Question bout C++, above is the question from my textbook:

My code has no syntax error but when I run it, it output nothing as below:

Below is my code:

//13.It's in the main function already //pre-condition: 25 different number from 1-25 //post-condition: 4 different random number picked from the above prize(25);

void prize(int candidate) { int a, b, c, d; srand(100); while (int i = 1) { a = (rand() % candidate) + 1; b = (rand() % candidate) + 1; c = (rand() % candidate) + 1; d = (rand() % candidate) + 1; if (a == b || a == c || a == d || b == c || b == d || c == d) i = 1; else i = 0; } cout

So I know there is other solutions for this problem (I searched it online before) they use for loop:

#include

using namespace std;

int main() {

srand(time(NULL));

int finalists[4] = {0};

cout

for(int i = 0; i

bool inValid = true;

while(inValid) {

inValid = false;

finalists[i] = rand() % 25 + 1;

for(int j = 0; j

if(finalists[i] == finalists[j]) {

inValid = true;

}

}

}

cout

}

}

But my problem is I haven't learnt array yet. Also, I want to know why my method can't work.

Anyone could help me out??? IDK what part I got wrong..

Thank you so much!

(((((P.SIf you could also explain the second method that would be helpful!!

I don't got why they put while loop b/t those two for loop? what's the usage of it?

Also, what is the meaning of the if requirement (finalist[i]==finalist[j])inside of the inner for loop .))))))

13. You have four identical prizes to give away and a pool of 25 finalists. The final- ists are assigned numbers from 1 to 25. Write a program to randomly select the numbers of 4 finalists to receive a prize. Make sure not to pick the same number twice. For example, picking finalists 3, 15, 22, and 14 would be valid but picking 3, 3, 31, and 17 would be invalid, because finalist number 3 is listed twice and 31 is not a valid finalist number. 13. You have four identical prizes to give away and a pool of 25 finalists. The final- ists are assigned numbers from 1 to 25. Write a program to randomly select the numbers of 4 finalists to receive a prize. Make sure not to pick the same number twice. For example, picking finalists 3, 15, 22, and 14 would be valid but picking 3, 3, 31, and 17 would be invalid, because finalist number 3 is listed twice and 31 is not a valid finalist number