C :: Allocate Dynamically A Vector If Input Of User Exceeds 5 Times
Jan 31, 2013
i don't understand why this program crash if i'll insert a number more of 5 times... i want to allocate dynamically a vector if the input of the user exceeds 5 times... this is the code:
Code:
#include <stdio.h>
#include <stdlib.h>
int main()
{
int * vettore, n;
unsigned int len=1;
}
I CANT use std::string, classes, constructors for this project. I am required to use this archaic method of c-style strings with dynamic memory allocation occurring outside the struct.. i know its not the best way to go about this, but there's nothing i can go. I have a struct:
struct card { char *suit; char *rank; int cvalue; }
I've created a pointer of size 52 for my deck
card *deckPtr = new card[52]; card *deckHome = &deckPtr[0];
I then try to use
for(int i=0;i<52;i++) { (*deckPtr).suit = new char[8]; (*deckPtr).rank = new char[7]; deckPtr++ } deckPtr=deckHome;
I am essentially trying to fill in these arrays from a card file, but I cannot make it past running the program, i get sa seg fault which I dont understand why.
I dynamically allocate memory in my card read in function..
Write a program that dynamically allocates an array large enough to hold a user-defined number of test scores. Once all the scores are entered by the user, the array must be passed to a function that sorts them in ascending order. It must use another function that calculates the average score. The program should display the sorted list of scores and average with appropriate headings. The program must use pointer notation instead of array notation. Validation: Do not accept negative numbers for test scores; keep prompting the user for a new grade. Do not accept negative numbers for the number of scores the user wants to enter.
#include <iostream> #include <iomanip> using namespace std; // Function prototypes double getAverage(int*, int); void sortScore(int *,int );
[Code] ....
I have no errors in my code but when i run it and i enter a positive interger it just goes into a loop to enter a positive number.
For example, to calculate GPA, we add all the grade point of a course and divide by the number of courses we are taking. How do I create a program in such a way that when the user enters grade point for two courses, it will add the grade points for the two course and divide by 2. And if another user enters grade points for six courses, it adds the grade points and divides by 6.
but when I print the output using something like this:
outfile << "Owner Name: " << name << endl; outfile << "Address: " << street << city << endl;
(let's pretend I included spaces between the address components, which I omitted to save space)
I get an output file of:
Owner Name: John Smith Address:
The output stops after the name variable, which I believe is stored correctly. I don't think anything is storing in the address pieces, this is the problem.
I think it's because I'm not using getline() properly in this case. Can you string together multiple getline()s like that?
If this was my design, I'd read in strings instead, but that is not possible in this case.
My question, What happens when with the 32 bit register value exceeds 4 bytes while programming in c++? Im interested in encryption.
Im programming and doing some calculations. The hex value "0xFA062F2F" multiplied by "6D" sends it over "0x6A74A21703", which exceeds 32bit.
My problem is while programming in C++, I do some calculations such as above, and I get the hex value "0xC0000001" which should be "0x6A74A21703". I made sure that I use long long as my interger type.
this is my function for allocating memory in 2D array
Code:
#include <stdio.h> #include <stdlib.h> int allocate_array(int **array, int *row, int *column){ int i; }
[code]....
end of allocate_array function and this is my function for asking for the values to be stored in array
Code:
int input_array(int **array, int row, int column){ int i, j; //ask for the values to be stored in the 2D array for( i = 0; i < row; i++ ){ for( j = 0; j < column; j++ ){ }
[code]....
why I'm having error here in my input_array() function
In this program what i'm doing is to search for a number when the vector is in order, and count how many times that number appears, the problem is that count how many times the number does not appear, but when its appear the program stays in an "standby mode" and the cursor does not move.
int buscarNumOrdenado (int x [MAX]) //MAX is the define { int num,d, LimiteInferior, LimiteSuperior,mitad; d=0; LimiteInferior = 0; LimiteSuperior = MAX-1;
I am making program that allows the user to determine how big the array size will be and then asks the user to make up numbers to fill the array. Every time run the program on Dev C++ it says "program has stopped working"
Heres My Code:
//Assignment 19 Program 2 #include <iostream> using namespace std; int main()
I am trying to write a program that counts specific words that a user inputs "Howdy/howdy/Whoop/whoop" (yes I go to Texas A&M, hence those specific words) I am having an issue where it wont count the first word even if it is "Howdy"
For example if I put it:
"Howdy howdy whoop Whoop" - it only outputs that it counted 3 words
now if I were to do:
"Hello Howdy howdy whoop Whoop" - it would count 4.
Code:
#include "std_lib_facilities_4.h" int main(){ cout << "Please enter desired words, when you have entered all words, please type CTRL+d (EOF Command) " << endl; //It was assumed that EOF command was going to be used here hence the necessity of 'CTRL+d' vector<string>words;
I'm trying to increment the values in a vector, not the vector size, based on variable input. Basically I have a vector of size 10, and all of its values are initialized at zero. The program counts the frequency of numbers 0-9 in a four digit user input. This is what I have (I want it to work so badly but the compiler says that I'm using a pointer to a function used in arithmetic):
for (int i=0; i < num_slots; ++i) { ++guess_frequency[guess[i]]; }
I just want to know if you can increment values within a vector:
I'm currently learning templates -- & my logic is in a knot with what I am trying to do which is the following:
-Create a function name load -Accepts a filename (the filename is a text file of integers) -Open the file -Create an array(dynamically allocating an array) filling it with the elements read in from the file & returns the array(so that the return type of the array is a pointer to the element type of the array).
//Header file: #ifndef BUBBLE_SORT_H #define BUBBLE_SORT_H #include <iostream> template <typename T> void load(std::string filename, T *&arr, int *size);
[code].....
how to allocate memory when it comes to using templates..
I am trying to make a function that allows me to allocate memory to a "mem" variable and setting each of its chunk's status to FREE. FREE is defined as 0. Below is my code of the function.
Code:
int allocate(mem *mm, int num_chunks, int chunk_size) { int i; mem *temp; if((mm = (mem *) malloc((num_chunks + 1) * chunk_size)) == NULL){ perror("Failed to Malloc
[code]...
mem; If my function works the way it should, it should print out five 0 because that is how I set them in the function, but this is not the case. I've looked at my function for 2 hours, but I could not figure out any logical error. Now, I think my problem lies with my limited knowledge of pointer arithmetic. On the other hand, when I insert 1000 as the second argument into my function, it gives seg faults, which is not the case for smaller values like 5, 10, 15, etc.
I’m writing an application for raw image processing but I cannot allocate the necessary block of memory, the following simple code gives me an allocation error.
double (*test)[4]; int block = 32747520; test = new double[block][4];
off course with smaller block size (i.e. int block = 327475;) it works fine. Is there an allocation limit? How it is possible to deal with big blocks of memory?