strlwr() function in C - GeeksforGeeks

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 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 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

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