switch case used in c++

Prog 9: Write a program to make following output using switch case and for loop.

1) 1/1+1/2+1/3+…………1/n

2) 1/1+1/4+1/9+………….1/n2

3)  Exit

#include<iostream.h>

#include<conio.h>

main()

{

float sum=0.00; 
int i,n,ch; 
clrscr();

cout<<"enter your choice:";

cin>>ch;

switch(ch)

{

case 1:

cout<<"enter the value of n:";

cin>>n;

for(i=1;i<=n;i++)

{

sum=sum+1.00/i;

}

cout<<"sum="<<m;

break;

case 2:

cout<<"enter the value of n:";

cin>>n;

for(i=1;i<=n;i++)

{

sum=sum+1.00/(i*i);

}

cout<<"sum="<<m;

break;

case 3:
return 0;

}

getch();

}

Output:

enter your choice:1 enter the value of n:5 sum=2.283334