What is wrong in my C++ code

Question

1.00/5 (2 votes)

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I have written a c++ code to solve a problem and getting compilation error for the
13 and 15 line
"1value required as left operand of assignment "

What I have tried:

C++

int k;
int x;
int y;

bool prime_number(int z);
void devisible()
{
    for(int i=2;i<k;i++)>
    {
        if(k%i==0)
        {  prime_number(k)=false;// this is line 13
         break;  }
         else
            prime_number(k)=true;// this is line 15
}
}
int next_prime_number()
{
    for(int k; ; k++)
    {
        if(prime_number(k))
            return k;
        break;
    }

}

Posted 22-Jun-16 18:22pm

Member 12566145

Updated 22-Jun-16 20:18pm

Patrice T

v2

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6 solutions

Solution 3

C#

bool prime_number(int z);

Is a function prototype, not an array.

You need to learn deeper the basics
The C Programming Language - Wikipedia, the free encyclopedia[^]
https://hassanolity.files.wordpress.com/2013/11/the_c_programming_language_2.pdf[^]
http://www.ime.usp.br/~pf/Kernighan-Ritchie/C-Programming-Ebook.pdf[^]

Posted 22-Jun-16 19:24pm

Patrice T

Solution 4

It's not "1value", it's "l-value", where 'l' means "left". This is explained, for example, here: Lvalues and Rvalues (Visual C++).

Doesn't it make sense? :-)

—SA

Posted 22-Jun-16 19:31pm

Sergey Alexandrovich Kryukov

Solution 5

You are using the 'prime_number' like a variable, but it is a function.

C++

 int next_prime_number()
{
    for(int k; ; k++)
    {
        if(prime_number(k)) // This is how it should be used.
            return k;
        break;
    }
 
}

Looking at the code, the function devisible() should be renamed to 'prime_number(int z)',
because the function checks if a given number is prime or not.

Posted 22-Jun-16 20:15pm

Prabu_Anand22

Solution 2

In C-family languages, you denote arrays with brackets [], not with parenthesis ().

Posted 22-Jun-16 18:40pm

phil.o

Solution 6

You must use == for equal-compare operations

Posted 22-Jun-16 20:18pm

casper_mystic@yahoo.com

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Member 12599256 · Accepted Answer · 2016-06-22T18:32:00

Solution 1

C#

bool prime_number(int z);

is a function that return a boolean, and in your code you want to set true/false to that function ?

C#

prime_number(k)=false;

that is not possible.

Posted 22-Jun-16 18:32pm

Member 12599256