realloc

If the area pointed to was moved, a free(ptr) is done. Can you please explain the above line about realloc() ? This line is from a man page for calloc, malloc, realloc and free. I think this explains it better: If sufficient space does not exist to expand the current block in its current location, a new block of the size for size is allocated, and existing data is copied from the old block to the beginning of the new block. The old block is freed, and the function returns a pointer to the new block. Reference taken from realloc in C Let's say you have the following heap layouts. This is a

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 apologize for the lengthy code. I have a simple question, but I thought I include my code so it will be clear where I am coming from. I get a realloc corruption. I think the corruption is because I am not freeing correctly. In reality I am not sure what glibc even says or means. Can any one briefly explain that to me? Again sorry for the lengthy code. #include "draw2.h" #include "draw2a.h" #include "draw2b.h" const char Exec_c[] = "java -jar Sketchpad.jar"; void parseFile(FILE * fp, FILE *sketcher){ char line [MAX_WORD] = {"NULL"}; char word [MAX_WORD] = {"NULL"}; char figureName [MAX_WORD]

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying figure out what size to send "realloc" when I call it through Swift. It seems that I have to add an extra byte , but I don't understand why. typealias Floats = UnsafeMutablePointer<Float> let FLOAT_SIZE = sizeof( Float ) func floats_realloc( floats:Floats, qty_of_floats:Int ) -> Floats { let KLUDGE = 1 // Why? let qty_of_bytes = ( qty_of_floats * FLOAT_SIZE ) + KLUDGE let realloced_floats = Floats( realloc( floats, UInt( qty_of_bytes ) ) ) return realloced_floats } If I set KLUDGE to 0 here, this is what happens when I attempt to

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: If the area pointed to was moved, a free(ptr) is done. Can you please explain the above line about realloc() ? This line is from a man page for calloc, malloc, realloc and free. 回答1: I think this explains it better: If sufficient space does not exist to expand the current block in its current location, a new block of the size for size is allocated, and existing data is copied from the old block to the beginning of the new block. The old block is freed, and the function returns a pointer to the new block. Reference taken from

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Look at the code: #include<stdio.h> #include<stdlib.h> void main() { int *p; p = malloc(6); p = realloc(p, 10); if (p == NULL) { printf("error"); exit(1); } } Take this example for the code, suppose the total memory is 10 bytes and 2 bytes is used by the declaration of pointer to type int and ohter 6 bytes by malloc function the remaining 2 bytes is occupied by other programs, now when i run realloc function to extend the memory that pointer is pointing to, it will search for 10 bytes in memory and when it is not available it allocates 10

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: If I don't know how long the word is, I cannot write char m[6]; , The length of the word is maybe ten or twenty long. How can I use scanf to get input from the keyboard? #include <stdio.h> int main(void) { char m[6]; printf("please input a string with length=5\n"); scanf("%s",&m); printf("this is the string: %s\n", m); return 0; } please input a string with lenght=5 hello this is the string: hello 回答1: Enter while securing an area dynamically E.G. #include <stdio.h> #include <stdlib.h> char *inputString(FILE* fp, size_t size){ //The size is

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: #include <stdlib.h> #include <stdio.h> #include <string.h> int temp ; int main () { FILE * fp ; fp = fopen ( "input2.txt" , "r" ); //Open the input int counter = 0 ; int realloc_counter = 10 ; int * line_array ; //Initialize the array line_array = malloc ( 10 * sizeof ( int )); //Allocate memory for initial ten numbers, of size int for each while ( fscanf ( fp , "%d" , & temp ) > 0 ) { line_array [ counter ] = temp ; counter ++; if ( counter % 10 == 0 ) { realloc_counter = realloc_counter * 2 ; line_array = realloc ( line_array ,