4. # Tutorial reference that should be used together with this worksheet are:C & C++ program control 1 and C & C++ program control 2.

1. The following experiment should give the same result as the previous one. Only the logic has been rearranged. Complete the flowchart and the program so that the output is same as before.

#include<stdio.h>

int main(void)

{

int i, k, a = 0, b = 0, lower = 0;

printf("Enter the sample input line by line:\n");

for(i = 1; i <= 7; i = i + 1)

{

scanf_s("%d", &k, 1);

if(k < 90)

if(k < 80)

________________________________

else

________________________________

else

____________________________________

}

printf("A's = %d\tB's = %d\tLower = %d\n", a, b, lower);

return 0;

} if(k < 90)

if(k < 80)

lower = lower + 1;

else

b = b + 1;

else

a = a + 1;  1. Next, let us test the conditions for all five grades, namely A,B, C,D and F. In the blank space, for each grade, place the appropriate statement something like the following:

printf("A.\n");

Each else that is lined up under anif is that condition’s false side. Complete the code and the flowchart.

#include<stdio.h>

int main(void)

{

int i, k;

printf("Enter the sample input line by line:\n");

for(i = 1; i <= 7; i = i + 1)

{

scanf_s("%d", &k, 1);

if(k < 90)

if(k < 80)

if(k < 70)

if(k < 60)

____________________________

else

_____________________________

else

_____________________________

else

______________________________

else

____________________________

}

return 0;

}

if(k < 90)

if(k < 80)

if(k < 70)

if(k < 60)

else

else

else

else  The following is the completed flowchart. 1. On the F (false) side of k < 90? Only A grades are selected. On the T (true) side of that condition, which grades are selected, A, B, C, D and/or F?

2. On the T side of k < 80?, which grades are selected?

3. On the T side of k < 70?, which grades are selected? What about on the F side?

4. Grades that end up getting a B must go through how many decision diamonds?

5. Grades that end up getting a D must go through how many decision diamonds?

Ans:

1. B, C, D and F.

2. C, D and F.

3. On the True side are D and F. On the False side, C was selected.

4. 2 decision diamonds.

5. 4 decision diamonds.

1. The following experiment performs the same steps as in the previous one. However, since the logic is rearranged, the printf() will need to be placed at different locations. Complete the code and the flowchart.

#include<stdio.h>

int main(void)

{

int i, k;

printf("Enter the sample input line by line:\n");

for(i = 1; i <= 7; i = i + 1)

{

scanf_s("%d", &k, 1);

if(k > 69)

if(k > 89)

________________________

else if(k > 79)

________________________

else

__________________________

else if(k > 59)

__________________________

else

____________________________

}

return 0;

}

if(k > 69)

if(k > 89)

else if(k > 79)

else

else if(k > 59)

else  • The following is a completed flowchart for the previous question. 1. F grades will go through two conditions: k > 69?, which would be false and k > 59?, which also would be false. How many conditions that D grades go through?

2. How many conditions that C grades go through?

3. How many conditions that A grades go through?

4. If k > 79? were changed to k <= 80?, then what changes would be necessary in the flowchart?

5. When a grade that is read into the variable k enters this set of nested if’s, it has a choice of going through how many different paths?

6. The control of execution may take how many different paths at any one time?

Ans:

1. Also 2 conditions same as F but both are True.

2. 3 conditions.

3. 2 conditions.

4. The True (T) and False (F) positions need to be exchanged for the k > 79 decision diamond.

5. 5 different paths based on the path toward the Stop.

6. At any one time it will take 2 paths based on the True (T) and False (F) paths.

1. The following experiment performs the same steps as in the last two previous experiments. However, it count the number of grades in each category instead of printing them. Complete the code and the flowchart.

#include<stdio.h>

int main(void)

{

int i, k, a=0, b=0, c=0, d=0, f=0;

printf("Enter the sample input line by line:\n");

for(i = 1; i <= 7; i = i + 1)

{

// for older compiler you can try using scanf()

scanf_s("%d", &k, 1);

if(k <= 59)

____________________________

else if(k <= 89)

if(k <= 69)

_______________________________

else if(k <= 79)

_______________________________

else

_______________________________

else

_____________________________

}

printf("A's = %d\t", a);

printf("B's = %d\t", b);

printf("C's = %d\t", c);

printf("D's = %d\t", d);

printf("F's = %d\n", f);

return 0;

}

if(k <= 59)

f = f + 1;

else if(k <= 89)

if(k <= 69)

d = d + 1;

else if(k <= 79)

c = c + 1;

else

b = b + 1;

else

a = a + 1;

---------------------------------------------------------  • The following is the answer for the flowchart diagram. For each of these questions, choose from among the grades of A,B,C,D and F.

1. Which grades(s) are selected on the true side of k <= 59?

2. Which grades(s) are selected on the false side of k <= 59?

3. Which grades(s) are selected on the true side of k <= 89?

4. Which grades(s) are selected on the false side of k <= 89?

5. Which grades(s) are selected on the true side of k <= 69?

6. Which grades(s) are selected on the false side of k <= 69?

7. Which grades(s) are selected on the true side of k <= 79?

8. Which grades(s) are selected on the false side of k <= 79?

1. F.

2. A, B, C and D.

3. B, C and D.

4. A.

5. D.

6. B and C.

7. C.

8. B.

1. Run the following program and key in the following sample input (without the commas): 16,21,17, 43,7, 52,-1. The program will determine the smallest number entered.

#include<stdio.h>

int main(void)

{

int k, smallest;

printf("Enter integers, when");

printf(" done enter a ");

printf("negative number\n");

scanf_s("%d", &k, 1);

// assign the first number to smallest variable

smallest = k;

// iterate while k >= 0

for( ; k >= 0; )

{

// if the entered number is < smallest

if(k < smallest)

// then assign the number to smallest variable...

smallest = k;

scanf_s("%d", &k, 1);

}

// print the smallest number...

printf("The smallest number is %d\n", smallest);

return 0;

}

1. Draw a tracechart for this experiment (left to you!).

2. What was the first value of the variablesmallest?

3. The first time that the condition in the if statement was encountered, what were the values of k andsmallest?

4. The second time that the if condition was tested, what were the values of k and smallest?

5. The third time that the if condition was tested, what were the values of k and smallest?

6. During the loop, the value of smallest was changed. What were the different values of smallest?

7. Does an if statement require a corresponding else statement? Why?

8. Is the scanf_s() executed inside the loop when the k < smallest is true or false, or irrespective of it?

9. If the data entered were 11, 22, 13, 19, 16, -1, how many times would smallest be changed?

To see the flow of this program clearer and used for troubleshooting you can add several line of codes as shown below.

#include <stdio.h>

int main(void)

{

int k, smallest;

printf("Enter integers, when");

printf(" done enter a ");

printf("negative number\n");

scanf_s("%d", &k, 1);

// assign the first number to smallest variable

smallest = k;

printf("smallest = %d, k = %d at pos1.\n", smallest, k);

// iterate while k >= 0

for( ; k >= 0; )

{

// if the entered number is < smallest

printf("smallest = %d, k = %d at pos2.\n", smallest, k);

if(k < smallest)

// then assign the number to smallest variable...

smallest = k;

printf("smallest = %d, k = %d at pos3.\n", smallest, k);

scanf_s("%d", &k, 1);

printf("smallest = %d, k = %d at pos4.\n", smallest, k);

}

// print the smallest number...

printf("The smallest number is %d\n", smallest);

return 0;

}

// Sample inputs: 16, 21, 17, 43, 7, 52, -1 and 11, 22, 13, 19, 16, -1  2. 16

3. k = 16, smallest =16.

4. k = 21, smallest = 16.

5. k = 17, smallest = 16.

6. 16 and 7.

7. Not really. It can be standalone in testing just a condition.

8. From the flowchart we can see that the scanf_s() executed inside the loop irrespective of k < smallest is True or False.

9. 0 time. It is already a smallest number entered as the first input. 