help me figure out error..

[alagumoul]

I am very new to c++.After running the program It showed null error. It asks for both the inputs ie., x1,y1 and x2,y2. But when I press enter for output it returns to the coding screen.

#include<iostream.h>
#include<stdlib.h>
#include<math.h>
int main*(
{
system("cls");
double distance,x1,y1,x2,y2;
cout<<Enter coordinates (x y) for point1:";
cin>>x1>>y1;
cout<<Enter coordinates (x y) for point2:";
cin>>x2>>y2;
distance=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
cout<<"The distance between two points is <<distance<<endl;"
return 0;
}

[Smac89]

Try this:

#include<iostream.h>
#include<stdlib.h>
#include<math.h>
int main*(
{
system("cls");
double distance,x1,y1,x2,y2;
cout<<"Enter coordinates (x y) for point1:";
cin>>x1>>y1;
cout<<"Enter coordinates (x y) for point2:";
cin>>x2>>y2;
distance=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
cout<<"The distance between two points is <<distance<<endl;"
return 0;
}

[LB]

The code still has syntax errors, such as on line 13.

[OxBADC0DE]

Error compiling: Line 5 : Expected '(' before the main body '{'
And oh wait! int main* (?

[alagumoul]

@ Matri X
Its int main()..
thats writting mistake . I am sorry for it

[alagumoul]

@smac89:
I tried that . Output is still not coming it goes to coding page,

[Daleth]

On line 8 from Smac's code, try:

cout << "Enter coordinates (x, y) for point 1: " << std::flush;

[Smac89]

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

#include <iostream> #include<stdlib.h> #include<math.h> int main() { system("cls"); double distance,x1,y1,x2,y2; std::cout<<"Enter coordinates (x y) for point1: "; std::cin>>x1>>y1; std::cout<<"Enter coordinates (x y) for point2: "; std::cin>>x2>>y2; distance=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)); std::cout<<"The distance between two points is " <<distance<<std::endl; return 0; }

The distance between two points is 2.23607

[OxBADC0DE]

@Daleth
Using std::flush with std::cout is really not necessary, std::cout already incorporate the std::flush method, so after every output with it, it automatically flushes the output stream.

[Daleth]

It happened before with some users where std::cout did not flush the buffer as expected.

[TheIdeasMan]

I thought it was std::endl that does the flush?

http://www.cplusplus.com/reference/ostream/endl/

HTH

[OxBADC0DE]

Oops, I admit I was wrong! I had always think it was the std::cout that does the "flushing", I'm sorry for misleading the original writer

[Daleth]

@TheIdeasMan
From what I understand, std::flush only flushes the buffer while std::endl flushes and adds a newline character. In the line where I suggested using std::flush, one wouldn't need to add a newline character.

[Chervil]

Is the actual problem that the console closes before you have a chance to read the output?

http://www.cplusplus.com/forum/beginner/1988/

[Cubbi]

had always think it was the std::cout that does the "flushing",

close, actually, in the code

std::cout<<"Enter coordinates (x y) for point1: ";
std::cin>>x1>>y1;

it's std::cin that does the flushing of std::cout. std::flush would be quite redundant.

when I press enter for output it returns to the coding screen.

Sounds like Chevril's link is the answer.