C float array initialization

Question

Possible Duplicate    C and C     Partial initialization of automatic structure       While reading Code Complete  I came across an C   array initialization example     float studentGrades  MAX STUDENTS       0 0      I did not know C   could initialize the entire array  so I ve tested it      include  lt iostream gt  using namespace std   int main         const int MAX STUDENTS 4      float studentGrades  MAX STUDENTS       0 0        for  int i 0  i lt MAX STUDENTS  i              cout  lt  lt  i  lt  lt       lt  lt  studentGrades i   lt  lt    n             return 0      The program gave the expected results   0 0 1 0 2 0 3 0   But changing the initialization value from 0 0 to  say  9 9   float studentGrades  MAX STUDENTS       9 9      Gave the interesting result   0 9 9 1 0 2 0 3 0   Does the initialization declaration set only the first element in the array

User · Answer

No  it sets all members elements that haven t been explicitly set to their default-initialisation value  which is zero for numeric types

User · Answer

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

[c++] C++ float array initialization

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