Error: the expression must be a valid left-hand value to change. What does an error mean?

Question

Error: the expression must be a valid left-hand value to change. What does an error mean?

The program must allocate memory for the square matrix

#include<stdlib.h>
bool WidPam(int** X, int str, int sto) 
{
    if (!(X = (int**)calloc(str, sizeof(int*))))
    {
        printf("Недостаточно памяти\n");
        return false;
    }
    for (int i = 0; i < str;i++) 
    {
        if (!(/*Курсор стал сюда*/(X + i) = (int *)calloc(sto, sizeof(int))))
        {
            printf("Недостаточно памяти\n");
            return false;
        }
    }
    return true;
}

0

c указатели calloc

Author: KoVadim, 2018-10-11

Source

1 answers

score 1 · Accepted Answer

The error means that the X + i on the left side of the assignment is nonsense. What were you trying to achieve with your attempt to assign something to X + i?

The result of the expression X + i is not an lvalue. You can't assign anything to it.