Thread: vector to float

Code:

I have done like this.. but still many error..
i have change ti float..then for array.total i change to size.total=0.

rror C2228: left of '.push_back' must have class/struct/union type
F:\460.cpp(37) : error C2228: left of '.clear' must have class/struct/union type
F:\460.cpp(40) : error C2228: left of '.push_back' must have class/struct/union type
F:\460.cpp(53) : error C2228: left of '.size' must have class/struct/union type
F:\460.cpp(56) : error C2228: left of '.total' must have class/struct/union type
F:\460.cpp(57) : error C2228: left of '.at' must have class/struct/union type
Error executing cl.exe.


Help with Code Tags C++ Syntax (Toggle Plain Text) 
#include <iostream>   // std::cout#include <fstream>#include <iomanip>#include <string>    // std::string#include <vector>    // std::vector<>#include <algorithm> //std::for each()using namespace std; // import "std" namespace into global namespace struct exam{int examid;float total;};	int main() 	{	ifstream stream1("STA83SOLUTION.txt");		if ( !stream1.is_open())		{		cout << "While opening a file an error is encountered" << endl;		} 			else 			{			cout << "Fail Di buka....." << endl;			}	vector <exam> exams;	exam aExam;    int tempExamID;    int tempTotal;    stream1 >> tempExamID >> tempTotal;    aExam.examid = tempExamID;    aExam.total.push_back(tempTotal); // add this exam code to current student's vector of exam codes    while (stream1 >> tempExamID >> tempTotal)    {        if(tempExamID != aExam.examid)        {        exams.push_back(aExam); // no more exam codes for this student.  Add aStudent to students vector        aExam.total.clear();        aExam.examid = tempExamID;        }        aExam.total.push_back(tempTotal); // add this exam code to current student's vector of exam codes    }    exams.push_back(aExam); // no more exam codes for this student.  Add aStudent to students vector    stream1.close(); // We have read the entire file, so time to close it.{	ofstream myfile;	myfile.open("411.txt"); 	int temp, flag;	if (myfile.is_open())	{		for (size_t i = 0; i < exams.size(); i++) 		{			for (size_t j = 0; j<exams.at(i).total.size(); j++) 			{ 	size.total = 0;		cout<<"\n"<<i+1<<":"<<" "<< exams.at (i).total.at(j)<<"\t"; // output list of exam codes for this student	  		}		}	} cin.get();return 0;}}#include <iostream>   // std::cout
#include <fstream>
#include <iomanip>
#include <string>    // std::string
#include <vector>    // std::vector<>
#include <algorithm> //std::for each()
using namespace std; // import "std" namespace into global namespace

struct exam
{
int examid;
float total;
};
	int main() 
	{
	ifstream stream1("STA83SOLUTION.txt");
		if ( !stream1.is_open())
		{
		cout << "While opening a file an error is encountered" << endl;
		} 
			else 
			{
			cout << "Fail Di buka....." << endl;
			}
	vector <exam> exams;
	exam aExam;
    int tempExamID;
    int tempTotal;
    stream1 >> tempExamID >> tempTotal;
    aExam.examid = tempExamID;
    aExam.total.push_back(tempTotal); // add this exam code to current student's vector of exam codes
    while (stream1 >> tempExamID >> tempTotal)
    {
        if(tempExamID != aExam.examid)
        {
        exams.push_back(aExam); // no more exam codes for this student.  Add aStudent to students vector
        aExam.total.clear();
        aExam.examid = tempExamID;
        }
        aExam.total.push_back(tempTotal); // add this exam code to current student's vector of exam codes
    }
    exams.push_back(aExam); // no more exam codes for this student.  Add aStudent to students vector
    stream1.close(); // We have read the entire file, so time to close it.
{
	ofstream myfile;
	myfile.open("411.txt");
	
	int temp, flag;
	if (myfile.is_open())
	{
		for (size_t i = 0; i < exams.size(); i++) 
		{
			for (size_t j = 0; j<exams.at(i).total.size(); j++) 
			{

	size.total = 0;
		cout<<"\n"<<i+1<<":"<<" "<< exams.at (i).total.at(j)<<"\t"; // output list of exam codes for this student
	  		}
		}
	}
					
cin.get();
return 0;
}
}

aExam.total.push_back(tempTotal);

What are you doing here?

i have this data

1: 40
2: 30
3:60


and aExam.total.push_back(tempTotal); is to read a data....

before thsi I use vector <int> total, and it succesfully read a data from file..........but I want to change to float to read a data..because after this I want to so a sorting together with
number and total.

like this

3:60
1: 40
2: 30

If you have/want a vector of floats, why are you trying to push_back an int?

Originally Posted by nurulshidanoni

i have this data

1: 40
2: 30
3:60


and aExam.total.push_back(tempTotal); is to read a data....

aExam.total is of type "float". It is a built-in type that has no member functions, like push_back.

Now might be the time to get a good C++ book.