1 float myRound (float src, int idx) 2 { 3     //move idx numbers right of the point 4     //to the left 5     for (int i = idx; i--;) { 6         src *= 10; 7     } 8  9     //get left part of src10     float dest = static_cast<int>(src);11     12     //if the number behind the idx13     //are larger than 5, then article idx plus 114     if (src >= dest + 0.5) {15         dest += 1;16     }17 18     //right nuber back to home19     for (int i = idx; i--;) {20         dest /= 10;21     }22     return std::move (dest);23 }