chore(CPlusPlus): display longest name (#517)

algorithms/CPlusPlus/README.md

@@ -101,6 +101,7 @@
 6. [Remove occurrences from string](Strings/remove-occurrences.cpp)
 7. [Delete alternate characters in a string](Strings/delete-alternate-characters.cpp)
 8. [Print first letter of every word](Strings/print-first-letter.cpp)
+9. [Display longest name in a string array](Strings/longest-name.cpp)
 
 ## Trees
 

algorithms/CPlusPlus/Strings/longest-name.cpp

@@ -0,0 +1,46 @@
+/*
+Description: Given a list of names, display the longest name.
+
+Approach: To use length() method for every array element
+Keeping the index of maximum length string in max variable
+
+Time Complexity: O(n)
+*/
+
+#include <iostream>
+
+using namespace std;
+//function starts
+string longest(string names[], int n) { //storing the index of max-length string
+  int max = 0;
+
+  for (int i = 1; i < n; i++) {
+    if (names[i].length() > names[max].length()) {
+      max = i;
+    }
+  }
+  //returning the string at max index   
+  return names[max];
+}
+
+//main starts  
+int main() {
+  //names array
+  string names[] = {
+    "hi",
+    "hello",
+    "helloall",
+    "helloeveryone"
+  };
+  //calculating size of the array
+  int n = sizeof(names) / sizeof(names[0]);
+  cout << "The longest string in the array is: " << longest(names, n);
+  return 0;
+}
+
+/*
+names=["hi","hello","helloall","helloeveryone"]
+
+Output: 
+The longest string in the array is: helloeveryone
+*/