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In your program the syntax for 'cout' is wrong. Use '<<' operator instead of '>>'. You should provide semicolon at the time of  variable declaration, that is, int s=0; . And you should provide header conio.h , clrscr() and getch() in the program.

conio.h is a header file, declares several useful library functions for performing "console input and output" from a program. clrscr() and getch() are the member functions of conio.h . So if you use both these functions in program, you should include header conio.h .

clrscr() - Clears the screen. So this function helps you to clear the output screen in each execution.

getch() - Reads a character directly from the console without buffer, and without echo. So this function helps you to show answer in the output screen until you press any key on the keyboard.

The correct program as follows:         

            #include<iostream.h>

            #include<conio.h>

            void main()

            {

                        clrscr();

                        int s=0;

                        for(int i=0;i<100;i+=2)

                                    s=s+i;

                        cout<<s;

                        getch();

            }

Output

          2450