Urgent help needed for an assignment

[skyfirestalker]

Hey Guys,
Im workin on an assignment to be handed over soon and Im really stuck with identifying sequence, selection and iteration in the following code. Could someone identify these three for me? And a simple explanation of why they are used in this instance would be greatly appreciated.

#include <iostream>
#include <conio.h>
#include<string>

using namespace std;

string nameArray[10]; //to store student names
int markArray[10]; //to store student marks


void ExchangeSort()//sorting the marks in descending order using exchange sort
{
     
	int i, j, ans; 
		string ans2;
     int temp;   // temporary holding variable
     int numLength = 10; 
     
for(int i=0; i<10; i++)
{
for(int j=0; j<10; j++)
{
if(markArray[j]<markArray[j+1])
{
ans=markArray[j+1];
markArray[j+1]=markArray[j];
markArray[j]=ans;
}
{
ans2=nameArray[j+1];
nameArray[j+1]=nameArray[j];
nameArray[j]=ans2;
}
}
}

for(int i=0; i<=10; i++)
{
cout<<markArray[i]<<" - ";
cout<<nameArray[i]<<endl;
}
}

float calculateAverage(){ //averagecalculation
	
	float sum = 0;
	for(int i=0; i<10; i++){
	
		sum = sum + markArray[i]; // add all marks
	}

	float average = sum/10; // calculate average
	cout << "The average mark is : "<< average <<endl;
	return average; 

}

void calculateAboveAverage(){

	float avg = calculateAverage(); // get the average value by calling a function

	for(int j=0; j<10; j++){
	
		if(markArray[j] > avg){ //check what values are greater than average value

			cout << nameArray[j] << " " << markArray[j] << endl;
		}
	
	}

}



void displaynames(){ //to display the names, marks and the grading
	string seek;
	int i,x;
	
	cout<< "Enter a student's name"<<endl;
	cin >> seek;
	for (i=0;i<10;i++){
	if (nameArray[i]==seek){
		
		
		if (markArray[i]>=75 && markArray[i]<=100){
		cout << nameArray[i]<< " "<<markArray[i]<< " D" <<endl;
		}
		if (markArray[i]>=65 && markArray[i]<=74){
			cout << nameArray[i]<< " "<<markArray[i]<< " M" <<endl;
		}
		if (markArray[i]>=40 && markArray[i]<=64){
			cout<< nameArray[i]<< " "<<markArray[i]<< " P" <<endl;
		}
		if (markArray[i]<40){ 
			cout<< nameArray[i]<< " "<<markArray[i]<< " F" <<endl;
		
		}
		
	}
	
	}
	}
	
void main()
{
	int sum = 0;

	cout <<"Student 01"<<endl;
	cout<<"Enter marks:";
	cin >>markArray[0];
	cout<<"Enter Name: ";
	cin >> nameArray[0];

	cout <<"Student 02"<<endl;
	cout<<"Enter marks:";
	cin >>markArray[1];
	cout<<"Enter Name: ";
	cin >> nameArray[1];

	cout <<"Student 03"<<endl;
	cout<<"Enter marks:";
	cin >>markArray[2];
	cout<<"Enter Name: ";
	cin >> nameArray[2];

	cout <<"Student 04"<<endl;
	cout<<"Enter marks:";
	cin >>markArray[3];
	cout<<"Enter Name: ";
	cin >> nameArray[3];
	
	cout <<"Student 05"<<endl;
	cout<<"Enter marks:";
	cin >>markArray[4];
	cout<<"Enter Name: ";
	cin >> nameArray[4];

	cout <<"Student 06"<<endl;
	cout<<"Enter marks:";
	cin >>markArray[5];
	cout<<"Enter Name: ";
	cin >> nameArray[5];

	cout <<"Student 07"<<endl;
	cout<<"Enter marks:";
	cin >>markArray[6];
	cout<<"Enter Name: ";
	cin >> nameArray[6];

	cout <<"Student 08"<<endl;
	cout<<"Enter marks:";
	cin >>markArray[7];
	cout<<"Enter Name: ";
	cin >> nameArray[7];

	cout <<"Student 09"<<endl;
	cout<<"Enter marks:";
	cin >>markArray[8];
	cout<<"Enter Name: ";
	cin >> nameArray[8];

	cout <<"Student 10"<<endl;
	cout<<"Enter marks:";
	cin >>markArray[9];
	cout<<"Enter Name: ";
	cin >> nameArray[9];

	bool flag = true;
	while(flag){

	int option; // storing the option user selected
	float avg;

	cout << "What do you want to do? Please enter a number to choose from the below"<<endl;
	cout << "1. Display the students' marks and corresponding names in descending order" << endl;
	cout << "2. Display the avergae marks" << endl;
	cout << "3. Display the names of students who have marks above the average value" << endl;
	cout << "4. Search for a student" <<endl;

	cin >> option;

	switch(option){
	
	case 1: ExchangeSort();
			break;	
	case 2:
		avg = calculateAverage();
			break;

	case 3: calculateAboveAverage();
			break;

	case 4: displaynames();
			break;

	

	default:flag = false;
		cout<< "Enter a number from 1 to 4"<<endl;

		break;

	}
	}
	_getch();
	}

[goth]

I don't understand what you mean by 'sequence' but I can help you with the last two.

selection: the code starting at line 182 and ending at 203 and any other if...else in your code. It's a "selection" because it selects from several cases (if(condition) <code> else <some_other_code>; and switch being just multiple if...else's)

iteration: to iterate means to go through every element of a structure and either look at it or do some operation on it. The code inside ExchangeSort(), calculateAverage(), calculateAboveAverage() and displaynames() does this.

[skyfirestalker]

@goth, thanks alot for the great help!
selection and iteration are clear enough for me. i simply didnt undrstand wat sequence was either. it was only mentioned in the question. dat doesnt matter.
Thank you very much for your help and time!!!! :)

[Chervil]

Sequence is the most basic of all. It is simply a group of instructions which are executed in a linear fashion, one after another. The flow of control simply steps through the code one line at a time.