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  1. Caesar Cipher
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Caesar Cipher

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  • sandeepbhandari4
     + 0 comments
    def caesarCipher(s, k):
    # Write your code here

    k = k - ((k//26) * 26)    # normalising the K
    cipher = ""
    for i in range(len(s)):
        if 64 < ord(s[i]) < 91 :
            val = ord(s[i]) + k if (ord(s[i]) + k) < 91 else 64 + (ord(s[i]) + k) - 90
            cipher = cipher + chr(val)
        elif 96 < ord(s[i]) < 123 :
            val = ord(s[i]) + k if (ord(s[i]) + k) < 123 else 96 + (ord(s[i]) + k) - 122
            cipher = cipher + chr(val)
        else :
            val = ord(s[i])
            cipher = cipher + chr(val)   
    return cipher

  • salman_hooshmand
     + 0 comments
    def caesarCipher(s, k):
    res=""
    for i in range(len(s)):
        small, ch = check('a','z', s, i, k)
        if not small:
            big, ch = check('A', 'Z', s, i, k)
        res+=ch
    return res

def check(start, end, s, i,  k):
    n = ord(end)-ord(start)+1
    ch = s[i]
    if ord(start) <= ord(ch) <= ord(end):
        i = ord(ch) - ord(start)
        new_i = (i + k) % n
        return True, chr(ord(start) + new_i)
    return False, ch

  • revant_a_natesan
     + 0 comments

    Simplified Java Solution Method:

    public static String caesarCipher(String s, int k) {
    // Write your code here
        String cipher = "";
        k%=26;
                
        for(char c : s.toCharArray()){
            if(Character.isLetter(c)){
                if((Character.isUpperCase(c)&&(c+k)>90)||(Character.isLowerCase(c)&&(c+k)>122)){
                     c-=26;                  
                }
                c+=k;
            }
            cipher+=c;   
        }
        return cipher;
    }

  • azraf_akarakin
     + 0 comments

    def caesarCipher(s, k): # Write your code here k %= 26 cyphStr = "" lAlph = "abcdefghijklmnopqrstuvwxyz" uAlph = lAlph.upper()

    lAlph = lAlph[k:] + lAlph[:k]
uAlph = uAlph[k:] + uAlph[:k]

for c in s:
    if 'a' <= c <= 'z':
        charASCII = (ord(c) - ord('a'))%26
        cyphStr += lAlph[charASCII]
    elif 'A' <= c <= 'Z':
        charASCII = (ord(c) - ord('A'))%26
        cyphStr += uAlph[charASCII]
    else:
        cyphStr += c


return cyphStr

  • allannastin
     + 0 comments

    If you are failing 3 cases you need to consider if the uppercase letters went into lowercase letters.