Merge two Arrays

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//prg to merge arrays  
 //Downloaded From www.c4cpp.co.nr  
 //(C)2009.All rights reserved.  
 #include<iostream.h>  
 #include<conio.h>  
 int c[100],i,j,k;  
 class merged  
 {  
 int na,nb,a[50],b[50];  
 public:  
 void merge();  
 void display();  
 void input();  
 }g;  
 void merged::merge()  
 {  
 int j=0;  
 int i=na-1;  
 while((i>0)&&(j<nb))  
 {  
 if (b[j]<a[i])  
 {  
 c[k]=a[i];  
 i--;  
 k++;  
 }  
 if (b[j]>a[i])  
 {  
 c[k]=b[j];  
 j++;  
 k++;  
 }  
 if (b[j]==a[i])  
 {  
 c[k]=b[j];  
 j++;  
 k++;  
 c[k]=a[i];  
 i--;  
 k++;  
 }  
 }  
 if(i==-1)  
 {  
 while(j<nb)  
 {  
 c[k]=b[j];  
 j++;  
 k++;  
 }  
 }  
 if(j==nb)  
 {  
 while(i>=0)  
 {  
 c[k]=a[i];  
 i--;  
 k++;  
 }  
 }  
 }  
 void merged::display()  
 {  
 for(i=0;i<na+nb;i++)  
 cout<<c[i];  
 }  
 void merged::input()  
 {  
 cout<<"Enter A Lim"<<endl;  
 cin>>na;  
 cout<<"Enter B Limit"<<endl;  
 cin>>nb;  
 cout<<"Enter array A"<<endl;  
 for(i=0;i<na;i++)  
 cin>>a[i];  
 cout<<"Enter Array B"<<endl;  
 for(j=0;j<nb;j++)  
 cin>>b[j];  
 }  
 void main()  
 {  
 clrscr();  
 g.input();  
 g.merge();  
 g.display();  
 getch();  
 }