Массивы переменных "C"

#include <stdio.h>

int main()
{
    int arr[3];
    
    arr[0] = 100;
    arr[1] = 200;
    arr[2] = 300;
    
    char str[10] = {'C', ' ', 'P', 'r', 'o', 'g', 'r', 'a', 'm', '\0'};
    
    printf("1st value: %d \n", arr[0]);
    printf("2st value: %d \n", arr[1]);
    printf("3st value: %d \n", arr[2]);
    printf("char str complete: %s \n", str);
    
return 0;
}