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arrays proplem
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hello ,Im a new member and Im not very good in english , so please excuse me , I have question :
write a C++ program that declares an array alpha of 50 component of type double . Initialize the array so that the first 25 components are equal to the square of the index variable , and the last 25 components are equal to the three times the index variable . output the array so that 10 elements per line are printed .
what does it this mean Initialize the array so that the first 25 components are equal to the square of the index variable ?
write a C++ program that declares an array alpha of 50 component of type double . Initialize the array so that the first 25 components are equal to the square of the index variable , and the last 25 components are equal to the three times the index variable . output the array so that 10 elements per line are printed .
what does it this mean Initialize the array so that the first 25 components are equal to the square of the index variable ?
>what does it this mean Initialize the array so that the first 25
>components are equal to the square of the index variable ?
I would assume something like this:
>components are equal to the square of the index variable ?
I would assume something like this:
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Once you declare an array you just reserve some amount of memory. This memory contains garbage. if you try to print all values of the array just after delaring it you will see just garbage. See folowing line of code.
Initialization means providing valid values to elements for the first time.
Narue's code intializes first 25 elements of the array. You can try initializing rest.
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Initialization means providing valid values to elements for the first time.
Narue's code intializes first 25 elements of the array. You can try initializing rest.
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I thought this was initialization:
int num[] = {1, 2, 3, 4};
and this:
represented serial assignment.
Furthermore I think that either the instructor, the OP, or I (and I don't think it's me this time) don't know the difference between iniatialization of the elements of an array and assignment to the elements of an array and use the two concepts interchangeably, as they can end up with the same result.
int num[] = {1, 2, 3, 4};
and this:
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Furthermore I think that either the instructor, the OP, or I (and I don't think it's me this time) don't know the difference between iniatialization of the elements of an array and assignment to the elements of an array and use the two concepts interchangeably, as they can end up with the same result.
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I believe we are confused in Initialization and declaration.
int i ; // declaration
int i = 10 ; declaration + initialization
i= 15 ; // assignment
You cannot only do initialization without declaration.
As per the initial question is concerned it is stupid to initialize the array with different values.
int alpha [50] = {1,2*2,3*3,…………………} ;// wrong syntax
int alpha[50] = {0} ; //initialize all the fifty elements by 0
Naure’s solution presumes taht the instructor wants to *assign* values to the array not exactly initialize. I agree with the solution.
int i ; // declaration
int i = 10 ; declaration + initialization
i= 15 ; // assignment
You cannot only do initialization without declaration.
As per the initial question is concerned it is stupid to initialize the array with different values.
int alpha [50] = {1,2*2,3*3,…………………} ;// wrong syntax
int alpha[50] = {0} ; //initialize all the fifty elements by 0
Naure’s solution presumes taht the instructor wants to *assign* values to the array not exactly initialize. I agree with the solution.
Last edited by dubeyprateek; Dec 28th, 2007 at 7:22 pm.
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before every thing thank you for helping , and Im asking if these answer is right :
also I have question how can I print 10 elements per line if I had 2 loop
and thank you very much ,
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and thank you very much ,
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Originally Posted by bis student 
before every thing thank you for helping , and Im asking if these answer is right :
also I have question how can I print 10 elements per line if I had 2 loopC++ Syntax (Toggle Plain Text)
and thank you very much ,
for loop and use an if else test condition to test for the first 25, do whatever...As regards printing 10 per line, you could make use of the % modulus operator to determine whether a newline should be printed
if (i % 10 == 0) .I hope this is of value.
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Originally Posted by superjacent
You're on the right track. Another solution would be to use only onefor loopand use anif elsetest condition to test for the first 25, do whatever...
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thank you again for helping , and I want another hint about print 10 elements per line because this if (i % 10 == 0) does is not work .
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Originally Posted by bis student
thank you again for helping , and I want another hint about print 10 elements per line because this if (i % 10 == 0) does is not work .
Yesterday is a history, tomorrow is a mystery, today is a gift.
Behind every smile is a tear.
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