human
Can you provide a code to largest number with prime digits and the other steps required given the following:
Largest number with prime digits | check if character is prime.
replace with previous prime character.
if 2 erase s [ i ] and replace next with 7.
find first non prime char.
find first char greater than 2.
like 20.
like 7721.
replace remaining with 7.
Driver code"
Solution in Python:
assistant
#Here is code to largest number with prime digits and the other steps required.
 def isPrime ( c ) :
	return ( c == '2' or c == '3' or c == '5' or c == '7' )
def decrease ( s , i ) :
	if ( s [ i ] <= '2' ) :
		s . pop ( i )
		s [ i ] = '7'
	elif ( s [ i ] == '3' ) :
		s [ i ] = '2'
	elif ( s [ i ] <= '5' ) :
		s [ i ] = '3'
	elif ( s [ i ] <= '7' ) :
		s [ i ] = '5'
	else :
		s [ i ] = '7'
def primeDigits ( s ) :
	s = [ i for i in s ]
	i = 0
	while i < len ( s ) :
		if ( isPrime ( s [ i ] ) == False ) :
			while ( s [ i ] <= '2' and i >= 0 ) :
				i -= 1
			if ( i < 0 ) :
				i = 0
				decrease ( s , i )
			else :
				decrease ( s , i )
			for j in range ( i + 1 , len ( s ) ) :
				s [ j ] = '7'
			break
		i += 1
	return " " . join ( s )
s = "45"
print ( primeDigits ( s ) )
s = "1000"
print ( primeDigits ( s ) )
s = "7721"
print ( primeDigits ( s ) )
s = "7221"
print ( primeDigits ( s ) )
s = "74545678912345689748593275897894708927680"
print ( primeDigits ( s ) )