Added code to Swap two numbers without third variable #60

Code to Swap Two Numbers without using third variable

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+/*  C++ Program to Swap Two Numbers without using third variable  */
+
+#include <iostream>
+using namespace std;
+
+int main()
+{
+
+    int a,b ;
+
+    cout<<"Enter 1st number :: ";
+    cin>>a;
+    cout<<"\nEnter 2nd number :: ";
+    cin>>b;
+
+    cout << "\nBefore swapping, Numbers are :: " << endl;
+    cout << "\n\ta = " << a << ", b = " << b << endl;
+
+    a = a + b;
+    b = a - b;
+    a = a - b;
+
+    cout << "\nAfter swapping, Numbers are :: " << endl;
+    cout << "\n\ta = " << a << ", b = " << b << endl;
+
+    return 0;
+}

Sorting names in an alphabetical order.cpp

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+#include <bits/stdc++.h>
+using namespace std;
+
+//function to print the array
+void print(vector<string> names){
+	printf("printing ........\n");
+	for(int i=0;i<names.size();i++)
+		cout<<names[i]<<endl;
+	printf("\n");
+}
+
+bool mycomp(string a, string b){
+	//returns 1 if string a is alphabetically 
+	//less than string b
+	//quite similar to strcmp operation
+	return a<b;
+}
+
+vector<string> alphabaticallySort(vector<string> a){
+	int n=a.size();
+	//mycomp function is the defined function which 
+	//sorts the strings in alphabatical order
+	sort(a.begin(),a.end(),mycomp);
+	return a;
+}
+
+int main()
+{   
+	int n;
+	printf("enter number of names to be added: ");
+	scanf("%d",&n);
+
+	//creating a vector of strings
+	//vector to store strings(names)
+	vector<string> names;
+	string name;
+	printf("enter names: \n");
+	//taking input
+	for(int i=0;i<n;i++){
+		cin>>name;
+		//insert names into the vector
+		names.push_back(name); 
+	}
+
+	printf("\nbefore sorting\n");
+	print(names);
+
+	//function to sort names alphabetically
+	names=alphabaticallySort(names);
+
+	printf("after alphabetical sorting\n");
+	print(names);
+
+	return 0;
+}