C how to initialise an array at runtime code example

Example 1: c array initialization

int x[] = {1,2,3}; // x has type int[3] and holds 1,2,3
int y[5] = {1,2,3}; // y has type int[5] and holds 1,2,3,0,0
int z[3] = {0}; // z has type int[3] and holds all zeroes

Example 2: how to initialize an array in c

double balance[5] = {1000.0, 2.0, 3.4, 7.0, 50.0};