110923_cs131_lab1.c

#include <stdio.h>

int getNumberFromUser();

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

  printf("MAIN BEGINS!\n");

  //Do the following code ten times
  for(i=0; i<10; i++)
  {
    usersNumber=getNumberFromUser();
    printf("You entered… %d!\n", usersNumber);
  }

  printf("MAIN ENDS!\n");
  return 0;
}

int getNumberFromUser()
{
  int theNumber;
  return theNumber;
}

110923_cs131_lab2.c

#include <stdio.h>

int twice(int n); 
int doubleOneMultipleTimes(int timesToDouble);

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

  printf("Please enter a number:");
  scanf("%d",&usersNumber);

  printf("If you double 1,  %d times, you'll get %d.\n",  2, twice(twice(1)));

  twoToTheUsersNumber = 17;
  printf("If you double 1, %d times, you'll get %d. I think.\n", 
    usersNumber, twoToTheUsersNumber);
  return 0;
}


int twice(int n) { return 2*n; } 

int doubleOneMultipleTimes(int timesToDouble)
{
  int theResult;
    
  if(timesToDouble<0) theResult=1/doubleOneMultipleTimes(-timesToDouble);
  else if(timesToDouble==0) theResult=1;
  else theResult=twice(doubleOneMultipleTimes(timesToDouble-1));
   
  return theResult;
}

110923_cs131_lab3.c

#include <stdio.h>

void pause();

int main(int argc, char* argv[])
{
  printf("Enter two letters/numbers/symbols, then press enter twice.\n");
  printf("That letter is character number: %d\n", getchar());
  printf("That letter is character number: %d\n", getchar());
  printf("That letter is character number: %d\n", getchar());
  printf("That letter is character number: %d\n", getchar());
  pause();
  printf("And now, for something completely different!\n");
  pause();
  printf("Platypus.\n");
  return 0;
}

void pause()
{
  printf("This would be a great time to pause… but how!?\n");
}

110923_cs131_lab4.c

#include <stdio.h>

int afunc(int x, int y);
int bfunc(int y, int x);
int cfunc(int z, int w);

int main(int argc, char* argv[])
{
  int x;
  int y;
  printf("MAIN BEGINS\n");
  x=7;
  y=11;
  x=afunc(x,y);
  y=bfunc(y,x);
  printf("The answer is %d\n", cfunc(x,y));
  printf("MAIN ENDS\n");
  return 0;  
}

int afunc(int x, int y)
{
  int returnme;
  printf("-> calling afunc(%d, %d)\n", x,y);
  returnme = x+y;
  printf("<- afunc(%d, %d) returns %d\n", x,y, returnme);
  return returnme;
}

int bfunc(int y, int x)
{
  int returnme;
  returnme = cfunc(y,x)*cfunc(x,y);
  return returnme;
}

int cfunc(int z, int w)
{
  return w%z;
}

110923_cs131_lab4.output.txt

MAIN BEGINS
-> calling afunc(7, 11)
<- afunc(7, 11) returns 18
-> calling bfunc(11, 18)
-> calling cfunc(11, 18)
<- cfunc(11, 18) returns 11
-> calling cfunc(18, 11)
<- cfunc(18, 11) returns 7
<- bfunc(11, 18) returns 77
-> calling cfunc(18, 77)
<- cfunc(18, 77) returns 5
The answer is 5
MAIN ENDS