ex5-1.c

/* code: ex5-1.c   (v1.20.00) */
#include <stdio.h>

int main () {
  int i;

  for (i = 0; i < 10; i++)
    printf ("%d ", i);
  printf ("\n");

  for (i = 0; i < 10; i++)
    printf ("%d ", i);
  printf ("\n");

  for (i = 0; i < 10; i++)
    printf ("%d ", i);
  printf ("\n");

  return 0;
}

ex5-2.c

/* code: ex5-2.c   (v1.20.00) */
#include <stdio.h>

void print_numbers (void) {
  int i;

  for (i = 0; i < 10; i++)
    printf ("%d ", i);
  printf ("\n");
}

int main () {
  print_numbers ();
  print_numbers ();
  print_numbers ();
  return 0;
}

ex5-3.c

/* code: ex5-3.c   (v1.20.00) */
#include <stdio.h>

void print_numbers (void);

int main () {
  print_numbers ();
  print_numbers ();
  print_numbers ();
  return 0;
}

void print_numbers (void) {
  int i;

  for (i = 0; i < 10; i++)
    printf ("%d ", i);
  printf ("\n");
}

ex5-4.c

/* code: ex5-4.c   (v1.20.00) */
#include <stdio.h>

void g (void) {
  int i;
  for (i = 0; i < 3; i++) {
    printf ("a");
  }
}

void f (void) {
  int i;
  for (i = 0; i < 5; i++) {
    g ();
  }
}

int main (int argc, char **argv) {
  f ();
  return 0;
}

ex5-5.c

/* code: ex5-5.c   (v1.20.00) */
#include <stdio.h>

float triangle (float base, float height) {
  float c;
  c = (base * height) / 2.000F;
  return c;
}

int main () {
  float t;
  t = triangle (3.00, 4.00);
  printf ("triangle = %f\n", t);
  t = triangle (5.00, 6.00);
  printf ("triangle = %f\n", t);

  return 0;
}

ex5-6.c

/* code: ex5-6.c   (v1.20.00) */
#include <stdio.h>

void add_pass_by_value (int i) {
  i = i + 1;
}

void add_pass_by_reference (int *i) {
  *i = *i + 1;
}

int main () {
  int a;

  a = 10;
  add_pass_by_value (a);
  printf ("%d\n", a);

  a = 10;
  add_pass_by_reference (&a);
  printf ("%d\n", a);

  return 0;
}

ex5-7.c

/* code: ex5-7.c   (v1.20.00) */
#include <stdio.h>

int factorial (int n) {
  if (n == 0) {
    return 1;
  }
  else {
    return n * factorial (n - 1);
  }
}

int main () {
  int i;
  i = 5;
  printf ("%d! = %d\n", i, factorial (i));

  return 0;
}

q5-1.c

/* code: q5-1.c   (v1.20.00) */
#include <stdio.h>

float trapezoid (float a, float b, float h) {
  float c;
  c = ((a + b) / 2.000F) * h;
  return c;
}

int main () {
  float t;
  t = trapezoid (3.00, 4.00, 5.00);
  printf ("trapezoid = %f\n", t);
  t = trapezoid (5.00, 6.00, 7.00);
  printf ("trapezoid = %f\n", t);

  return 0;
}

q5-2.c

/* code: q5-2.c   (v1.20.00) */
#include <stdio.h>

struct student {
  int id;
  char grade;
  float average;
};
typedef struct student STUDENT_TYPE;

STUDENT_TYPE initialize_student_record (STUDENT_TYPE s) {
  s.id++;
  s.grade = 'x';
  s.average = 0.0;
  return s;
}

int main () {
  STUDENT_TYPE student;

  student.id = 20;
  student.grade = 'a';
  student.average = 300.000;
  printf ("%d %c %f\n", student.id, student.grade, student.average);
  student = initialize_student_record (student);
  printf ("%d %c %f\n", student.id, student.grade, student.average);

  return 0;
}

q5-3.c

/* code: q5-3.c   (v1.20.00) */
#include <stdio.h>

int fibonacci (int n) {
  if (n == 0) {
    return 0;
  }
  else if (n == 1) {
    return 1;
  }
  else {
    return (fibonacci (n - 1) + fibonacci (n - 2));
  }
}

int main () {
  int i;
  i = 10;
  printf ("fibonacci(%d) = %d\n", i, fibonacci (i));

  return 0;
}

q5-4.c

/* code: q5-4.c   (v1.20.00) */
#include <stdio.h>

void foo (int n) {
  if (n < 15) {
    foo (n + 1);
    printf ("%d ", n);
  }
}

int main () {

  foo (0);

  return 0;
}

q5-5.c

/* code: q5-5.c   (v1.20.00) */
#include <stdio.h>

int factorial (int n) {
  if (n == 0) {
    return 1;
  }
  else {
    return n * factorial (n - 1);
  }
}

int main () {
  int i;
  /* i = -1; */
  i = 1;
  printf ("%d! = %d\n", i, factorial (i));

  return 0;
}