Problem with compiling this reallly basic code

**iluvanimestyle** · 09-10-2011

Code:

#include <iostream>
#include <fstream>
#include <cmath>
using namespace std;

int main()
{
    double num1;
    double num2;
    double num3;
    int sum[3] = {num1,num2,num3,};
    int suma = 0;

    cout << "Please enter your three numbers\n" << endl;
    cin >> num1 >> num2 >> num3 >> endl;

    for ( int x = 0; x < 4; x++ ) {
        suma += sum[x];
        cout << suma << endl;
    }
    cin.get();
}

What i want to do is, let the user enter 3 numbers to find the sum of them.

it says error: no matchfor 'operator>>' in '((std::basic_istream<char, std::char_traits<char>... (line15, (the cin >> num1 >> num2 >> num3... line)

what does this mean? and how come my code doesn't work? thanks!

**AndrewHunter** · 09-10-2011

Originally Posted by iluvanimestyle

Code:

    cout << "Please enter your three numbers\n" << endl;
    cin >> num1 >> num2 >> num3 >> endl;

why are you trying to input into std::endl? Additionally, there is no reason to use an array here, a std::vector would be more appropriate.

**grumpy** · 09-10-2011

Originally Posted by iluvanimestyle

Code:

    double num1;
    double num2;
    double num3;
    int sum[3] = {num1,num2,num3,};

You are also completely misinterpreting what this does. It does not make sum[0] an alias for num1. When your code later reads num1, the value of sum[0] will NOT change.

**Elysia** · 09-10-2011

I am going propose a possible solution to your code:

Code:

    int sum[3];
    int suma = 0;

    cout << "Please enter your three numbers\n" << endl;
    cin >> sum[0] >> sum[1] >> sum[2];

Also, this is wrong:
>>for ( int x = 0; x < 4; x++ )
There are not 4 elements, there are 3 elements, so valid range is 0...2, not 0...3 which your loop iterates over.

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