I need to store the following strings in 3 char * variables in C: [foo] [foo]:[bar] [foo]:[bar]:[tat] Each individual string such as "foo" is received at one point of time via a char* pointer, the corresponding output string is produced immediately before receiving the second string, and the total number of individual strings is known...
#include "stdio.h" #include "conio.h" void swap(int *x,int *y); void main() { int a=10,b=20; swap(a,b); printf("value of a=%d and b=%d"); getch(); } void swap(int *x,int *y) { if(x!=y) { *x ^= *y; *y ^= *x; *x ^= *y; } } // I'm getting .. cann't convert int to int * ... can anybody tell me why ...
I wrote a code to read files What is wrong in the following code I am always getting last filename if I print any arrayItem #include <stdio.h> #include <string.h> char **get_files() { FILE *fp; int status; char file[1000]; char **files = NULL; int i = 0; /* Open the command for reading. */ fp = popen("ls"...
Is the Linker part of the Operating System or the Compiler/IDE? ...
I had a similar question here about allocating and initializing one pointer to struct in a subfunction. Unfortunately I can't extend the good solution I got there to initialize an array of structs. The first element is OK but the second (and all following) elements are zero/NULL. Here is a commented example. Maybe someone can help me......
This was prompted by some experimenting with C/C++; neither the statement printf("\a"); nor the statement cout << "\a"; produce an audible bell sound. How is the \a supposed to function . . . ...
I want to write a C program that will sample something every second (an extension to screen). I can't do it in a loop since screen waits for the program to terminate every time, and I have to access the previous sample in every execution. Is saving the value in a file really my best bet? ...
I'm making a 3D FPS with OpenGL and here is the basics of how it works. The game is a 3D array of cubes. I know the location of the player's current cube, aswell as the camera x,y,z and I know the x, y, z rotation of the camera too. Right now I just make a square around the player and render this and then add distant fog. The problem tho...
I know that OS kernels are made up of drivers, but how does the driver become a part of the os?, does the kernel decompile itself, and then add the driver and recompile itself?, or are the drivers plug-ins for the kernel?, someone told me that for most operating systems, the drivers actually become a part of the kernel, but whenever I co...
So, I've got the following code (C): char c = getc(in); if (c == '(') ... if (c == '%') ... if (isdigit(c)) { int n; ungetc(c, in); scanf("%i", &n); ... } Everything is all fine and dandy when I'm reading in input from stdin but, when reading in input from from a file, the call to scanf does not terminate. I added s...
I am trying to understand the assembly level code for a simple C program by inspecting it with gdb's disassembler. Following is the C code: #include <stdio.h> void function(int a, int b, int c) { char buffer1[5]; char buffer2[10]; } void main() { function(1,2,3); } Following is the disassembly code for both main and functio...
Hi, I learned that memset(ptr, 0, nbytes) is really fast, but is there a faster way (at least on x86)? I assume that memset uses mov, however when zeroing memory most compilers use xor as it's faster, correct? Also I asked a person who knew of assembler more than me to look at the stdlib, and he told me that on x86 memset is not taki...
Hello, Does anyone know how I can add a progress bar to a listview cell using "pure" api. The only examples I've found are either in c# or outdated mfc ...
As far as I can tell, asprintf calls malloc. If I replace malloc with the Boehm GC, a call to asprintf still calls the traditional malloc - at least that's what valgrind is telling me: Here's the malloc macro: #include <stdio.h> #include <string.h> #include <stdlib.h> #include <stdbool.h> #include <gc.h> #define malloc(n) GC_MALLO...
More than likely a rookie question, but I'm looking for a printf-esque function for use in send over TCP sockets. This is for a simple chat server, specifically a modified version of the one in Beej's socket guide. I'm prepared to write my own, but before I do I want to make sure I'm not reinventing the wheel. I'm looking for something ...
Can someone explain why I can do: int x[4] = { 0, 1, 2, 3 }; int *p = x; But cannot do: int x[2][2] = { 0, 1, 2, 3 }; int **p = x; Is there a way to be able to assign to **p the x[][]? TIA ...
Whilst reading through K&R, I came across the integer to string function. I gave it a quick read, and decided to implement it myself, but instead of printing, it updates a character array. Here is what I have void inttostr(int number, char str[]) { static int i; if (number / 10) { inttostr(number / 10, str); } ...
hi. i have this code (im working with big files support in ansi c) unsigned long int tmp,final final=1231123123123213 tmp=final; printf("%llu %llu \n",final,tmp); printf("%llu \n ",tmp); it prints 1231123123123213 0 1231123123123213 i dont get it ...
Why do I get the wrong values when I print a int using printf("%f, myNumber) ? I don't understand why it prints fine with %d, but not with %f. Shouldn't it just add extra zeros? int a = 1; int b = 10; int c = 100; int d = 1000; int e = 10000; printf("%d %d %d %d %d\n", a, b, c, d, e); //prints fine printf("%f %f %f %f %f\n", a, b, c...
I am developing a project in C++. I realised that my program is not OO. I have a main.cpp, and several headers for different purposes. Each header is basically a collection of related functions with some global variables to retain data. I also have a windowing.h for managing windows. This contains the winMain() and winProc(). It calls t...