Battle Ship Game Random Generator

Cagdas (13)
Hi everyone,

i'm a kind of newbee in both this forum & c++ programming, anyway i wrote a code which is randomly generates ships in a 10x10 grid. here is the details;

battleship: size: 4 quantity: 1 shown as 'a'
cruiser: size: 3 quantity: 2 shown as 'k'
submarine: size: 1 quantity: 4 shown as 'd'
patrol boat: size: 2 quantity: 3 shown as 'm'

total number of placed ships is 10

and here is the code;

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#include <iostream>
#include <cstring>
#include <ctime>

using namespace std;

unsigned char* board;

int obj = 0;
int kru = 0;
int den = 0;
int muh = 0;
int ami= 0;


bool kontrol(int* yer, int ent=0, int yon=0) {
	switch(yon) {
	case 0:
		if(board[*yer] != 0) return false;
		break;
	case 1:
		for(int i=0; i < ent; i++) 
			if(board[*yer+i] != 0) return false;
		break;
	case 2:
		for(int i=0; i< ent; i++)
			if(board[*yer+i*10] != 0) return false;
		break;
	}

	return true;
}
			

void ekle(int* yer, int ent) {
	int yon=0;
	switch (ent) {
	case 1:
		if (kru < 2) {
			yon=rand() %2 + 1;
		switch (yon) {
		case 1:
			if( *yer % 10 < 8)
				if(kontrol(yer, 3, yon)) {
					memset(board+*yer,'k',3);
					kru++;
					obj++;
					}
			break;
		case 2:
			if((int)*yer/10 < 8)
				if(kontrol(yer, 3, yon)) {
					board[*yer] = 'k'; board[*yer+10] = 'k'; board[*yer+20] = 'k';
					kru++;
					obj++;
					}
			break;
		default: break;
		}
		}
		break;
	case 2:
		if (den < 4)
			if(kontrol(yer)) {
				memset(board+*yer,'d',1);
				den++;
				obj++;
		}
		break;
	case 3:
		if (muh < 3) {
			yon=rand() %2 +1;
			switch(yon) {
			case 1:
				if( *yer % 10 < 9)
					if(kontrol(yer,2, yon)) {
					memset(board+*yer,'m',2);
					muh++;
					obj++;
					}
			break;
			case 2:
				if((int)*yer/10 < 9) 
					if(kontrol(yer, 2, yon)) {
					board[*yer] = 'm'; board[*yer+10] = 'm';
					muh++;
					obj++;
					}
				break;
			default: break;
			}
		}
		break;
	case 4:
		if (ami < 1) {
			yon=rand() %2 +1;
			switch(yon) {
			case 1:
				if( *yer % 10 < 7)
					if(kontrol(yer, 4, yon)) {
					memset(board+*yer,'a',4);
					ami++;
					obj++;
					}
			break;
			case 2:
				if((int)*yer/10 < 7) 
					if(kontrol(yer, 4, yon)) {
					board[*yer] = 'a'; board[*yer+10] = 'a'; board[*yer+20] = 'a'; board[*yer+30] = 'a';
					ami++;
					obj++;
					}
				break;
			default: break;
			}
		}
		break;

	default: break;
	}
}

int main() {
	board = new unsigned char[100];
	memset(board, 0, 100);
	srand((unsigned) time(NULL));
	int sec=0;
	int eva=0;
	while(eva < 100) {
		if(rand() %100 > 90) {
			sec =rand() %4 + 2;
			ekle(&eva,sec);
		}
		eva++;
		}
	while(obj < 10) {
		eva=rand() %100;
		if(kru < 2) ekle(&eva, 1);
		if(den < 4) ekle(&eva, 2);
		if(muh < 3) ekle(&eva, 3);
		if(ami < 1) ekle(&eva, 4);
		}
	for(int i=0; i<10; i++) {
		for(int g=0; g<10; g++)
			cout << board[i*10+g];
		cout << endl;
	}
	cout << "Ship Count = " << obj << endl;
	cout << "Deleting Game Board... " << endl;
	delete [] board;
	system("pause");
	return 0;
}


the program looks to me running fast and produce exact results. And i wonder how the algorithm looks to you? and can you please show me different approaches to solving this problem which are lesser code length and lesser running time.

thank you all, and forgive me for my poor english!!
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