C++ Bc. 38 cpp
#include <iostream> #include <cstdlib> #include <ctime> bool pokus(char[], int dim); int main() { char listek[] = {'r', 'o', 'k', 'o', 'k', 'o'}; const int L = sizeof(listek); std::srand(std::time(0)); // inicializace generatoru rand() double soucet =0; double celkem = 0; std::cout.setf(std::ios_base::fixed, std::ios_base::floatfield); std::cout.precision(4); const int N = 1000000; for (int k=1; k<=10; k++) { int s = 0; for (int i=1; i<=N; i++) if (pokus(listek, L)) s++; std::cout << double(s)/N << std::endl; soucet += s; celkem += N; } std::cout << "-------\n"; std::cout << soucet/celkem << std::endl; } bool pokus(char text[], int dim) { // vypocet nahodne permutace int k, i=dim; while (i>0) { k = int( i*(rand()/(RAND_MAX + 1.0)) ); std::swap(text[--i], text[k]); } return text[0]=='k' && text[1]=='r' && text[2]=='o' && text[3]=='k'; }
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