You only initialize the first N positions to the values in braces and all others are initialized to 0. In this case, N is the number of arguments you passed to the initialization list, i.e.,
float arr1[10] = { }; // all elements are 0 float arr2[10] = { 0 }; // all elements are 0 float arr3[10] = { 1 }; // first element is 1, all others are 0 float arr4[10] = { 1, 2 }; // first element is 1, second is 2, all others are 0
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