added the solution to the problem caesar cipher

Solutions to Known Problems/Caesar Cipher.cpp

@@ -0,0 +1,55 @@
+//https://www.hackerrank.com/challenges/caesar-cipher-1/problem
+#include <bits/stdc++.h>
+
+using namespace std;
+
+string caesarCipher(string s, int k) {
+k=k%26;
+    long int c;
+for(int i=0;s[i];i++)
+{
+    if(s[i]!='`')
+    {
+    c=s[i];
+    if(c<=90 && c>=64)
+    {
+        c+=k;
+        if(c>'Z')
+        c-=26;
+    }
+    else if(c<=122 && c>=96)
+    {
+        c+=k;
+        if(c>'z')
+        c-=26;
+    }
+    s[i]=(char)c;
+    }
+}
+return s;
+
+}
+
+int main()
+{
+    ofstream fout(getenv("OUTPUT_PATH"));
+
+    int n;
+    cin >> n;
+    cin.ignore(numeric_limits<streamsize>::max(), '\n');
+
+    string s;
+    getline(cin, s);
+
+    int k;
+    cin >> k;
+    cin.ignore(numeric_limits<streamsize>::max(), '\n');
+
+    string result = caesarCipher(s, k);
+
+    fout << result << "\n";
+
+    fout.close();
+
+    return 0;
+}