Incompatible Pointer Type for Array in C

Question

I'm getting the error:

lab9q4.c:72:15: warning: passing argument 
1 of 'ReadSalaries' from incompatible 
pointer type [-Wincompatible-pointer-types]
ReadSalaries(&salaries, size);
           ^~~~~~~~~
lab9q4.c:20:26: note: expected 'float **' 
but argument is of type 'float (*) [(sizetype)size]'
void ReadSalaries(float *salaries[], int size)

Here's my code:

float ReadSalary(int num)
{
    int salary;
    printf("Enter Salary %d: ", num);
    scanf(" %d", &salary);
    return(salary);
}

void ReadSalaries(float *salaries[], int size) 
{
    for (int i = 0; i > size; i++)
    {
        *salaries[i] = ReadSalary((i + 1));
    }
}

int main() 
{
    const int size = 10;
    float salaries[size];

    ReadSalaries(&salaries, size);
}

It's a good question, but has been answered 100 times. When you take the address of salaries the type is float (*)[size] not float ** (just as your compiler is telling you). C11 Standard - 6.3.2.1 Other Operands - Lvalues, arrays, and function designators(p3) (note the exceptions... particularly the "..the unary & operator.." part.) Also note if you remove the '&' you have a simple float * pointer at your disposal. — David C. Rankin
– David C. Rankin, Commented May 12, 2020 at 3:27

Massimo · Accepted Answer · 2020-05-13 14:00:00Z

2

void ReadSalaries(float *salaries, int size) 
{
    for (int i = 0; i > size; i++)
    {
        salaries[i] = ReadSalary((i + 1));
    }
}

And in the main

ReadSalaries(&salaries[0], size);

You want to change the elements, not the array, so it is safe to pass a simple pointer.

edited May 13, 2020 at 14:00

answered May 12, 2020 at 3:28

Massimo

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