Homework Help: C programming

Posted by E on Saturday, October 2, 2010 at 7:49pm.

Question: Write a program that reads integers from the keyboard until the user enters the sentinel value -999. The program should then print the minimum integer read, the maximum integer read and the average of all the integers. (Excluding the sentinel value -999)

I know how to post maxes & mins and set the sentinel value. I don't know how to tell the computer to sum up the values given and take the average since I need a generic function that would work for any number of values.

My code for everything else:

#include <stdio.h>

int main()
{

int num;
int min;
int max;
int avg;

printf("Enter a number (-999 to quit): ");
scanf("%d",&num);

//putting the first number the user entered in variable min and max
min = num;
max = num;

while(num!=-999)
{
if(num<min)
{
min = num;
}

if(num>max)
{
max = num;
}
printf("Enter another number (-999 to quit): ");
scanf("%d",&num);
}

printf("\nThe smallest number entered is %d\n",min);
printf("\nThe largest number entered is %d\n",max);

return 0;
}

C programming - MathMate, Saturday, October 2, 2010 at 11:09pm
The program has a good skeleton and observes many good practices such as declaring the variables before first use (or else it won't compile), initializing variables min and max after first scanf, etc.

To calculate the total and average, you need to:
add variables count and total.
Count should be set to one at the same time as max=num, total should be set to num at the same time.

Inside the while loop, increment count by one and increment total by num whenever num!=-999.

After the execution exits the loop, the total will represent the total of the numbers, and avg(should have been declared as float) can be calculated using:

avg=(float)(total)/count;

Give it a try and post what you've got. You should not be far from finishing it.
C programming - Anonymous, Monday, October 4, 2010 at 12:48am
"Inside the while loop, increment count by one and increment total by num whenever num!=-999."

Where exactly inside the loop should I do this and how?
Do I say count++
to increment count by one, and do I say
total = total+num
inside the while loop to increment total and if so where?

This program runs but I can't get the correct mean average value:

int main()
{
//Variable declarations
int num;
int min;
int max;
float avg;
int count;
int total;

printf("Enter a number (-999 to quit): ");
scanf("%d",&num);

min = num;
max = num;
count = 1;
total = num;

until the user enters -999

while(num!=-999)
{
count++;
total = num;

if(num<min)
{
min = num;
}

if(num>max)
{
max = num;
}
avg = total/count;
printf("Enter another number (-999 to quit): ");
scanf("%d",&num);
}

printf("\nThe smallest number entered is %d\n",min);
printf("\nThe largest number entered is %d\n",max);
printf("\nThe mean average value is %f\n",avg);

//Exit program
return 0;
}
C programming - justy, Saturday, September 17, 2011 at 8:35am
Functions... how to pass value from one function to the next... using different methods

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