C :: Sum Of Fourth Powers Of Numbers In Array

Dec 9, 2014

I want to have a program that will calculate the sum of the fourth powers of 100 real numbers in an array (numbers in this array are stated explicitly in the code), code I have for integers is working perfectly but i want it to work also for non integers.

Code:

#include "stdafx.h"
#include "math.h"
int sum_array(int a[], int numelements) {
long double i, sum = 0;
for (i = 0; i<numelements; i++) {
sum = sum + pow((float)a[i], (int)4);

[code]....

The error messages i have: return' : conversion from 'long double' to 'int', possible loss of data.

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C :: How To Write Powers Without Using Math

Sep 22, 2014

How would one write 3^i without using .math? (i being numbers 0-9)

More specifically, this is what I have:

Code:

#include <stdio.h>
#include <stdlib.h>
int main(void) {
int x, n, answer1, first;
x = 3;
n = 10;
first = 1;

[Code]....

And this is what I want it to produce:

1 0 1.0
3 1 0.333333343
9 2 0.111111112
27 3 0.037037037
81 4 0.012345679
243 5 0.004115226
729 6 0.001371742
2187 7 0.000457247
6561 8 0.000152416
19683 9 0.000050805

I believe I am only having troubles with the first column,

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C++ :: Print Out Integers Between 2 And 256 That Are Integer Powers Of 2

Nov 5, 2013

Using a do-while loop, for loop, or while loop. This is what I have so far but i don't know what to do after that.

#include <iostream>
using namespace std;
int main() {
int num;
int min = 2;
int max = 256;
}

Also the results should be printed out with 10 integers per line, right justified in a 5 byte field.

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C :: Create Function That Is Then Called To Calculate Powers

Nov 11, 2014

As I am taking my first steps in C, I study K&R (I guess most of you did the same, right?)

In the introductory chapter about functions (1.7) there is an example showing how to create a function that is then called to calculate powers (b**n). I simplified it to calculate only one given power, 2**5:

Code:

#include <stdio.h>
int power(int m, int n);
main() {
printf("%d", power(2,5));

[Code]....

It will then be called to make the calculation in the above string.

First things first: we already know how to use while(getchar!=EOF) to count characters (K&R chapter 1.5.2) but what if -instead- the input is a specific string? How to "read" it and how to tell my program that the string is finished? And most important: "reading" will be done in the function or in the rest of the body?

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C :: Program To Generate A List Of Powers Of 3 - Decimal Places?

Sep 23, 2014

So my assignment requires us to write a C program to generate a list of powers of 3 where each output line lists three numbers: k 3k 3‐k

It should look like this (just pretend all the numbers are lined up in their respective columns)

1 0 1.0
3 1 0.333333343
9 2 0.111111112
27 3 0.037037037
81 4 0.012345679
243 5 0.004115226
729 6 0.001371742
2187 7 0.000457247
6561 8 0.000152416
19683 9 0.000050805

This is what I keep getting:

1 0 1.000000000
3 1 0.333333343
9 2 0.111111112
27 3 0.037037037
81 4 0.012345679
243 5 0.004115226
729 6 0.001371742
2187 7 0.000457247
6561 8 0.000152416
19683 9 0.000050805

My input:

Code:
#include <stdio.h>
#include <stdlib.h>
void powers(void) {
int i=0;
int n=9;
int x=1;
float h=1;

[Code] .....

Notice how I'm getting 1.000000000 for my first h value in my output whereas I should be getting 1.0. What am I doing wrong?

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C++ :: Find Prime Numbers Between Given Pair Of Numbers And Store Them Into Array?

Apr 18, 2014

Find all the prime numbers between a given pair of numbers. Numbers should be read in from an input file called "numbers.txt" and find all the prime numbers between them. Store the prime numbers in an array, then sort the array from greatest to least. Display the array before and after the sort.

I'm stuck on how to put the prime numbers into an array.

The input file has the numbers 1 & 100.

Here's what I have so far.

#include <iostream>
#include <fstream>
using namespace std;
int main() {
ifstream fin;
fin.open("numbers.txt");

[Code] .....

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C :: Find Duplicate Numbers And Numbers Found Once In Array

Dec 7, 2013

Question: How to find a duplicate numbers and numbers found once in array.

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C/C++ :: Generate Combinations Of Numbers From 1 To 25 In 15 Numbers Array?

Sep 21, 2014

The code below will generate combinations of numbers from 1 to 25 in an 15 numbers array. The only filter I've applied is that the sum of all the numbers in the vectors divided by 15 needs to be between 13 and 14.
I would like to count how many consecutive numbers there are in one combination, so that later i can apply another filter.. for example:

1 3 4 5 6 8 10 13 14 16 17 18 19 20 25

3 + 4 = 1
4 + 5 = 1
5 + 6 = 1
13 + 14 = 1
16 + 17 = 1
17 + 18 = 1
18 + 19 = 1
19 + 20 = 1
_____________

Count = 8, in this case..

I think it's not very difficult to do, but i just can't see how to do it.

#include <iostream>
#include <vector>
#include <numeric>

[Code]....

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C++ :: Storing Numbers Into 2D Array - Invalid Types Int For Array Subscript

May 17, 2014

#include <iostream>
#include<fstream>
int decryption(int);
int multiply(int,int[][2]);
using namespace std;
main(){
int n;
ifstream inFile;
inFile.open ("out.txt");

[Code] .....

I was trying to store numbers read from a text file into 2D array but I am getting the error above.here is where the error occurs:

line 33: cout<<m[i][j]<<" ";

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C++ :: How To Count Same Numbers Once In Array

Jan 22, 2015

iam trying to count the same numbers in an array just once like

38
38
40
38
40
37

the output should be 2 since 38 is repeated and 40 too but for my code the output is 3 thats an example of how it should be in a nutshell i want same number to be counted just once in the whole array

and here's my code :

#include <iostream>
using namespace std;
int main(){

[Code].....

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C++ :: Array With Both Numbers And Alphabets

Aug 22, 2014

I am unable to create an array which has to content elements(1E, 2E, 3E, 4E). I tried using char however I am unable to display as it only shows the letter E.

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C++ :: Find GCD Of Array Of Numbers

Aug 25, 2013

I wrote this GCD function to find gcd of an array of numbers . Here is the code:

long long GCD(long long min,int loc,long long b[]) {
for (long long i=min;i>0;i--) {
bool p=0;
for (long long x=0;x<loc;x++) {
if (b[x]%i!=0)

[Code] ....

Its returning wrong answers. When i tried 6 14 it returns 6

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C/C++ :: Get Average Of Numbers In Array

Jul 5, 2014

I was trying to make a program that asks the number of grades, get the grades and then get the average. I know I have to save the grades in an array but i don't know exactly how.

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C :: Ignore Negative Numbers In Array

Feb 15, 2014

So i have this program that takes in user input and stores them into an array and then prints them, removes duplicates, and sorts in ascending order. The user can also stop by inputting a sentinel value (in this case -1). But i am also supposed to ignore any negative value besides -1. When i input any other negative value into the program it messes up. How would i go about ignoring the negative values?

Code:
#include<stdio.h>
int main()
{
int input, nums[20], i, j, k, temp, count=0, count2=0;
for(i=0;i<20;i++)

[Code] .....

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C :: Find Prime Numbers - How To Use Bit Array

Aug 19, 2013

I wrote some code for class to find prime numbers.The teacher says that I need to revise my code with the requirement below: use a bit array to store the prime number checking. The bit array will also be in the heap. Use the max value of an unsigned 32-bt integer (UINT_MAX) to be the maximum size of the prime number you want to check.

Code:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <getopt.h>
#include <ctype.h>
#include <stdint.h>

//function to set all non-primes to 0
void *zero_multiples(void *threadid);

[Code] .....

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C :: Store Random Numbers In Array

Jan 11, 2015

i cannot print the values stored in the array ?

Code:
#include<stdio.h>
#include<math.h>
#include<time.h>
#include<stdlib.h>
double randf();

[Code] ....

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C :: Enter 10 Positive Numbers In Array

Nov 3, 2014

I have task to make program.. To enter 10 positive numbers in an array. Find three numbers that stand near each other and that have the maximum sum.

I understand how to make array, enter 10 number i find only one biggest number from 10.. How to find three max number sum that stand near each other..

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C :: Changing Order Of Numbers In Array

Dec 10, 2014

I want to write a programm that will reverse the order of the numbers in an array (e.g. as an input 1,2,3.5,4 and as an output i want 4,3.5,2,1) . But i have to problems:

1) I do not know how to properly change the type of a numbers inside an array from int to float or double, changing int to float in front of the a[10], does not change anything instead the code does not want to compile then.

2) I also want to make an array of a number of elements typed by a user with use of a "do" loop and how to put this parameter in the code.

Here is my code:

Code:

// ConsoleApplication3.cpp : Defines the entry point for the console application.//
#include "stdafx.h"
int _tmain(int argc, _TCHAR* argv[]) {
int a[10], i, n;
int pom;
do {
printf("number of elements in an array a: n = ");

[Code]...

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C :: Assign Numbers In A Buffer To 2D Array

Jul 11, 2014

How to assign numbers stored in a buffer memory to a 2D array.

The data type is unsigned 16bit (unsigned short) integers and they are stored in a 16bit/2bytes*1280*1024=2621440 bytes memory. The pointer pBuffer is the starting address of the buffer. Now I initiated an array and then assign the numbers to the array.

Code:
unsigned frame[1280][1024];
for (int i=0;i<1024;i++){
for(int j=0;j<1280;j++){
frame[i][j]=(*(unsigned short*)pBuffer+1024*i+j);
printf("%u ", frame[i][j]);
}
printf("
");
}

Because I know the number in the memory, I know after running the code that the result gives me nonsense.

I tried frame[i][j]=(*(unsigned short*)pBuffer+1024*2*i+2*j);

Since I think the pointer needs to move 2 bytes at a time, but it still gives me nonsensical array back.

Am I using the wrong expression to assign the values?

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C++ :: How To Count Repeated Numbers In Array

Jan 30, 2015

So I already gave this a go and will post my code below. The question is about the last loop before the program cout's. i thought the count would keep track of the repeated numbers so i could display them but it does not. I italicized the loop i am referring to. or at least i tried to xD

#include <iostream>
#include <iomanip>
using namespace std;
int main() {
int inputs[30];
int numofloops;
int maxvalue = inputs[0];

[Code]...

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C++ :: From Array Of Integers Take Numbers That Occur Only Once

Jan 14, 2013

I am trying to find a way to do something like this:

input: 3 4 7 4 3 3 7
output: 3 4 7

So what I am trying to do is from an array of integers to take numbers that occur only once. If 3 is in that away I am trying to input it in a different array only once.

input: 8 3 2 9 8 9 2
output: 2 3 8 9

I cannot find a way to solve this, and I have been trying to solve it for a long time.

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C++ :: How To Convert Numbers From Char Array

Jan 27, 2015

i want to convert in loop for example this

char number[]="54465465445646848640";

and in loop convert these element to int one by one.

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C++ :: Accept Numbers From User Into Array?

Feb 7, 2015

I want to accept numbers from the user into an array and convert into corresponding alphabets. E.g 1 into A, 2 into B, and so on.

This is simple, but the problem is the user is supposed to enter the character # also which I want to display as it is in the output. How can I do this ? What type of array should be used - int or char?

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C++ :: Creating Array That Cycles Through Same Numbers?

Sep 13, 2013

How would one go about creating an array that cycles through the same numbers?

For example {0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,etc} for a chosen length?

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C++ :: Finding Mode Of Numbers In Array

Sep 9, 2013

I have to use numbers in my .txt file that are stored in an array. So i have to write a function to find the mode of the numbers in my array.

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C++ :: How To Make Array With A Range Of Numbers From 1 - 9 Only

Jan 29, 2013

I want to make an array with a range of number from 1-9 only. So if the user entered more than or less than the number indicated it will be error and ask the user to reinput the data. So far my code can be used to do so that if the user enter the number one by one... But if the user entered all the number in one shot the reentered value will be prompt to the back automatically for some reason...Let say 10,2,3,4 which was suppose to be 1,2,3,4 became 2,3,4,1 instead... here is the code:

#include<stdio.h>
void main() {
int num[4][4];
int row,col,x,y;
for(row=0;row<4;row++)

[Code] .....

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