Function in depth

FunctionInDepth.cpp

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+//functions in depth
+//why func are important 
+//how to declare functions
+//how to call a function
+//scope of a variables
+//function calll by value
+//function call y refrence
+//default parameter value 
+#include<iostream>
+#include<cmath>
+using namespace std;
+int GlobalVariable=20; 	//these are accesable in all place f program
+int squareNumber(int n)		//find the sqaue of n natural number
+{
+	return n*n;
+}
+double area(int radius)		//Area 
+{
+	return 3.14 * (radius*radius);
+}
+double circumstance(int radius)	
+{	//Area of ircumstance
+	return 2*3.14*(radius);
+}
+void EligibilityVote(int age)			//chek eligibility of the vote
+{
+	if (age>18)
+	{
+		cout<<"Yes you can vote"<<endl;
+	}
+	else
+	{
+		cout<<"Sorry you cant.."<<endl;
+	}
+}
+int CheckOdd(int num)		//odd nummber between two pints
+{
+	if (num%2 !=0)
+	{
+		return num;
+	}
+
+}
+bool checkPrime(int num)		//check the prime nmber between two point
+{
+	for (int i=2;i<=sqrt(num);i++)
+	{
+		if (num%i==0)
+		{
+			return false;
+		}
+	}
+	return true;
+
+}
+int main()			//Main function
+{
+	for (int i =1;i<= 5;i++)
+	{
+		cout<<squareNumber(i)<<" ";
+	}
+	cout<<endl;
+	int val=3;			//loal variable which canot acess outide fromthe function
+	double result=area(val);
+	float result_=circumstance(val);
+	cout<<"The area of result is:"<<result<<endl;
+	cout<<"The circumstance of result is:"<<result_<<endl;
+	int age=19;
+	EligibilityVote(age);
+	int num1=1;
+	int num2=10;
+	for (int i=num1;i<=num2;i++)
+	{
+		cout<<CheckOdd(i)<<endl;
+	}
+	cout<<endl;
+	cout<<endl;
+	int prime1=2;
+	int prime2=40;
+	for (int i=prime1;i<=prime2;i++)
+	{
+		if (checkPrime(i))
+		{
+			cout<<i<<" ";
+		}
+	}
+}

day11.cpp

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+#include<iostream>
+using namespae std;
+int main()
+{