interchanging arrays in c

[aphrodite]

How do I interchange two arrays? I tried arr[i]=arr[j] but I get the error: "ISO-C++ forbids assignement of arrays.
Just to mention it, I'm trying to sort an array of strings in ascending order. The array is declared: char arr[20][20] because it's names that I have in it.

[Banfa]

Assuming that the arrays are the same size then your best bet is memcpy

memcpy( arr[i], arr[j], sizeof arr[i]);

[horace1]

How do I interchange two arrays? I tried arr[i]=arr[j] but I get the error: "ISO-C++ forbids assignement of arrays.
Just to mention it, I'm trying to sort an array of strings in ascending order. The array is declared: char arr[20][20] because it's names that I have in it.

in C and C++ the name of an array refers to the address of the first element in memory so you cannot do an assignment

char arr[20][20]={0};
arr[i]=arr[j];
 

you have to copy the elements one at a time, e.g.

    for (int k=0; k<20; k++) arr[i][k]=arr[j][k];
 

or you can use memcpy(), see
http://www.cplusplus.com/reference/c...ng/memcpy.html

[willakawill]

How do I interchange two arrays? I tried arr[i]=arr[j] but I get the error: "ISO-C++ forbids assignement of arrays.
Just to mention it, I'm trying to sort an array of strings in ascending order. The array is declared: char arr[20][20] because it's names that I have in it.

Hi. Perhaps you are asking about swapping 2 elements of the array in a sort

//swap
char arTmp[20];
if (strcmp(ar1[0], ar1[1]) < 0) {
   strcpy(arTmp, ar1[0]);
   strcpy(ar1[0], ar1[1]);
   strcpy(ar1[1], arTmp);
}