int is not a class,struct or union type

[programming killer]

hi everyone. i got a bit problem with executing this following codes..when i compile it come out an error say that "int is not a class,struct or union type",can u all help me to solve it?

#include <iostream>
#include <cmath>
using namespace std;
int distance(int,int);
int main()
{
int a=3;
int b=4;
int ret;
ret=distance(a,b);
cout<<ret;
system("pause");
return 0;
}
void distance(int x,int y)
{
int dist=sqrt(x*x+y*y);
return dist;
return 0;
}

[zb0S216C]

What line does the error occur on?

The prototype:

int distance(int,int);

...does not correspond to the definition:

void distance(int x,int y)

In fact, "distance( )" is a function defined within the "std" name-space. And, by "using namespace std", you will cause a conflict between "std::distance( )" and "::distance( )". I advise that you change the name of your "distance" function.

Also, in your "distance( )" function, the last "return" statement will never be executed because another "return" shadows it.

_Wazzak

[MiiNiPaa]

a) Post line where eror occured
b) There is numerous problems in your code:
1) distance() defined as void, but you are trying to return value from it
2) You are trying to return twice. Why?
3) You have probably run into naming collision with std::distance function

c) there is std::hypot() in <cmath> which does exactly what your function does

[programming killer]

sorry because i edit it many times so it got two return and some careless mistake.. oh.. i get it.. thanks..so can i know more about what is the function of distance()?

[MiiNiPaa]

Basically it is how many elements is between two iterators.
http://en.cppreference.com/w/cpp/iterator/distance

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#include <iostream> #include <iterator> #include <vector> int main() { std::vector<int> v{ 3, 1, 4 }; auto distance = std::distance(v.begin(), v.end()); std::cout << distance << '\n'; }

3

[dhruv90]

1) Conflicting function definition and declaration.
2) Don't return zero from the function.