Question

How to use tolower() function to convert uppercase letter to lowercase in C

Answer 1

#include <stdio.h>
#include <ctype.h>
  
int main(void)
{
    char s[] = "The Last LINE Of Code";
    int i;
     
    while (s[i])
    {
        putchar(tolower(s[i]));
        i++;
    }
     
    return 0;
}
  
   
/*
     
run:
     
the last line of code
 
*/

 

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Answer 2

#include <stdio.h>
#include <ctype.h>
  
int main(void)
{
    char s[] = "The Last LINE Of Code";
    int i;
     
    while (s[i])
    {
        s[i] = tolower(s[i]);
        i++;
    }
	puts(s);
     
    return 0;
}
  
   
/*
     
run:
     
the last line of code
 
*/

 

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