最后数组打印0 C ++

Question

I'm making a dice game in C++, and in my program I have some arrays.

die[5] = { (rand()%6)+1, (rand()%6)+1, (rand()%6)+1, (rand()%6)+1, (rand()%6)+1 };

And then I use the arrays with

cout<<"First die: "<< die[0] <<"\n"

etc

But, when I run the program, the last array will always print 0, is there a way I can fix this?

Answer 1

You're not really giving much information, but here's my guess:

• You're stepping too far. The last spot in the array is die[4], and chances are you're using die[5], which means you're accessing memory you're not supposed to. On some systems, this will automatically initialize as "0".

Arrays of size N always include N elements ranging from 0 to N-1. Using array[N] accesses memory beyond the range of the array. This could be unused memory (best case) or memory assigned to something else. The result is TROUBLE. Do not do this.

Answer 2

In your code you have this line:

54.  cout<<"Sixth die: " << die[5] <<"\n";

which is an invalid access as die has only 5 elements thus 0 to 4 are valid indexes.

This is actually "undefined behaviour". Your program might core-dump / give an access violation but it doesn't have to. It can instead just output some random number or zero...