Reverse a String eg: I am a boy ans : boy a am I

Question

Reverse a String eg: I am a boy  ans : boy a am I

Manoj Mohan · Accepted Answer

int
main()
{
char s[] = "I am a boy";
char a[20][20];
int i=0;
char *result = strtok(s, " ");
if (result)
    strcpy(a[i++], result);

while (result != NULL)
    {
    result = strtok(NULL, " ");
    if (result)
        strcpy(a[i++], result);
    }

while (i != -1)
    printf("%s ", a[--i]);
return 0;
}

Tim · Answer

Here is an idea:

char *reverse_words(char *string)
{
	char *duplicate = strdup(string);
	int length = strlen(duplicate);
	int last_non_whitespace_index = 0;
	int word_length = 0;

	for(int i = 0; i < length; i++)
	{
		if (i < length / 2)
			swap_char(duplicate, i, length - 1 - i);
		
		if(duplicate[i] == ' ')
		{
			word_length = i - last_non_whitespace_index;
			for(int j = 0; j < word_length / 2; j++)
			{
				swap_char(duplicate, last_non_whitespace_index + j, i - 1 - j);
			}

			last_non_whitespace_index = i + 1;
		}
	}
	
	return duplicate;
}

Reverse a string with recursion C# · Answer

public static string reverseString(string str)
		{
			if(str == null)
			{
				return null;
			}
			
			else if(str.Length < 2)
			{
				return str;
			}

			return reverseString(str.Substring(1)) + str[0];
		}

Sigiloso · Answer

RUBY

a = "I am a boy"

b = a.split(" ")

len = b.length

for i in 1..len
    print "#{b[-i]} "
end

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