With the above code i meant to view all the prime numbers from 1 - 1000. It gives the right output , thats okeys. The only thing I don't understand is the parse error it gives when i do the following changes to the above code,Code:#include<iostream> #include<conio.h> using std::cout; using std::cin; using std::endl; // function prototype void prime(void); int main() { // display prime numbers prime(); getch(); } // definition of prime() void prime(void) { // declare alias int num; for( num=1; num<=1000; num+=2 ) { cout<< num<<endl; } }

instead of prime();

i write the following

cout<< prime();

or

cout<<prime(void);

in both of the above cases it gives a parse error before token')'. I dont understand this. Last but not the least when i only change prime(); to prime(void); with no cout<< at the beginning it gives me all the prime numbers from 403 - 999 but not from 1-999 y is this so? Can anyone explain this logic.