Invalid Array Assignment

Question

i don't know where is the problem i'm assigning the address to other 2 dimensional array. Please help me to fix this problem

int main()
{
    int a[3][2];
    int b[2]={0,1};
    a[2]=b;
    return 0;
}

prog.cpp:8:9: error: invalid array assignment

cadaniluk · Accepted Answer · 2015-10-14 06:39:23Z

4

You can't copy an array using =. Neither can you assign an array's address; x = y; doesn't work either when x and y have types char[1] for example. To copy the contents of b to a[2], use memcpy:

memcpy(a[2], b, sizeof(a[2]));

answered Oct 14, 2015 at 6:39

cadaniluk

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Comments

Roushan · Accepted Answer · 2015-10-14 06:45:48Z

2

you should iterate each element of b[2] one by one and store into it a[2] try this:

int main()
{
    int a[3][2];
    int b[2]={0,1};
    for(int i=0;i<2;i++){
     b[i]=a[2];
    return 0;
}

answered Oct 14, 2015 at 6:45

Roushan

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Comments

Zjh · Accepted Answer · 2015-10-14 06:47:08Z

2

Because the standard says so. Arrays cannot be assigned, only initialized. so C:

int i;
for(i = 0; i < 2; i++)
{
  a[2][i] = b[i];
}
...

C++: you can use strcpy!

answered Oct 14, 2015 at 6:47

Zjh

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1 Comment

Zjh Over a year ago

oh, you can use memcpy

Newaz Hossain · Accepted Answer · 2015-10-14 06:43:38Z

0

This assignment is not possible.Array allow specific location assignment. you can try like this:

int main()
{
    int a[3][2];
    int b[2]={0,1};
    a[0][0]=b[0];
    a[0][1]=b[1];
    return 0;
}

answered Oct 14, 2015 at 6:43

Newaz Hossain

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