Can someone correct this please

[1Ujz3TCk]

hi everyone this is my first post and i need help.i want to check the accountable reading and multiply it with 0.4

#include<iostream.h>
#include<conio.h>
void main()
{clrscr();
int a,b,c,bill,y,z;
cout<<"enter the previous meter reading"<<endl;
cin>>a;
cout<<"enter the current meter reading "<<endl;
cin>>b;
c=b-a;
cout<<"Accountable reading is "<<c<<endl;
{for (int x<=100)
bill=x*0.4;
cout<<bill<<endl;}
getch();}

[Karql]

Mistake is here:

{for (int x<=100)
bill=x*0.4;
cout<<bill<<endl;}

Read about controll statment: http://www.cplusplus.com/doc/tutorial/control.html