Output prediction cannot understand the while statement

while loop
python while loop multiple conditions
while loop python
while loop example
do while loop
how to end a while loop
for loop
python while loop break

I'm looking for the expalanation of this problem. I cannot understand the while part and why does it print 6.

#include <stdio.h>

int main() 
    int array[] = {1, 2, 4, 0, 4, 0, 3};
    int *p, sum = 0;

    p = &array[0];

    while (*p++)
        sum += *p;

    printf("%d\n", sum);
    return 0;

This is a more readable form of your while loop:

while (*p != 0)
  p = p + 1;   // you can put "p++;" here, which has the same effect
  sum += *p;

Now you should understand on your own.

Loops: while(), for() and do .. while(), The while() loop repeats as long as the condition is true (non-zero). writing a program we often don't know if there will always be something to loop over and it would Understanding the increment is critical to understanding the loop. Add some debugging output to your previous loop; To demonstrate some debugging. Problem Statement & Description. The dataset was collected from a Combined Cycle Power Plant over 6 years (2006-2011) when the power plant was set to work with a full load. . Features consist of hourly average ambient variables Temperature (T), Ambient Pressure (AP), Relative Humidity (RH), and Exhaust Vacuum (V) to predict the net hourly electrical energy output (PE) of the plant.A combined

Initially the pointer p points to the first element of the array.

p = &array[0];

However after evaluation the condition of the while statement


the pointer was incremented and after that it points to the second element of the array that is to 2.

Within the body of the loop there is used the incremented pointer.

So you will have

2 + 4

The forth element of the array is equal to 0. So the loop stops its iterations.

You can consider the condition in the while loop the following way if to rewrite it as a for loop

#include <stdio.h>

int main(void) 
     int array[] = {1,2,4,0,4,0,3};
    int *p, sum=0;
    p = &array[0];

    for ( int *tmp = p; ( ++p, *tmp != 0 ); tmp = p )
        sum += *p;


    return 0;

If within the body to use the statement

sum += *tmp;

instead of

sum += *p;

then you will get the expected result equal to 7.

3.3. While Statements — Hands-on Python Tutorial for Python 3, A Python while loop behaves quite similarly to common English usage. Predict what will happen with this slight variation on the previous example, switching the There is an issue with reading in numbers with the input statement. If you make a typo and enter something that cannot be converted from a string to the right� While Loop. Sometimes you want everything in the program to stop while a given condition is true. You can do this using a while loop. This example shows how to use a while loop to calibrate the value of an analog sensor. In the main loop, the sketch below reads the value of a photoresistor on analog pin 0 and uses it to fade an LED on pin 9.

you are discarding the value from first element of array.

that is the reason why you see answer 6

you sum elements after you already moved to the next element of array

you should increment pointer in the end of iteration

  sum += *p;


for( ; *p ; p++){
  sum += *p;

7. Iteration — How to Think Like a Computer Scientist: Learning with , But in this chapter we've going to look at the while statement — another way to have Each time through the loop, the program outputs the value of n and then checks This development plan is particularly useful if you don't know how to divide the This is an example of an indefinite iteration problem: we cannot predict in� The most basic control flow statement supported by the Java programming language is the if-then statement. The switch statement allows for any number of possible execution paths. The do-while statement is similar to the while statement, but evaluates its expression at the bottom of the loop.

The loop runs until it encounters a zero value. However you increment your pointer before adding what it points to, to "sum".

So the loop adds the second and third elements to sum and stops at the fourth.

The value of sum is then: 0 + 2 + 4 = 6

Loops - For and While — AP CS Principles, Before you step through the code in for_counter below, try to predict the last value it will print and then Print output (drag lower right corner to resize) While loops are typically used when you don't know how many times to execute the loop. Linear regression is not the appropriate type of model to use for this type of problem. Look up binary prediction classifiers - such as logistic regression. In that, calling predict() will give you the class prediction. – pault Jan 15 '18 at 14:19

Just modify your while loop as

sum += *p++;


++, –– are unary operators used to increment, decrement the value of a variable by 1.

They can be used as postfix or prefix

But this was not just your problem. While loop terminated when it receives 0. Your array contains one of it.

So, instead use

for(int i=0;i<7;i++)  //7 -> size of array
sum += *p++;

o/p - 14

[PDF] Chapter 155 to implement while and for loops to hand-trace the , You now know how to create and update the variables in Python. What you don't 160 Chapter 4 Loops table 1 while Loop examples. Loop output explanation i = 0 total = 0 You don't need a working program to do hand-tracing. You can Many events in the real world are difficult to predict with absolute precision, yet we. I found the same in SSMS 2008 R2 if the output is set to grid, as my query did not have any results. Therefore you don't get output displayed until the end. However, if you change the output to Text, or use the Window->Next Pane (F6) menu, you should see the output as it is created.

Output of Java Programs, Explanation: In the above example there is a syntax error of do-while loop. As we all know that without curly braces we can take a statement which cannot be� Given any problem statement, follow this pipeline so that your approach is structured. Define the problem - Write down the problem statement and understand what you’re trying to solve. In this case, our objective is to predict whether a student will get an admit or not. So it means, that this is a binary classification problem. 2.

Output of Java Programs, Explanation: Initialization part of the for loop will be executed only once in the for time error saying error: incompatible types: String cannot be converted to int. 4) The while loop has two important parts: an expression that is tested for a true or false value, and: A) a statement or block that is repeated as long as the expression is true B) a statement or block that is repeated only if the expression is false C) one line of code that is repeated once, if the expression is true

Loops: while and for, For instance, the loop below outputs i while i < 3 : For example, we can omit begin if we don't need to do anything at the loop start. Like here:. In a sentinel-controlled while loop, the body of the loop continues to execute until the EOF symbol is read. True The control variable in a flag-controlled while loop is a bool variable.

  • Any non-zero number is true condition. Thus your loop runs till first 0.
  • For your own sake (and ours too) please invest a minute or two of your time and format your code
  • the root cause of the problem is the ignoring of the C operator precedence, where the ++ will be performed, then the dereference