[Error] expected unqualified-id before '{' token

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C++

#include <iostream>
#include <math.h>
using namespace std;

float calculateSD(float data[]);



	{
	int a[20],i,limit;
	
	cout << "Enter the limit of sample :" << endl;
	
	cin >> limit;
	
	cout << "Enter the sample :" << endl;
	
	for (i = 0; i < limit ; ++i)
	
   	{cin >> data [ i ];}
	
    cout << endl << "Standard Deviation = " << calculateSD(data);

    return 0;
	}

float calculateSD(float data[])
{
    float sum = 0.0, mean, standardDeviation = 0.0;

    int i;

    for(i = 0; i < limit; ++i)
    {
        sum += data[i];
    }

    mean = sum/limit;

    for(i = 0; i < 10; ++i)
        standardDeviation += pow(data[i] - mean, 2);

    return sqrt(standardDeviation / limit);
}

What I have tried:

Can anyone help me with this? I dont understand why it come up with an error. What im trying to do is output a mean of sample, variance and standard deviation from input data. Im suck at this.

Posted 12-Jan-21 21:05pm

Member 15044680

Updated 31-May-21 23:26pm

CPallini

v2

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2 solutions

Solution 2

To add to what CPallini says, start by looking at the error message - it tells you exactly where it found the problem:
main.cpp:9:1: error: expected unqualified-id before ‘{’ token
{
^

That says the file name is "main.cpp", the line number it found a problem on is "9", the column was "1" and the "^" is pointing to the character it found a problem with.
So go to that line (most editors support CTRL+G to go directly to a line number) and look at a few line above that for context.

C++

float calculateSD(float data[]);



	{

What's above it? The function declaration.
So think about what might be wrong with the line above that could cause a problem later.
Semicolon terminates a statement - so the spurious one at the end of the function declaration is making it a forward declaration - a definition of the function signature with a promise "to fill in the body later".

It's honestly a lot, lot quicker to think about syntax errors and fix them yourself than it is to ask about them! :D

Posted 12-Jan-21 21:24pm

OriginalGriff

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CPallini · Accepted Answer · 2021-01-12T21:09:00

Solution 1

Quote:
float calculateSD(float data[]); //<--- Spurious semicolon here, remove it

{

Posted 12-Jan-21 21:09pm

CPallini