dynamic-memory-allocation

I don't have much experience with QT and this problem came out today. QList<int> memList; const int large = 100000; getchar(); for (int i=0; i<large; i++) { memList.append(i); } cout << memList.size() << endl; getchar(); for (int i=0; i<large; i++) { memList.removeLast(); } cout << memList.size() << endl; getchar(); After first loop when I check memory usage it goes up as new elements are appended to the memList but after removing them within second loop the memory usage stays at the same level. I thought that QList was dynamic and it would free memory when element is removed. So either I'm

I have a problem with a project. I have to make a variable size 2D array for storing some prediction error..so this is about images. The trouble is that I have to load images of different sizes so for each image I would have to get into a file the 2D array with the coresponding number of pixels..I've searched among your questions but it's not what I'm looking for.Can anyone help me? Thank you If you have a modern C compiler (at least C99) in function scope it is as simple as: unsigned arr[n][m]; this is called a variable length array (VLA). It may have problems if the array is too large. So if

I am trying to read all content from a text file. Here is the code which I wrote. #include <stdio.h> #include <stdlib.h> #define PAGE_SIZE 1024 static char *readcontent(const char *filename) { char *fcontent = NULL, c; int index = 0, pagenum = 1; FILE *fp; fp = fopen(filename, "r"); if(fp) { while((c = getc(fp)) != EOF) { if(!fcontent || index == PAGE_SIZE) { fcontent = (char*) realloc(fcontent, PAGE_SIZE * pagenum + 1); ++pagenum; } fcontent[index++] = c; } fcontent[index] = '\0'; fclose(fp); } return fcontent; } static void freecontent(char *content) { if(content) { free(content); content =

I am doing an exercise for fun from KandR C programming book. The program is for finding the longest line from a set of lines entered by the user and then prints it. Here is what I have written (partially, some part is taken from the book directly):- #include <stdio.h> #include <stdlib.h> int MAXLINE = 10; int INCREMENT = 10; void copy(char longest[], char line[]){ int i=0; while((longest[i] = line[i]) != '\0'){ ++i; } } int _getline(char s[]){ int i,c; for(i=0; ((c=getchar())!=EOF && c!='\n'); i++){ if(i == MAXLINE - 1){ s = (char*)realloc(s,MAXLINE + INCREMENT); if(s == NULL){ printf("%s",

I know how to create a array of dynamic objects. For example, the class name is Stock. Stock *stockArray[4]; for(int i = 0 ; i < 4;i++) { stockArray[i] = new Stock(); } How do you change this to dynamic array of dynamic objects? What I tried: Stock stockArrayPointer = new Stock stock[4]; It doesn't work and the error is "The value of Stock** cannot be used to initalize an entity of type Stock. Second question is after the creation of dynamic array of dynamic objects, what is the syntax to access the pointers in the array. Now, I use stockArray[i] = new Stock(); How will this change? Need some