How to find minimum value from vector

Question

How can I find the minimum value from a vector   int main         int v 100     5 14 2 4 6       int n   5      int mic   v 0       for int i 0 i lt v n  i                  if v i  lt mic          mic v i             cout lt  lt mic      But is not working  what can I do

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include  lt iostream gt  int main         int v 100     5 14 2 4 6       int n   5      int mic   v 0       for int i   0  i    n    i                if v i   lt  mic          mic   v i             std cout  lt  lt  mic  lt  lt  std  endl

User · Answer

Try this with    std  min element v begin   v end

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include  lt iostream gt   include  lt vector gt   include  lt algorithm gt     std  min element  include  lt iterator gt      std  begin  std  end  int main         std  vector lt int gt  v    5 14 2 4 6       auto result   std  min element std  begin v   std  end v        if  std  end v   result          std  cout  lt  lt   result  lt  lt    n         The program you show has a few problems  the primary culprit being the for condition  i lt v n   You initialize the array  setting the first 5 elements to various values and the rest to zero  n is set to the number of elements you explicitly initialized so v n  is the first element that was implicitly initialized to zero  Therefore the loop condition is false the first time around and the loop does not run at all  your code simply prints out the first element   Some minor issues    avoid raw arrays  they behave strangely and inconsistently  e g   implicit conversion to pointer to the array s first element  can t be assigned  can t be passed to returned from functions by value  avoid magic numbers  int v 100  is an invitation to a bug if you want your array to get input from somewhere and then try to handle more than 100 elements  avoid using namespace std  It s not a big deal in implementation files  although IMO it s better to just get used to explicit qualification  but it can cause problems if you blindly use it everywhere because you ll put it in header files and start causing unnecessary name conflicts

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template  lt class ForwardIterator gt  ForwardIterator min element   ForwardIterator first  ForwardIterator last         ForwardIterator lowest   first      if  first    last  return last      while    first    last      if   first  lt   lowest           lowest   first      return lowest

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You have an error in your code  This line   for int i 0 i lt v n  i      should be  for int i 0 i lt n i      because you want to search n places in your vector  not v n  places  which wouldn t mean anything

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You can always use the stl   auto min value    std  min element v begin   v end

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std  min element vec begin    vec end    - for std  vector std  min element v  v n  - for array std  min element  std  begin v   std  end v    - added C  11 version from comment by  JamesKanze

[c++] How to find minimum value from vector?

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