C Course Exams

Midterm Review 3

Questions covering chapters 2- 12

Run the code for answers

Problem 1

What gets printed ?

#include < stdio.h>
const int n = 4;

int main(void)
{
   int  i, sum = 0, a[10] = {1, 2, 3, 4, 5, 6, 7, 8, 9};

   i = 0;
   while (i <= n){
      sum += a[i];
      printf("%d is sum\n", sum);
      ++i;
   };
   return 0;
}
Problem 2

typedef struct pair{ double x, y;} pair;

pair w = {0.5, 2.5};
pair *p = &w;

What is the value of w.y?   ---------
What is the value of p -> x?   ---------

Write a routine  void print_pair(pair w); /* nicely output pair */

Problem 3

Fill in the integer value of each expression assuming the following 
declarations: 

           int i = 1, j = 3, k = 4; 

 Expression                 Value

   i <= j 

   j % k

   k / j 

   2 * i + 1  < =  j

   !i <= 2 

Problem 4

What gets printed?

#include < stdio.h>
int f (int a)  {return (2* a + 1); }
int g (int *y) { *y += 1; return (*y + *y); }

int main(void)
{
   int i = 11, j = -2;
	   printf(" f = %d\n", f(i + j));
   printf(" g = %d\n", g(&i));
   i = i + 3;
   printf(" g = %d\n", g(&i));
   printf(" g = %d\n", g(&j));
   printf(" i = %d j = %d\n", i, j);
   return 0;
} 

Problem 5

What gets printed?


#include < stdio.h>


int rec (int i)
{
   int j = 0;

   printf ("%d\n",i);
   if (i > 2) 
      j = rec(i - 2) + 1; 
   else 
      j = i; 
   printf("%d\n", j);
   return j; 
}

int main(void)
{ 
   rec(5); 
   return 0;
}

Problem 6

What gets printed?

#include < stdio.h> 
void swap (int *m, int *n)
{ 
   int temp = *m;
    
   *m = *n; 
   *n = temp;
} 

int main (void) 
{
   int a[4] = {2,7,4,8};
   int i, j;

   for (i = 3; i > 0; --i) { 
      for (j = 0; j < i; ++j)
         if (a[j] < a[j+1])
            swap (&a[j], &a[j+1]); 
      for (j = 0; j < 4; ++j) 
         printf ("%d ",a[j]);
      printf ("\n");
   }
   return 0;
}

Problem 7

What gets printed?

#include < stdio.h>

void func1(int a, int b) 
{
   static int count = 0;

   count += a + b; 
   a += b;
   printf ("%d %d %d\n", a, b, count);
}

void func2(int *a, int *b) 
{
   int count = 0;

   count += *a + *b;
   *a += *b;
   printf ("%d %d %d\n", *a, *b, count);
}

int main(void)
{	
   int i=2, j=3;

   func1 (i,j);
   printf("%d %d\n", i, j);
   func2 (&i,&j);
   printf("%d %d\n", i, j);
   func1 (i,j);
   return 0;
}

Problem 8

What gets printed?

#include < stdio.h>
#include < string.h>

int main(void)
{
   char *s1, *s2, *s3;
   char s4[20] = "bedroom";

   s1 = "bedroom tray fire";
   s2 = "bedroom tray ashes";
   s3 = "bedroom tray";

   printf("%d is length of s1\n", strlen(s1));
   printf("%d is length of s4\n", strlen(s4));
   printf("%d is length of s3 offset\n", strlen(s3 + 2));
   printf("%d is s1 == s2\n", (strcmp(s1, s2) == 0));
   printf("%c %c \n", s4[3], s3[4]);
   return 0;
}

Problem 9

What gets printed?

#include < stdio.h>

int main(void)
{
   int i, j = 5;

   for (i = 0; i < 6; ++i) 
      switch (i % 4) {
      case 0:
         printf("%d\n", ++j);
         break;
      case 1:
         printf("%d\n", j++);
         break;
      case 2:
         printf("%d\n", j);
         break;
      case 3:
         printf("%d\n", --j);
      case 4:
         printf("%d\n", j);
         break;
      default:
         printf("error\n");
         break;
   }
   return 0;
}

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