[SOLVED] C++ Multidimensional Array Issues

[seventheyejosh]

Hello All! I've begun learning C++ for college, and my php knowledge has made it very smooth. However, I cannot get array assignments to work . I believe I'm misunderstanding pointers/references, or not using strcpy(). Not sure what tho:

 

char something[2][50];

 

something[0]="Yo";

something[1]="Ho";

something[2]="What Is This";

 

yields : incompatible types in assignment of 'const char[LENGTH OF STRING]' to 'char [5]'

where length of string is 2,2, and 12 in this case.

 

Thanks all! This is very confusing to me.

[KevinM1]

Hello All! I've begun learning C++ for college, and my php knowledge has made it very smooth. However, I cannot get array assignments to work . I believe I'm misunderstanding pointers/references, or not using strcpy(). Not sure what tho:

 

char something[2][50];

 

something[0]="Yo";

something[1]="Ho";

something[2]="What Is This";

 

yields : incompatible types in assignment of 'const char[LENGTH OF STRING]' to 'char [5]'

where length of string is 2,2, and 12 in this case.

 

Thanks all! This is very confusing to me.

 

Well, first, you're going outside of your array boundaries.  something[2][50] is actually something[0-1][0-49].  Just like in PHP, arrays are 0-indexed.  The number of elements you specify are indexed as num-1.  Also, remember that C-style strings are null-terminated, so you have to account for that as well.

 

I'm wondering where the char[5] part of the error is coming from.  Can you show more code?

[seventheyejosh]

Here is my code & error. It is for a cootie game for class

 

char parts[6][50];

 

parts[0]="add the body";

parts[1]="add the head";

parts[2]="add an antenna, hat, or bow";

parts[3]="add an eye";

parts[4]="add a tongue, teeth, or lips";

parts[5]="add a leg";

 

and the error

 

cootie.cpp: In function ‘int main()’:

cootie.cpp:13: error: incompatible types in assignment of ‘const char [13]’ to ‘char [50]’

cootie.cpp:14: error: incompatible types in assignment of ‘const char [13]’ to ‘char [50]’

cootie.cpp:15: error: incompatible types in assignment of ‘const char [28]’ to ‘char [50]’

cootie.cpp:16: error: incompatible types in assignment of ‘const char [11]’ to ‘char [50]’

cootie.cpp:17: error: incompatible types in assignment of ‘const char [29]’ to ‘char [50]’

cootie.cpp:18: error: incompatible types in assignment of ‘const char [10]’ to ‘char [50]’

 

i believe the const char [length] is refering to the rvalue.

 

[corbin]

The difference is that the thing being assigned is a const char, and the array thing is a char array.

 

 

To assign something to a char array like that, the lengths will need to match.

 

 

Or, instead of an array, you could use a pointer.

 

 

char* parts[6];

 

parts[0]="add the body";

parts[1]="add the head";

parts[2]="add an antenna, hat, or bow";

parts[3]="add an eye";

parts[4]="add a tongue, teeth, or lips";

parts[5]="add a leg";

 

 

 

Depending on how you plan on manipulating the array though, the pointer way might not be the best idea.

[seventheyejosh]

Thx, that worked awesome