Hello,
I urgently need help with this program that i wrote. it is an expandable array. it performs different functions as shown below.
I have shown the outputs of the code below.
My problem is with the output of the compLfact(int) function. How do i get rid of the leading zeros.
CODE
#include <iostream>
using namespace std;
void compLfact(int);
// Class Definition
class eArray{
public:
//Constructors
eArray();
eArray(int);
// accessor function to find the state of the object
int getSize();
//Set the elements to some value
void set(int);
void set(int,int);
//get the value of an element
int get(int);
//Print functions
void dump();
void dumpR();
void vMpyC(int);
void aMpyC(int);
//
void expandBy(int);
void trimTo(int);
private:
int size; // Current size
int* data; // Pointer to the array
void init(int);
};
//Class Implementation
eArray::eArray(){
init(4); // default size =4 elements
}
eArray::eArray(int s){
init(s);
}
void eArray::init(int n){
size=n;
data=new int[n];
}
void eArray::set(int v){
for(int i=0; i<size; i++)
data[i]=v;
}
void eArray::set(int index, int val){
if ( index < 0 || index >= size ){
cout<<"Error******"<<endl;
cout<<"Invalid index --- Operation aborted"<<endl;
}
else data[index]=val;
}
int eArray::getSize(){
return size;
}
int eArray::get(int index){
if ( index < 0 || index >= size ){
cout<<"Error******"<<endl;
cout<<"Invalid index --- Operation aborted"<<endl;
return -1;
}
else return data[index];
}
void eArray::dump(){
for(int i=0; i<size; i++)
cout<<data[i]<<" ";
cout<<endl;
}
void eArray::dumpR(){
for(int i=size-1; i>=0; i--)
cout<<data[i]<<" ";
cout<<endl;
}
void eArray::vMpyC(int c){
for(int i=0; i < size; i++)
data[i] *= c;
}
void eArray::aMpyC(int c){
int i,carry,temp;
for(i=size-1,carry=0; i > -1; i--){
temp=data[i]*c + carry;
data[i]= temp%10;
carry=temp/10;
}
}
//This memeber function exapands the size of the
// array by adding n more elements to it.
void eArray::expandBy(int n){
int news=size +n;
int *temp= new int[news]; // create a temp array
int i;
//copy the old data into temp
for(i=0; i<size; i++)
temp[i]=data[i];
//set the newly added elements to zero
for(i=size; i < news; i++)
temp[i]=0;
// we dont need the old data no more
// so we delete them
delete []data;
data=temp; // point data to temp
size= news; // update the size
}
//This function trims the vector by removing
//all but first n components
void eArray::trimTo(int n){
int *temp, i;
if ( n > size){
cout<<"Error in size spec****"<<endl;
cout<<"Operation is aborted"<<endl;
}
else {
temp= new int[n];
//copy the first n guys into temp
for(i=0; i<n; i++)
temp[i]=data[i];
//Now you dont need the old data
delete []data;
//make data points to the temp
data=temp;
size=n; //update size
}
}
void main(){
eArray x(8);
x.set(10);
cout<<x.getSize()<<endl;
cout<<x.get(4)<<endl;
x.set(4,7);
cout<<x.get(4)<<endl;
eArray y;
y.set(5);
y.dump();
int i;
for(i=1; i<5; i++)
y.set(i-1,i);
y.dumpR();
y.vMpyC(10);
y.dump();
eArray z(5);
z.set(0,1);
z.set(1,7);
z.set(2,8);
z.set(3,2);
z.set(4,4);
z.dump();
z.aMpyC(4);
z.dump();
y.expandBy(4);
cout<<y.getSize()<<endl;
y.dump();
y.trimTo(2);
y.dump();
int n;
cout<<"Input n:"; cin>>n;
compLfact(n);
}
void compLfact(int n){
eArray d(20);
int i;
d.set(0);
d.set(19,1);
for (i=2; i<=n; i++)
d.aMpyC(i);
cout<<"The answer is:"<<endl;
d.dump();
}
// the output of the array is:
8
10
7
5 5 5 5
4 3 2 1
10 20 30 40
1 7 8 2 4
7 1 2 9 6
8
10 20 30 40 0 0 0 0
10 20
Input n:6
The answer is:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 2 0
}
My main problem is with the output of the factorial. How do i get rid of all the leading zeros before the number.
instead of 000000......720, i want it to display just 720. I want this to work for any number. Please help me.
*mod edit - added code tags
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