Question

How to implement the tolower() function to converts character to lowercase in C

Answer 1

#include <stdio.h>

int my_tolower(int c);

int main(void)
{
    int i = 0;
    char str[] = "ABCD";
	
    while( str[i] ) 
    {
      str[i] = my_tolower(str[i]);
      i++;
    }
    puts(str);

    return 0;
}

int my_tolower(int c) 
{ 
    if (c >= 'A' && c <= 'Z') 
        return c + 'a' - 'A'; 
    else 
        return c; 
} 

  
/*
  
run:
  
abcd

*/

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