c 2b 2b float array zero

1float arr1[10] = { };       // all elements are 0
2float arr2[10] = { 0 };     // all elements are 0
3float arr3[10] = { 1 };     // first element is 1, all others are 0
4float arr4[10] = { 1, 2 };  // first element is 1, second is 2, all others are 0