I'm new to programming in C++ and I'm trying to figure out how to choose a random variable out of a selection of given variables. There were other posts I found on this topic but none of them quite clarified it for me.
This is my script:
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int main ()
string answer; //These are the 4 possible answers
answer = "Yes.";
answer = "No.";
answer = "Maybe.";
answer = "Ask again later.";
int r = rand()%4; //To roll which one of these will be said.
cout << answer[r];
cin >> blank; //Blank Cin line so the cmd doesn't close immediately.
It doesn't error message, but the program it creates doesn't respond when I run it and crashes. What am I doing wrong here?
When you're declaring arrays, you declare the size you want. The index will always start at zero and contain the number of elements you've specified.
So, your original array would have only contain 0, 1 and 2 as you specified a size of three. When you were trying to access a fourth element, with an index of 3 (your "Ask again later" line), you were trying to access an out of bounds array index.
Like I said, you need to seed the random number generator. You can pass a number into it but the best convention is to use the system time as a seed.
Here's a quick example:
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int main( int argc, char* argv )
srand( time( NULL ) ); // Seed PRNG
// Output random number between 1 and 10
std::cout << rand() % 10 + 1;