// declaring an array of integers
int numbers[] = { 90, 150, 30 };
int a, b;

void setup() {
  a = numbers[0] + numbers[1]; // Sets variable a to 240
  b = numbers[1] + numbers[2]; // Sets variable b to 180
}

// different ways of declaring arrays of chars
char string1[15];
char string2[7] = {'h', 'e', 'l', 'l', 'o', '!'};
char string3[7] = {'h', 'e', 'l', 'l', 'o', '!', ''};
char string4[] = "hello there!";

int a = 10;

// allocates an array for holding 10 characters 
// (last position is for holding the '' or NULL string terminator
char *string5 = new char[a+1];  

... 

// releases the memory space allocated for string5
delete [] string5;