String matrix input output

Question

I want to make a matrix of strings in C Programming language this is my code

void main()
{
    char Data[10][3][20];
    int i=0;
    int j=0;
    for (i=0;i<10;i++)
    {
        for (j=0;j<3;j++)
        {
            Data[i][j]="aa";
        }
    }
    for (i=0;i<10;i++)
    {
        for (j=0;j<3;j++)
        {

            printf("%s",Data[i][j]);
        }
    }
    printf("Done");
    scanf("%d",&i);
}

the error am having is : assignment to expression with array type please explain to me what am doing wrong because this is a prototype am trying to use in my original code that is to make a data base of "username,Password,level"

thank you inadvance.

And what have you done? Please provide a [mcve] of your problem. — David Glickman, Mar 03 '17 at 09:44
`Data[i][j]` is an *array*. You can't assign to an array, only copy to it. Read about [`strcpy`](http://en.cppreference.com/w/c/string/byte/strcpy). — Some programmer dude, Mar 03 '17 at 09:46
And for future reference, *please* [read about how to ask good questions](http://stackoverflow.com/help/how-to-ask). — Some programmer dude, Mar 03 '17 at 09:47
@Someprogrammerdude : I used strcopy and It didn't work and I reformed My question thank you for pointing it out — Amir Bouker, Mar 03 '17 at 09:50

roottraveller · Accepted Answer · 2017-03-03T09:54:41.283

1

Data[i][j] is an array. You can't assign to an array, only copy to it. use strcpy(). more details at http://www.cplusplus.com/reference/cstring/strcpy/

#include <stdio.h>    
int main() {
    char Data[10][3][20];
    int i=0;
    int j=0;
    for (i=0;i<10;i++){
        for (j=0;j<3;j++){
            strcpy(Data[i][j], "aa"); //use strcpy for copy values 
        }
    }
    for (i=0;i<10;i++){
        for (j=0;j<3;j++) {    
            printf("%s ",Data[i][j]);
        }
        printf("\n");
    }
    printf("Done");
    scanf("%d",&i); //why this scanf here ??
    return 0;
}

edited Mar 03 '17 at 09:54

answered Mar 03 '17 at 09:51

roottraveller

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Thank you very much – Amir Bouker Mar 03 '17 at 09:54
@AmirBouker if this fix your error, don't forget to +1 it. :) – roottraveller Mar 03 '17 at 09:56

score 0 · Answer 2 · answered Mar 03 '17 at 09:54

You are creating an array of char and you cannot assign (a pointer) to it. This is why you are getting the error assignment to expression with array type.

You can copy the string to the array elements though. Try using strcpy instead of the below assignment in your code:

Data[i][j]="aa";

String matrix input output

2 Answers2