What is the best way to split an array(mainArr) that holds 50 random integers into 5 different arrays that all contain 10 of the integers in each?
For example arr1 holds mainArr's 0-9 values, arr2 holds 10-19....
I have searched around but everything is splitting the array into two different arrays. Any help would be appreciated. Thanks.
To be a little more generic:
int mainArr[50];
int *arr[5];
int i;
for(i = 0; i < 5; i++)
arr[i] = &mainArr[i*10];
And then access for example mainArr[10]
as arr[1][0]
.
Just define a function that maps each index, 0..49, into another index 0..4. The obvious function is division by 10. Modulus by 5 also works though.
int a[50];
int b[5][10];
for (size_t i = 0; i < 50; i++)
b[i/10][i%10] = a[i];
or
int a[50];
int b[5][10];
for (size_t i = 0; i < 50; i++)
b[i%5][i/5] = a[i];
See @nnn's solution for an example that re-uses the same memory.
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