C++ Array and File Handling (HacktoberFest)

C++/Array/ArrayDemo1.cpp

@@ -0,0 +1,40 @@
+
+
+#include<iostream>
+using namespace std;
+
+int main()
+{
+	// interger array of five elements
+	int marks[5];
+
+	// assigning values
+	cout << "Please enter the marks of student 1 : " ;
+	cin >> marks[0] ;
+
+	cout << "Please enter the marks of student 2 : " ;
+	cin >> marks[1] ;
+
+	cout << "Please enter the marks of student 3 : " ;
+	cin >> marks[2] ;
+
+	cout << "Please enter the marks of student 4 : " ;
+	cin >> marks[3] ;
+
+	cout << "Please enter the marks of student 5 : " ;
+	cin >> marks[4] ;
+
+
+	// accessing array values	
+	cout << "marks[0] :" << marks[0] << endl; 
+	cout << "marks[1] :" << marks[1] << endl; 
+	cout << "marks[2] :" << marks[2] << endl; 
+	cout << "marks[3] :" << marks[3] << endl; 
+	cout << "marks[4] :" << marks[4] << endl; 
+
+
+
+	cout << "size of marks array : " << sizeof(marks) << endl;
+
+	return 0;
+}

C++/Array/ArrayDemo2.cpp

@@ -0,0 +1,30 @@
+
+
+#include<iostream>
+using namespace std;
+
+int main()
+{
+
+	int size;
+	cout << "Please enter the strenght of students in your class : ";
+	cin >> size;
+
+	// interger array of user defined size
+	int marks[size];
+
+	// assigning values
+	for(int i=0; i<size; i++)
+	{
+		cout << "Please enter the marks of Student " << (i+1) << ": ";
+		cin >> marks[i]; 
+	}
+
+	// accessing array values	
+	for(int i=0; i<size; i++)
+	{
+		cout << "marks[" << i << "]: "  << marks[i] << endl;
+	}
+
+	return 0;
+}

C++/Array/ArrayDemo_boundry.cpp

@@ -0,0 +1,41 @@
+
+
+#include<iostream>
+using namespace std;
+
+int main()
+{
+	// interger array of five elements
+	int marks[5];
+
+	// assigning values
+	marks[0] = 85;
+	marks[1] = 85;
+	marks[2] = 85;
+	marks[3] = 85;
+	marks[4] = 85;
+	marks[5] = 85;		// the indexes out of initialization-size
+	marks[6] = 85;
+
+	marks[10] = 85;
+
+
+	// accessing array values	
+	cout << "marks[0] :" << marks[0] << endl; 
+	cout << "marks[1] :" << marks[1] << endl; 
+	cout << "marks[2] :" << marks[2] << endl; 
+	cout << "marks[3] :" << marks[3] << endl; 
+	cout << "marks[4] :" << marks[4] << endl; 
+	cout << "marks[5] :" << marks[5] << endl; 
+	cout << "marks[6] :" << marks[6] << endl; 
+	cout << "marks[7] :" << marks[7] << endl; 
+	cout << "marks[8] :" << marks[8] << endl; 
+	cout << "marks[9] :" << marks[9] << endl; 
+	cout << "marks[10] :" << marks[10] << endl; 
+
+
+
+	cout << "size of marks array : " << sizeof(marks) << endl;
+
+	return 0;
+}

C++/Array/ArrayDemo_boundryCheck.cpp

@@ -0,0 +1,26 @@
+
+
+#include<iostream>
+using namespace std;
+
+int main()
+{	
+	// decalre + initialize
+	int marks[5] = {50, 60, 70, 80, 90 };
+
+	int index;	
+	cout << "Please enter the roll number for which you want to see the marks " ;
+	cin >> index ;
+
+	if (index >=1 && index < 6)		// boundary check
+	{
+		cout << marks[index-1];
+	}
+	else
+	{
+		cout << "Error: You entered wrong roll number... Please try again" << endl;
+	}
+
+
+	return 0;
+}

C++/Array/ArrayDemo_initialization.cpp

@@ -0,0 +1,21 @@
+
+
+#include<iostream>
+using namespace std;
+
+int main()
+{	
+	// decalre + initialize
+	int marks[5] = {50, 60, 70, 80, 90 };
+
+
+	// accessing array values	
+	for(int i=0; i<5; i++)
+	{
+		cout << "marks[" << i << "]: "  << marks[i] << endl;
+	}
+
+
+
+	return 0;
+}

C++/Array/Array_Associativity.cpp

@@ -0,0 +1,25 @@
+
+
+#include<iostream>
+using namespace std;
+
+int main()
+{
+	int marks[5];
+	string name[5];
+
+	for (int i=0; i<5; i++)
+	{
+		cout << "Please enter the name of student : " ;
+		cin >> name[i];
+
+		cout << "Please enter the marks of " << name[i] << " : ";
+		cin >> marks[i];
+
+	}
+
+	for(int i=0; i<5; i++)
+		cout << name[i] << "---" << marks[i] << endl;
+
+	return 0;
+}

C++/Array/Array_Function.cpp

@@ -0,0 +1,51 @@
+
+
+#include<iostream>
+using namespace std;
+
+void printInfo(int[] , int); //prototype
+void modify(int[] , int); //prototype
+
+int main()
+{
+	int size = 5;
+	int marks[size];
+	string name[size];
+
+	for (int i=0; i<size; i++)
+	{
+		cout << "Please enter the name of student : " ;
+		cin >> name[i];
+
+		cout << "Please enter the marks of " << name[i] << " : ";
+		cin >> marks[i];
+	}
+
+	printInfo(marks, size); // by ref
+	modify(marks, size);
+
+	// displaying after modification
+	for(int i=0; i<size; i++)
+		cout << marks[i];
+
+
+	return 0;
+}
+
+
+void printInfo(int val[] , int sz)
+{
+	cout << "The control enters into printInfo() " << endl;
+
+	for(int i=0; i<sz; i++)
+		cout << val[i] << endl;
+}
+
+
+void modify(int val[] , int sz)
+{
+	cout << "The control enters into modify() " << endl;
+
+	for(int i=0; i<sz; i++)
+		val[i] = 100;
+}

C++/Array/Array_Similarity.cpp

@@ -0,0 +1,44 @@
+
+
+#include<iostream>
+using namespace std;
+
+int main()
+{
+	// interger array
+	int number[5] = {10, 20, 30, 40, 50};
+	int data[5] = {10, 20, 30, 40, 60};
+
+	cout << "Address of number : " << number << endl;
+	cout << "Address of data : " << data << endl;
+
+	// Match array references
+	if(number == data)	
+			cout << "The arrays are equal. " << endl;
+	else
+			cout << "The arrays are not equal." << endl;
+
+	// Matching array elements one by one.
+	bool flag = true;
+	int index;
+	for (int i=0; i<5; i++)
+	{
+		if(data[i] != number[i])
+		{
+			flag = false;
+			index = i;
+		}
+	}
+
+	if(flag)
+		cout << "The array elements are equal. " << endl;
+	else
+		{
+		cout << "The array elements are not equal." << endl;
+		cout << "Mismatched index is : " << index << endl;	
+		}
+
+
+
+	return 0;
+}

C++/Array/Array_processing.cpp

@@ -0,0 +1,24 @@
+
+
+#include<iostream>
+using namespace std;
+
+int main()
+{
+	// interger array of five elements
+	int number[5] = {	15, 25, 35, 45, 55 };
+
+
+	int value = number[2]++;
+	cout << value << endl;	// ??? 35?
+
+	for(int var:number)
+		cout << var << endl;
+
+
+	int index = 2;
+	int value1 = number[index++];
+	cout << value1 << endl;	
+
+	return 0;
+}

C++/Array/Array_processing1.cpp

@@ -0,0 +1,28 @@
+
+
+#include<iostream>
+using namespace std;
+
+int main()
+{
+	// interger array of five elements
+	int number[5] = {	15, 25, 35, 45, 55 };
+
+	int sum = 0;		
+	for(int var:number)
+	{
+		sum = sum + var;
+	}	
+	cout << "Sum :" << sum << endl;
+	cout << "Avg :" << sum/5.0 << endl;
+
+	int add=0;
+	for(int i=0; i<=4; i++)
+	{
+		add = add + number[i];
+	}
+	cout << "Add :" << add << endl;
+	cout << "Avg :" << add/5.0 << endl;
+
+	return 0;
+}

C++/Array/Array_processing2.cpp

@@ -0,0 +1,30 @@
+
+
+#include<iostream>
+using namespace std;
+
+int main()
+{
+	// interger array
+	int number[10];
+	int counter = 0; // maintain the counting of properly initialized elements
+
+	//initialize
+	for(int i=0; i<5; i++)
+	{
+		cin >> number[i];
+		counter++;
+	}
+
+
+	cout << "The value of counter : " << counter << endl;
+
+	int sum=0;	
+	for(int i=0; i<counter; i++)
+	{
+		sum = sum +  number[i];
+	}
+		cout << "sum: " << sum << endl;
+
+	return 0;
+}