easy for loop question

My C programming skills are pretty bad but I’ll ask this question anyway. The code below has been simplified for this question. How can each spin of the for loop check each function below?

for (i=0; i<8; i++)
{
clock(); //clocks 8 times
set_up_pini(); //want to check each below but get an error here
}

void set_up_pin1()
{
digitalWrite(Select_A, LOW);
digitalWrite(Select_B, LOW);
digitalWrite(Select_C, LOW);
}

void set_up_pin2()
{
digitalWrite(Select_A, HIGH);
digitalWrite(Select_B, LOW);
digitalWrite(Select_C, LOW);
}

How can each spin of the for loop check each function below?

Once more, in English, please. Loops don't spin. They iterate. What does "check each function" mean? The compiler checked the function before the linker built the executable code that was uploaded.

//want to check each below but get an error here

Because you haven’t declared a function called “set_up_pini”

Ahh.

Thanks AWOL!