get the size of an array in c code example

Example 1: size of an array c

int a[20];
int length;
length = sizeof(a) / sizeof(int);

Example 2: get length of array in c

int a[17];
size_t n = sizeof(a)/sizeof(a[0]);

Example 3: how to get the index of an array in javascript

search = (arr, item) => { return arr.indexOf(item); }