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// 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; 
} 
 

prog.c: In function ‘main’:
prog.c:13:19: warning: implicit declaration of function ‘strlwr’; did you mean ‘strlen’? [-Wimplicit-function-declaration]
     printf("%s\n",strlwr (str));
                   ^~~~~~
                   strlen
prog.c:13:14: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘int’ [-Wformat=]
     printf("%s\n",strlwr (str));
             ~^    ~~~~~~~~~~~~
             %d
/usr/bin/ld: /home/bE7C8t/cct7B6Ar.o: in function `main':
prog.c:(.text.startup+0x3f): undefined reference to `strlwr'
collect2: error: ld returned 1 exit status

Standard output is empty