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C++ Program to swap two numbers without third variableWe can swap two numbers without using third variable. There are two common ways to swap two numbers without using third variable:
Program 1: Using * and /Let's see a simple C++ example to swap two numbers without using third variable. #include <iostream> using namespace std; int main() { int a=5, b=10; cout<<"Before swap a= "<<a<<" b= "<<b<<endl; a=a*b; //a=50 (5*10) b=a/b; //b=5 (50/10) a=a/b; //a=10 (50/5) cout<<"After swap a= "<<a<<" b= "<<b<<endl; return 0; } Output: Before swap a= 5 b= 10 After swap a= 10 b= 5 Program 2: Using + and -Let's see another example to swap two numbers using + and -. #include <iostream> using namespace std; int main() { int a=5, b=10; cout<<"Before swap a= "<<a<<" b= "<<b<<endl; a=a+b; //a=15 (5+10) b=a-b; //b=5 (15-10) a=a-b; //a=10 (15-5) cout<<"After swap a= "<<a<<" b= "<<b<<endl; return 0; } Output: Before swap a= 5 b= 10 After swap a= 10 b= 5
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