Review Questions

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Review Questions

1. Find the value of quack after each line.

    int quack = 2; quack += 5; quack *= 10; quack -= 6; quack /= 8; quack %;= 3; 

2. What output would the following loop produce?

    for ( value = 36; value > 0; value /=2)       printf("%3d", value); 

3. Represent each of the following test conditions:

   1. x is greater than 5 .

   2. scanf() attempts to read a single double (called x) and fails.

   3. x has the value 5 .

4. Represent each of the following test conditions:

   1. scanf() succeeds in reading a single integer __________________________

   2. x is not 5 ____________________

   3. x is 20 or greater ___________________________

5. You suspect that the following program is not perfect. What errors can you find?

    #include <stdio.h> int main(void) {                                                        /* line 3  */   int i, j, list(10);                                    /* line 4  */   for (i = 1, i <= 10,  i++)                          /* line 6  */   {                                                      /* line 7  */       list[i] = 2*i + 3;                                 /* line 8  */       for (j = 1, j > = i, j++)                          /* line 9  */           printf("%d", list[j]);                         /* line 10 */       printf("\n");                                      /* line 11 */ }                                                        /* line 12 */ 

6. Use nested loops to write a program that produces this pattern:

    $$$$$$$$ $$$$$$$$ $$$$$$$$ $$$$$$$$ 

7. What will each of the following programs print?

   1.  #include <stdio.h>    int main(void)    {        int i = 0;        while (++i < 4)           printf("Hi! ");        do           printf("Bye! ");        while (i++ ;lt 8);        return 0; } 

   2.  #include <stdio.h> int main(void) {      int i;      char ch;      for (i = 0, ch = 'A'; i < 4; i++, ch += 2 * i)             printf("%c", ch);         return 0; } 

8. Given the input "Saddle up my charger!" , what would each of the following programs produce for output? (The ! follows the space character in the ASCII sequence.)

   1.  #include <stdio.h> int main(void) {     char ch;     scanf("%c", &ch);     while ( ch != 'g' )     {          printf("%c", ch);          scanf("%c", &ch);     }     return 0;} 

   2.  #include <stdio.h> int main(void) {     char ch;     scanf("%c", &ch);     while ( ch != 'g' )     {          printf("%c", ++ch);          scanf("%c", &ch);     }     return 0; } 

   3.  #include <stdio.h> int main(void) {     char ch;     do {          scanf("%c", &ch);          printf("%c", ch);     } while ( ch != 'g' );     return 0; } 

   4.  #include <stdio.h> int main(void) {     char ch;     scanf("%c", &ch);     for ( ch = '$'; ch != 'g'; scanf("%c", &ch) )           putchar(ch);     return 0; } 

9. What will the following program print?

    #include <stdio.h> int main(void) {      int n, m;      n = 10;      while (++n <= 13)           printf("%d",n);      do           printf("%d",n);      while (++n <= 12);      printf("\n***\n");      for (n = 1; n*n < 60; n +=3)           printf("%d\n", n);      printf("\n***\n");      for (n = 1, m = 5; n < m; n *= 2, m+= 2)           printf("%d %d\n", n, m);      printf("\n***\n");      for (n = 4; n < 0; n--)      {           for (m = 0; m <= n; m++)                printf("+");           printf("\n");      }      return 0; } 

10. Consider the following declaration:

     double mint[10]; 

    1. What is the array name ? ______________

    2. How many elements does the array have? _________________

    3. What kind of value can be stored in each element? ____________

    4. Which of the following is a correct usage of scanf() with this array?

       1. scanf("%lf", mint)

       2. scanf("%lf", mint[2])

       3. scanf("%lf", &mint[2])

       4. scanf("%lf", &mint)

11. Mr. Noah likes counting by twos , so he's written the following program to create an array and to fill it with the integers 2, 4, 6, 8, and so on. What, if anything, is wrong with this program?

     #include <stdio.h> #define SIZE 8 int main(void) {   int by_twos[SIZE];   int index;   for (index = 1; index <= SIZE; index++)        by_twos[index] = 2 * index;   for (index = 1; index <= SIZE; index++)        printf("%d ", by_twos);   printf("\n");   return 0; } 

12. You want to write a function that returns a long value. What should your definition of the function include?

13. Define a function that takes an int argument and that returns, as a long , the square of that value.

14. What will the following program print?

     #include <stdio.h> int main(void) {    int k;    for(k = 1, printf("%d: Hi!\n", k); printf("k = %d\n",k),        k*k < 26; k+=2, printf("Now k is %d\n", k) )            printf("k is %d in the loop\n",k);    return 0; } 

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