It's giving me expected initializer before 'struct' as an error. What should I do?

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C++

#include  <bits/stdc++.h>
#include <vector>
using namespace std; 

#define N 11
struct Activity 
{
  int start, finish; 
}; 	
bool Sort_activity(Activity s1, Activity s2) 
{ 
return (s1.start< s2.start);

} 


 
void print_Max_Activities(Activity arr[], int n) 
{ 
	sort(arr, arr+n, Sort_activity); 

	cout<< "Following activities are selected \n"; 
    int i = 0; 
	cout<< "(" <<arr[i].start<< ", " <<arr[i].finish << ")\n";
 for (int j = 1; j < n; j++) 
    { 
	   if (arr[j].start>= arr[i].finish) 
      	{	 
cout<< "(" <<arr[j].start<< ", "<<arr[j].finish << ") \n"; 
			i = j;
			 
			
	}   } 
} int main() 

   struct Activities =
    {
        {1, 4}, {3, 5}, {0, 6}, {5, 7}, {3, 8}, {5, 9},
        {6, 10}, {8, 11}, {8, 12}, {2, 13}, {12, 14}
    };
{ 
    Activity arr[N];
   
	for(int i=0; i<=N-1; i++)
	{
cout<<"Enter the start and end time of "<<i+1<<" activity \n";
		cin>>arr[i].start>>arr[i].finish;
}
print_Max_Activities(arr, N); 
 return 0; 
}

What I have tried:

I've tried just declaring struct, but I still just get the same error.

Posted 26-Jan-22 20:56pm

Jason Edmund

Updated 27-Jan-22 5:18am

Sean Ewington

v2

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_Asif_ · Answer 1 · 2022-01-26T21:43:00

You have compilation errors, which i have fixed, however the code is ambiguous.

C++

#include  <bits/stdc++.h>
#include <vector>
using namespace std; 

#define N 11
struct Activity 
{
  int start, finish; 
}; 	

bool Sort_activity(Activity s1, Activity s2) 
{ 
return (s1.start< s2.start);

} 


void print_Max_Activities(Activity arr[], int n) 
{ 
	sort(arr, arr+n, Sort_activity); 

	cout<< "Following activities are selected \n"; 
    int i = 0; 
	cout<< "(" <<arr[i].start<< ", " <<arr[i].finish << ")\n";
    for (int j = 1; j < n; j++) 
    { 
	   if (arr[j].start>= arr[i].finish) 
       {	 
            cout<< "(" <<arr[j].start<< ", "<<arr[j].finish << ") \n"; 
			i = j;
	   }   
    } 
} 

int main() 
{
   Activity Activities[11] =
    {
        {1, 4}, {3, 5}, {0, 6}, {5, 7}, {3, 8}, {5, 9},
        {6, 10}, {8, 11}, {8, 12}, {2, 13}, {12, 14}
    };

    Activity arr[N];
   
	for(int i=0; i<=N-1; i++)
	{
        cout<<"Enter the start and end time of "<<i+1<<" activity \n";
		cin>>arr[i].start>>arr[i].finish;
    }
    print_Max_Activities(arr, N); 
    return 0; 
}

CPallini · Answer 2 · 2022-01-26T23:50:00

It is difficult to figure out what you are trying to do.
I'm showing you a piece of working code (using a vector which header you included but not used)

C++

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

struct Activity
{
  int start, finish;
};


ostream  & operator << ( ostream & os, const Activity & a)
{
  os << "start = " << a.start << ", finish = " << a.finish;
  return os;
}

bool compare_activity(Activity s1, Activity s2)
{
  return (s1.start < s2.start);
}

void print_Max_Activities(vector<Activity> & va)
{
  sort(va.begin(), va.end(), compare_activity);

  cout << "ordered activities\n";

  for (auto & a : va )
  {
    cout << a << "\n";
  }
}
int main()
{
   vector <Activity> va {
        {1, 4}, {3, 5}, {0, 6}, {5, 7}, {3, 8}, {5, 9},
        {6, 10}, {8, 11}, {8, 12}, {2, 13}, {12, 14}
    };

  print_Max_Activities(va);
}

OriginalGriff · Answer 3 · 2022-01-26T21:44:00

Look at your code:

} int main() 

   struct Activities =
    {
        {1, 4}, {3, 5}, {0, 6}, {5, 7}, {3, 8}, {5, 9},
        {6, 10}, {8, 11}, {8, 12}, {2, 13}, {12, 14}
    };
{ 
    Activity arr[N];

You can't declare anything between the function signature for main and the function body!
Move this:

int main()

below the definition:

}

   struct Activities =
    {
        {1, 4}, {3, 5}, {0, 6}, {5, 7}, {3, 8}, {5, 9},
        {6, 10}, {8, 11}, {8, 12}, {2, 13}, {12, 14}
    };
int main() 
{ 
    Activity arr[N];

That will get rid of the problem, but will cause another error since neither the compiler or I have any idea what the struct Activities = ... is supposed to be ...

It's giving me expected initializer before 'struct' as an error. What should I do?

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