CODEWITHSUNDEEP
cfor-loop
Thao Nguyen
Thao Nguyen

Reputation: 901

adding values in a for loop

int n, total, array[4] = {5,4,2,7}

for (n =0; n<4; n++)
{
total = array[n] + array[n+1];
}

5+4=9+2=11+7=18

I know that I need to store the value of the sum into a variable but how do I make the variable loop back to be added to the next number in the array.

Upvotes: 0

Views: 6750

Answers (3)

Jim Balter
Jim Balter

Reputation: 16406

Your code sets

total = array[0] + array[1] -> 9

then

total = array[1] + array[2] -> 6

then

total = array[2] + array[3] -> 9

then

total = array[3] + array[4] -> undefined behavior

which of course not what you want. You ask

I know that I need to store the value of the sum into a variable but how do I make the variable loop back to be added to the next number in the array.

Well, the variable is total, and you want to add it to the next number in the array; that's simply

total = total + array[n]

(or total += array[n]).

All that remains is to initialize total = 0 so that the first add (total = total + array[0]) sets total to array[0] rather than some undefined value.

Upvotes: 1

Revil
Revil

Reputation: 145

You don't have to do the array+1 position adding. Only have to accum the values in one variable

// Declaration of total variable and values array
int total=0, array[4]={5,4,2,7}

// For loop
for (int n=0; n<4; n++) {
    // Total accum
    total+=array[n];
    // Use += or you can use too this: total=total+array[n];
}

Upvotes: 3

Ed.
Ed.

Reputation: 1182

int n, total = 0, array[4] = {5,4,2,7}

for (n =0; n<4; n++)
{
  total += array[n];
}

Upvotes: 5

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