Script started on Mon Oct  6 17:28:56 2025
Restored session: Wed Oct  1 18:44:53 EDT 2025
macbook:logs> cd ../programs/C_ch9
macbook:C_ch9> echo attendance code 6275
attendance code 6275
macbook:C_ch9> grep power *.c
power.c:int power(int x, int n) {
power.c:   printf("power(2,3) returns %d.\n", power(2,3)); 
power2.c:int power(int x, int n) {
power2.c:   printf("power(2,3) returns %d.\n", power(2,3)); 
macbook:C_ch9> cat power2.c
/* 
  Args vs Params   
  See Dr. King's book, chapter 9
*/

#include <stdio.h>

// Alternate form
int power(int x, int n) {
  int result = 1;
  // n is a *copy* 
  while (n-- > 0) 
    result = result * x;
  return result;
}

int main (int argc, char *argv[]) {

   
   printf("power(2,3) returns %d.\n", power(2,3)); 

   return 0;
}
macbook:C_ch9> gcc power2.c 
macbook:C_ch9> ./a.out
power(2,3) returns 8.
macbook:C_ch9> cp power2.c power2b.c
macbook:C_ch9> vi power2b.c
macbook:C_ch9> gcc power2b.c
macbook:C_ch9> cat power2b.c
/* 
  Args vs Params   
  See Dr. King's book, chapter 9
*/

#include <stdio.h>

// Alternate form
int power(int x, int n) {
  int result = 1;
  // n is a *copy* 
  while (n-- > 0) 
    result = result * x;
  return result;
}

int main (int argc, char *argv[]) {

   int a, b;
   a = 2;
   b = 3;   
   printf(" a is %d, and b is %d\n", a, b);
   printf("power(2,3) returns %d.\n", power(a,b)); 
   printf(" a is %d, and b is %d\n", a, b);

   return 0;
}
macbook:C_ch9> ./a.out
 a is 2, and b is 3
power(2,3) returns 8.
 a is 2, and b is 3
macbook:C_ch9> echo make a function to count the characters in a word
make a function to count the characters in a word
macbook:C_ch9> vi count_chars_in_word.c
macbook:C_ch9> vi count_chars_in_word.c
macbook:C_ch9> gcc count_chars_in_word.c
macbook:C_ch9> ./a.out
Please enter a word: 123
^D
The number of chars is 4
macbook:C_ch9> ./a.out
Please enter a word: baseball^D
^D
The number of chars is 9
macbook:C_ch9> ./a.out
Please enter a word: baseball
^D
The number of chars is 9
macbook:C_ch9> echo "baseball" | ./a.out
Please enter a word: 
The number of chars is 9
macbook:C_ch9> cat count_chars_in_word.c
/*
   count_chars_in_word.c

   To compile: 
     gcc count_chars_in_word.c

   make a function to count the characters in a word
   in class exercise
   October 6, 2025
*/

#include <stdio.h>

int main() {

  int counter = 0;
  int num_read = 0;
  char word;
  printf("Please enter a word: ");
  num_read = scanf("%c", &word); 
  // loop
  while (num_read > 0) 
  {
    counter++;
    num_read = scanf("%c", &word);
  }  
 
  printf("\nThe number of chars is %d\n", counter);

  return 0;
}
macbook:C_ch9> exit

Saving session...
...saving history...truncating history files...
...completed.
Deleting expired sessions...      10 completed.

Script done on Mon Oct  6 18:44:46 2025