Code

 Header...
//
// Demonstrate function prototypes
//

double mypow (double base,int exponent);
void printexp (double x,int j);

 int main(){
   ... 

»  double base=5.3;
»  int n=2;

»  printexp(base, n);

»  return 0;
}

//
// Print out x to the power j, warning if x and j are invalid
//
 void printexp(double base,int j){
   ... 

»  if (base==0.0&&j<0) {
»    printf("Invalid values to printexp\n");
»    return ;
  }
»  printf("%f to the power %d is %f\n", base, j, 
         mypow(base, j));
}

//
// Return base to the power of exponent.
// If base == zero and exponent < zero, return zero
//
 double mypow(double base,int exponent){
   ... 

»  double result=1.0;

»  if (base==0.0&&exponent<0) 
    return 0.0;

»  while (exponent>0) {
»    result*=base;
»    --exponent;
  }
  
»  while (exponent<0) {
»    result/=base;
»    ++exponent;
  }
  
»  return result;
}

Data