#include <stdio.h> 

//Power function we implemented in class. 
float power(float base, unsigned int ex) { 

  float retVal = 1.0f; 
  
  for(int i = 0; i < ex; i++)
    retVal = retVal * base; 

  return retVal; 
} 
//Functions do not always have to take in parameters. If you have no parameters to 
//pass into the function  then use (). Also a function does not need to 
// ALWAYS return a value. If  a function does not return a value 
// (i.e., in this case is does not) then void 
// is used as it's return-type. 
void calculatePower() { 
  float base; 
  unsigned int ex; 

  printf("Enter in base:"); 
  scanf("%f",&base); 
  
  printf("Enter in exponent:"); 
  scanf("%d",&ex); 

  /* Notice how I needed to define the power function above the
     calculatePower function in order to use it. This is important 
     to do. For now, if you write a function and you want to 
     use it in another function you need to implement it before
     you call it in another function. Thus, I want to call power
     in the calculatePower function then I need to make sure I 
     implemented the power function before the calculatePower
     function. 
  */ 
  float powerVal = power(base,ex);

  printf("%f^%d = %f\n",base,ex,powerVal); 
} 
int main (void) { 

  calculatePower(); 

  return 0; 
}