single 
// character to the lowercase
        ch = str[j];
        putchar(tolower(ch));      //here, we are converting the uppercase characters to //the lowercase characters
        j++;
    }
    return 0;
}

Output:

Hello World, Welcome to the program.
Printing the characters in lowercase:
vijay@123