Question

#include int data[] = {1, 3, 5, 2, 4, 6, 7, 9, 8, 10}; int sum; int i; int done; void setup() { } void loop() { } int main() { setup(); while (!done) { loop(); } printf("Sum = %d\n", sum); return 0; }

Answer 1

Step 2: Compile to make sure you entered it correctly, but don't run it; it is an innite loop and running it will make you nervous. Note that setup() is called by main() exactly once and loop() is called as often as necessary to make the "done" value be interpreted as true.

Step 3: Add code to setup() to initialize "sum", "done" and "i" as necessary. Add code to loop() to compute the sum of the data. Each time it runs it needs to increment "i" and then use "i" to add an array value to sum. Run it to make sure the output is \Sum = 55". I ended up with three new lines of code in setup() and three other new lines of code in loop(). While you are working on this, your program may encounter an innite loop that you did not intend. If you don't get an output immediately, press Ctl-C (the Control key and the C key simultaneously). DO NOT modify main() in any way. DO NOT add code anywhere except to setup() and loop(). If you will perform the correct initializations in setup() and the correct computations, including setting "done" at the correct point, in loop(), this will work as required.

Answer 2

Im not sure how to start this, I dont know how to add the array values. Any help would be much appreciated.

Answer 3

a simple way to do this:
#include <stdio.h>
int data[] = {1, 3, 5, 2, 4, 6, 7, 9, 8, 10};
int summ=0;

int sum(int data[]){
for (i=0;i<10;i++){
summ += data[i];
}
return summ;
}

int main(){
printf("Sum= %d",sum(data[]))
}

Answer 4

return 0; before the last "}"

Answer 5

Should it be i<11? How does this add a space to the array after this sum is calculated? What does summ += data[i] do exactly? Does it increment where you are adding data in the array?

Answer 6

Thanks for your help by the way.

Answer 7

look at this, now is better:
#include <stdio.h>
int data[]={1, 3, 5, 2, 4, 6, 7, 9, 8, 10};
int i,summ=0;

int sum(int data[]){
for(i=0;i<10;i++){
summ += data[i];
}
return summ;
}

int main()
{
printf("Sum= %d",sum(data));
return 0;
}

Answer 8

it must be i<10, because we count the values of an array starting in position 0 so if we have an array with n elements i<n

Answer 9

got it?

Answer 10

ok, what code should go in loop and what code should go in setup?

setup()
{
sum = 0;
}
loop()
for (i=0; i<10; i++)
{
sum=sum+a[i];
}

Like that?

Answer 11

a = data

Answer 12

the loop is right, but the setup i do not understand why it is necessary here

Answer 13

I have to add code only in loop and setup, nowhere else.

Answer 14

Can loop stay a void type?

Answer 15

yes sure, but it's better stay it alone becouse you can call this function any time in our code

Answer 16

hey, maybe the setup() is here to call the loop(), gets the result and check the value if it's right returning a bool value... i'm not sure

Answer 17

Add code to setup() to initialize "sum", "done" and "i" as necessary. Add code to loop() to compute the sum of the data. Each time it runs it needs to increment "i" and then use "i" to add an array value to sum.

Answer 18

setup()
sum=0;
i=0;
how do initialize done?

loop()
for (i=0; i<10; i++)
{
sum=sum+data[i];
}
How does that look?

Answer 19

I think all I need is a way to set "done" in loop() - what do you think?

Answer 20

yeah maybe... but loop() have to return the sum

Answer 21

I got it, it compiled and returned sum=55, thanks Joao.

Answer 22

xD

Answer 23

@jakev8

Answer 24

@jakev8 .

Answer 25

I never initialized "done" - it still gave the correct output tho.