If we have a string of 7 characters and we can put from 'a' to 'z' in any of these places, write a program which its output is from 'aaaaaaa' to 'zzzzzzz'.

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Tishin · Accepted Answer

Using recursion. Maybe the first thought in our mind is for loop but after second thought I believe is most suitable for this question. Following is my program using C++.
void Str(int str_size, int index, char *str)
{
	if(str_size == index)
	{
		str[index] = '\0';
		cout<

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