What to use

Hello
i just want to know what can i use to add the elements of two given arrays

i have tried for and failed big time so did i make a problem or is it not for to begin with?

Add them in what way? Into one single sum, or the elements added individually into a new array, or each array added separately to give you the sum of each array?
For example you can use a loop or some standard algorithm.:)
+
No i need to add them in a single sum
but it only adds the first number of the first array with the first number of the second array and so on
If your arrays have equal numbers of elements then you can use standard algorithm std::inner product. Otherwise you can use standard algorithm std::accumulate. For example

 ``123456789101112`` ``````int a[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; int b[] = { 9, 8, 7, 6, 5, 4, 3, 2, 1 }; int sum = std::inner_product( std::begin( a ), std::end( a ), std::begin( b ), 0, std::plus(), std::plus() ); std::cout << "sum = " << sum << std::endl; sum = std::accumulate( std::begin( a ), std::end( a ), std::accumulate( std::begin( b ), std::end( b ), 0 ) ); std::cout << "sum = " << sum << std::endl;``````
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WOW
i am still a beginner , i have no idea what is this std::
can you explain it if thats not too much to ask ?
In fact I wrote

 ``123456789101112131415`` ``````int a[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; int b[] = { 9, 8, 7, 6, 5, 4, 3, 2, 1 }; int sum = 0; for ( int i = 0; i < sizeof( a ) / sizeof( *a ); i++ ) sum += a[i] + b[i]; std::cout << "sum = " << sum << std::endl; sum = 0; for ( int i = 0; i < sizeof( a ) / sizeof( *a ); i++ ) sum += a[i]; for ( int i = 0; i < sizeof( b ) / sizeof( *b ); i++ ) sum += b[i]; std::cout << "sum = " << sum << std::endl;``````

If you do not like std:: then you can write at the very beginning

using namespace std;

and then remove all occurences of std::

:)
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A namespace is simply a reference to a particular context, some things require this context (like cout). For more detailed info go to:

http://www.cplusplus.com/doc/tutorial/namespaces/

As far as your arrays go, you could do something like this:

 ``12345678910`` ``````int i, sum1=0, sum2=0, total; int maxindexa, maxindexb; //These are the last array index number for your arrays //here you would assign maxindexa and maxindexb for(i=0;i<=maxindexa;i++) { sum1+=a[i]; } for(i=0;i<=maxindexb;i++) { sum2+=b[i]; } total = sum1 + sum2;``````

Very simple
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