Is there a way to have printf() properly print out an array (of floats, say)?

I don't think there is a way to print array for you in printf. "printf" function has no idea how long your array is.

You have to loop through the array and printf() each element:

for(int i=0;i<10;++i) {
  printf("%.2f ", foo[i]);
}

printf("\n");

you need to iterate through the array's elements

float foo[] = {1, 2, 3, 10};
int i;
for (i=0;i < (sizeof (foo) /sizeof (foo[0]));i++) {
    printf("%lf\n",foo[i]);
}

or create a function that returns stacked sn printf and then prints it with

printf("%s\n",function_that_makes_pretty_output(foo))

You need to go for a loop:

for (int i = 0; i < sizeof(foo) / sizeof(float); ++i)
   printf("%f", foo[i]);
printf("\n");

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