Question

How to convert a string to lower case (all lower) in C

Answer 1

#include <stdio.h>
#include <ctype.h>

int main(void)
{
    char sentence[50] = "LINUX C Programming";
    int i;

    for(i = 0; sentence[i]; i++)
        sentence[i] = tolower(sentence[i]);

    puts(sentence); // linux c programming
   
    
    return 0;
}

/*
run:

linux c programming

*/

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Answer 2

#include <stdio.h>
#include <ctype.h> 

int main(void)
{
    char arr[] = {"This guest pOst is BY C MAster"};
    char *p = arr;
    
    for ( ; *p; ++p) *p = tolower(*p);
            
    printf("%s\n", arr); // this guest post is by c master
    
    return 0;
}


/*
run:
   
this guest post is by c master

*/

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