I am have some really weird iostream errors. This is my first time using functions. Maybe I did something completely wrong. I just need someone to point out my error and maybe help with building a function to find the minimum value out of 4 input numbers.

#include <iostream>
using namespace std;

double sum_funk(float n1, float n2, float n3, float n4);
//Calulates sum of the four user inputs.
double pro_funk(float n1, float n2, float n3, float n4);
//Multiplies all of the numbers together.
double max_funk(float n1, float n2, float n3, float n4);
//Determines the maximum number out of the four.
double min_funk(float n1, float n2, float n3, float n4);
//Determines the minimum number out of the four.
double avg_funk(float n1, float n2, float n3, float n4);
//Computes the average value of the four numbers.

int main()
{

float n1,n2,n3,n4,sum,product,max_num,min_num,average;
char quitentry;

cout<< "Welcome!\n";
do
{
cout<< "Please input four numbers with a space\n";
cout<< "between each entry before hitting enter: \n";
cin>> n1>> n2 >> n3 >> n4 >> endl;

sum = sum_funk(n1,n2,n3,n4);

cout.setf(ios::fixed);
cout.setf(ios::showpoint);
cout.precision(2);

cout<< "The sum of the numbers entered is equal to ";
cout<< sum << "." << endl;

product = pro_funk(n1,n2,n3,n4);
cout<< "The product of the numbers entered is equal to ";
cout<< product << "." << endl;

max_num = max_funk(n1,n2,n3,n4);
cout<< "The maximum number entered is ";
cout<< max_num << "." << endl;

min_num = min_funk(n1,n2,n3,n4);
cout<< "The minimum number entered is ";
cout<< min_num << "." << endl;

average = avg_funk(n1,n2,n3,n4);
cout<< "The average of the numbers entered is equal to ";
cout<< average << "." << endl;

cout<< "Would you like to run some new numbers \n";
cout<< "If so press anything key to continue or q to quit.\n";
cin>> quitentry;
if (quitentry == 'q')
cout<< "Have a greeeaaattttttt day tiger!";
}while(quitentry != 'q');


return 0;
}

sum_funk(n1,n2,n3,n4)
//I chose to leave out the functions because it would be too long. But if you need them let me know.

It goes on and on like this for about 50 lines when I try to compile.

error: no match for 'operator>>' in '((std::basic_istream<char>::__istream_type*)((std::basic_istream<char>::__istream_type*)((std::basic_istream<char>::__istream_type*)std::cin.std::basic_istream<_CharT, _Traits>::operator>> [with _CharT = char, _Traits = std::char_traits<char>, std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>](((float&)(& n1))))->std::basic_istream<_CharT, _Traits>::operator>> [with _CharT = char, _Traits = std::char_traits<char>, std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>](((float&)(& n2))))->std::basic_istream<_CharT, _Traits>::operator>> [with _CharT = char, _Traits = std::char_traits<char>, std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>](((float&)(& n3))))->std::basic_istream<_CharT, _Traits>::operator>> [with _CharT = char, _Traits = std::char_traits<char>, std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>](((float&)(& n4))) >> std::endl'
istream:120:7: note: candidates are: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__istream_type& (*)(std::basic_istream<_Char

That helped a lot but for curiosity's sake why can't I have the endl there?

And I have another question; I am given the errors below when I put in all of my functions. What am I doing wrong with the syntax?

sum_funk(n1,n2,n3,n4)
{
double fsum;
fsum = n1 + n2 + n3 + n4;

return fsum;
}

Project 4.cpp:71:9: error: expected constructor, destructor, or type conversion before '(' token
Project 4.cpp:79:9: error: expected constructor, destructor, or type conversion before '(' token

Your function needs a return type.

double sum_funk(n1,n2,n3,n4)
{}

endl is a stream manipulator not a variable.

Edited 6 Years Ago by gerard4143: n/a

Your function needs a return type.

double sum_funk(n1,n2,n3,n4)
{}

endl is a stream manipulator not a variable.

Wouldn't that be like declaring the function twice?

I actually get more errors when I put a data type in front of my functions. Am I not understanding it correctly or is my code faulty to begin with?

error: 'double sum_funk' redeclared as different kind of symbol
11:8: error: previous declaration of 'double sum_funk(float, float, float, float)'
71:17: error: 'n1' was not declared in this scope
71:20: error: 'n2' was not declared in this scope
71:23: error: 'n3' was not declared in this scope
71:26: error: 'n4' was not declared in this scope

Never mind I fixed that issue now I am just having trouble looping it.

Never mind I fixed the loop issue now I just need to determine how to find the max and min value using a function.

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