tolower() Function in C

strlwr() function in C

Last Updated : 04 Oct, 2018

The strlwr( ) function is a built-in function in C and is used to convert a given string into lowercase. Syntax:

char *strlwr(char *str);

Parameter:

str: This represents the given string which we want to convert into lowercase.

Returns: It returns the modified string obtained after converting the characters of the given string str to lowercase. Note: This is a non-standard function that works only with older versions of Microsoft C. Below programs illustrate the strlwr() function in C: Example 1:-

C

// C program to demonstrate
// example of strlwr() function

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

int main()
{
    char str[ ] = "GEEKSFORGEEKS IS THE BEST";

    // converting the given string into lowercase.
    printf("%s\n",strlwr (str));

    return  0;
}

Output:

geeksforgeeks is the best

Example 2:-

c

// C program to demonstrate
// example of strlwr() function.

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

int main()
{
  char str[] = "CompuTer ScienCe PoRTAl fOr geeKS";

  printf("Given string is: %s\n",str);

  printf("\nString after converting to the "
             "lowercase is: %s",strlwr(str));

  return 0;
}

Output:

Given string is: CompuTer ScienCe PoRTAl fOr geeKS

String after converting to the lowercase is: computer science portal for geeks

tolower() Function in C

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