/* Author: ~swim~ Created: 13-April-2018 Edits - 13-April-2018 Updated the random number generator on Nevfy's suggestion Description: Given a matrix the code finds whether the numbers in row and column repel (<>) or attract (><) each other. Note: If the number is even its a positive pole(+). If the is number is odd is a negitive pole(-). Input: Enter rows and columns separated by space or line. */ #include #include #include #include #include #include #include using namespace std; using VA = valarray; auto Balance=[](int u, int v) { int sum{}; do { int ru = u%10; int rv = v%10; // add 1 if replusive (both // digits odd or even. Subtract 1 // if attractive sum += ((ru&1 && rv&1) || (!(ru&1) && !(rv&1))) ? 1 : -1; u/=10; v/=10; }while(u>0 && v>0); return sum; };// end Balance // process elements of adjacent // columns auto Pcol=[](int u, int v) { cout << u; int sum = Balance(u,v); // sum > 0, is repulsive("<>") // sum < 0, is attractive("><") // sum = 0, is balanced("~~") cout << (sum > 0 ? " <> " : sum < 0 ? " >< " : " ~~ "); };//end Pcol // process element at row and row // below it auto Prow=[](int u, int v, stringstream& t1, stringstream& t2){ int sum = Balance(u,v); // getting the length just for // formatting the output. Should i // pass it instead? int len = (0==u) ? 1 : floor(log10(u))+1; int f = len&1 ? 3 : 4; len = len&1 ? len+1 : len; // sum > 0, is repulsive("^","v") // sum < 0, is attractive("v","^") // sum = 0, is balanced("~","~") sum>0 ? ((t1 << setw(len/2) << right << "^" << setw(len/2+f) << " "), (t2 << setw(len/2) << right << "v" << setw(len/2+f) << " ")) : sum<0 ? ((t1 << setw(len/2) <> row >> col >> digits; VA mag(row*col); std::srand(std::time(nullptr)); // fill the matrix with random values // of length equal digits int rmin{}; int rmax{}; if (1 == digits){ rmin = 0; rmax = 10; } else { rmin = pow(10,digits-1); rmax = pow(10,digits); } std::generate(std::begin(mag), std::end(mag),[=]{ int rnum{}; // get the random number till it is // not of the correct length return rmin+(rand()%(rmax-rmin));}); // start processing for(int rw=0; rw

magnetic_numbers_extended(using valarray).cpp