18,491 Topics
I have problems in decrypting the text using AES in C. the code is belwo. [CODE]#include <stdlib.h> #include <openssl/evp.h> #include <string.h> int main(){ //declaring the variables char source[6]="Shahab"; char target[6]; char output[6]; char mykey[EVP_MAX_KEY_LENGTH]="hardtobreak"; char iv[EVP_MAX_IV_LENGTH] = "an_iv"; int in_len, out_len=0; int check; EVP_CIPHER_CTX ctx; in_len=strlen(source); printf("This is the text …
Hey, guys, to begin with, I'm a complete newbie to C and I'm writing a Knight Tour program. The idea of my program is to check every possible way (it is necessary for the assignment), so I start with x + 1 & y + 2 and so on. If …
Hi, all. Just been asked to help design a motion rig for a flight sim for a charitable museum in the UK. I have built robotic and control systems for a few years now mainly with PLC's some python and PICs. they are running Microsoft FS2004, and there is a …
Hello using conditional operators I want to make a program that ask user to input three values and print the maximum among those three values. i have done for two values but dont know the logic for three values. [CODE] int main(void) { int a,b,c,d; printf ("first value"); scanf ("%d",&a); …
How can i convert this pr0gram in conditi0nal operat0rs...? I don't kn0w h0w to use more than tw0 conditi0ns in c0nditi0nal 0perat0rs. We've learned to use two conditional operators conditions s0 far, for example, [iCODE] (a>b)? a:b ; [/iCODE] but don't kn0w how t0 apply it for 3 c0nditions ? …
program to calculate number of spaces in the string
Hi all Could someone please explain this program to me, especially lines 25 and 30. I understand that line 30 is a for loop and I understand how it works. However, I am unclear why it is minusing 3 from n and is n the variable passed from line 14? …
The prototype for setsockopt is: [CODE]int setsockopt(int socket, int level, int option_name, const void *option_value, socklen_t option_len);[/CODE] Are the following all correct ? Which are not ? [CODE]int buffsize = 50000; setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&buffsize, sizeof(buffsize));[/CODE] [CODE]int buffsize = 50000; setsockopt(s, SOL_SOCKET, SO_RCVBUF, (void *)&buffsize, sizeof(buffsize));[/CODE] [CODE]char *buffsize = …
For example i have an array like: a[20]={1,5,7,8,4,3,12,15,15,15,11,...} lets say that the max Value of this array is 15. i want to write : "The max value of array a is 15 and it is located at 8th,9th and 10th element in array. " Is it possible to write a …
i know the general answer to using [ICODE]goto[/ICODE] is always "No!". I understand why, especially when teaching basics to new programmers, because it can lead to very bad practices and horrible spaghetti code. but ... when i write certain hardware drivers, i have to immediately cease executing a function if …
I am doing some AES encryption using C. But the errors ocurred. The code is following by the error displayed. 1 Code [CODE]#include <stdlib.h> #include <openssl/evp.h> #include <string.h> int main(){ //declaring the variables char source[6]="Shahab"; char target[6]; char mykey[EVP_MAX_KEY_LENGTH]="hardtobreak"; char iv[EVP_MAX_IV_LENGTH] = "an_iv"; int in_len, out_len=0; int check; EVP_CIPHER_CTX ctx; …
Thanks for any help. Most of this works, but I get a compiler error on lines 60, 84, and 105, where it says [CODE] current = currentStore->link [/CODE] The error reads "assignment from incompatible pointer type" It runs, but in the printStores function when i gets incremented on line 81 …
hi how do I put words into a specified location of a 2d array using scanf? string movies[100][6]={}; in main i need at least 100 rows and 5 columns i want the user to enter the movie id, name year, type and availability it will be stored in a 2d …
hey guys where can i get some homework especially on writing C programs
I'm trying to write code for finding the number of same number in array. For example, in [1, 2, 3, 3, 4], the number of same number is 2. In [1, 2, 1, 3, 1], the number of same number is 3. How can I implement this? Please, help me.
I am making a linked list template. a can search a string input and determine if it is an int. i can declare a node of type int or string. when i try to add to my list, my string node cannot point to an int node and vice versa. …
[CODE]#include<stdio.h> #include<string.h> #define count 2000000 void add(char word[],char meaning[]) { FILE *fp; fp = fopen("words.txt","a"); fprintf(fp,"%s = %s\n",word,meaning); } void processing(void) { int i = 0,delay; printf("Processing....\n\n"); for(delay=0;delay<count;delay++) ; printf("\n"); } void getwords(void) { FILE *fp; fp = fopen("words.txt","r"); if(fp!=NULL) { printf("\n/**************************** DICITIONARY **********************************/\n\n\n"); char words; while((words = fgetc(fp)) != …
Hey so I'm trying to get one of my c variables to be a bash variable. Is there a way that I can do this?
Hi! As a physicist from Gothenburg, Sweden, I have been doing scientific programming for a couple of years, and I just start to get the grips about it. Daniweb is one of numerous forums I usually visit for tips about programming and operating system stuff. I am using: Ubuntu GNU/Linux, …
hi, all, Glad to see you guys here. It's Greeting from China mainland. Do you mind my introducing myself? I'm a switch driver engineer. I'm interesting in bios, firmware development using assembly and c language respectively. Say hi to you guys again.
I want to know what is const type in C and what is its uses etc. i dont know anything about this term used in C so please give detailed description...
Hi all, I'm trying to write the Hufmann code to encode a given file & give me the compression ratio. but when I run this programme, I'm getting segmentation fault. Can you please help me with correcting it ? [CODE] /*************************/ /*************************/ // HUFMANN.C /*************************/ /*************************/ #include<stdio.h> #include<stdlib.h> #include<input.h> #define …
[CODE]#include<stdio.h> #define SQR(x) x * x int main() { printf("%d", 225/SQR(15)); }[/CODE] why this program outputs 225 instead of 1 (according to calculation).
im using <stdio.h> and <conio.h> only is there any solution so I can randomize result? I want to make a fortune cookie that randomize the reading. i am not familiar with iostream and stdlib thanks
i have done a little project on a turbo c compiler with some graphics in it...my teachers don't want me to use turbo c..can u suggest which other compiler i can use to run my code.......
Hi all! So our T.A. gave us a function to use in our programming assignment as follows: [code=php] struct node *delete_from_list(struct node *list, int examnum) { struct node *cur, *prev; for (cur = list, prev = NULL; cur != NULL && cur->examNumber != examnum; prev = cur, cur =cur ->next) …
I'm trying to write my own system calls. I have a .c file where I'm putting the system calls. My system calls use a struct, so I have declared a global variable that is an array of my struct. Lets just call it [CODE] //Stuff is the name of the …
hey guys, I've just joined this group and i have problem which i believe you can help!!!! I want to know how to make a c program read from an application program like Microsoft excel and them writes the results with its printf().
i'm trying run a cgi script from a c program using execve(). It seems to be able to open and run the cgi file. but instead of actually generating graphical html it generates html code. example: execve("this.cgi", NULL, NULL) will generate: [CODE] /this.cgi /this.cgi <html> . . . the rest …
Is this possible to write a variable argument macro like this: [CODE]#include <stdio.h> #include <stdarg.h> #define func(x, ...)\ {\ va_list ap;\ va_start(ap, x);\ int y = va_arg(ap, int);\ printf("y is %d\n",y);\ }\ int main() { int x; func(5, 4); return 0; }[/CODE] I found an interview question which asked how …
Error message: "error C2181:1> illegal else without matching if 2>fatal error C1075: end of file found before the left brace '{' at 'c:\documents and settings\tjeo1\my documents\visual studio 2008\projects\new\newc\exercise.cpp(3)' was matched [CODE]#include <stdio.h> int main (void) { int c; printf("letter="); c = getchar ( ); if (('0' <= c && c …
Hi I had a quick question about the libraries in C. Is there anything available like the java api library (java.sun.com) but for C? The closest thing I can think of is the MSDN Library but I'm not sure. A comprehensive guide that describes what the various libraries do would …
Hi have done the whole program but now am stuck at what initially seemed like a simple thing a repitation loop the program is supposed to ask the user if he/ she wants to continue with adding more data - if no exit and continue with the other stuff. [CODE]char …
The books i have already read :- 1. C ANSII Edition ( Cant understand their language ) 2. C tutor 3. Pointers and memory ( Stanford )
Hey, just curious. Is atof() a C++ only function or will it work in standard C?
1. Why Nesting of comments is not supported by c. code does not involve much complexity to have that. 2. Why Array partial initialization have zero appended. why it cannot do in normal declaration. 3. continued.... Thanks, 3R
He guys, I am trying to figure out what is wrong with this code for level traversal in binary tree in C. I would really appreciate any help or suggestion or changes in my code. [CODE] status level_traverse( tree T, status( *p_func_f ) () ) { tree *node ; queue …
I am new in C programming and I would like help to make the following program: A program that reads a file (file name you can get from command line arguments or ask from the user) and produces output that counts the 10 most frequent words in the file and …
Hey guys .i want to display a number on the 7 segment display through C program .. Can anybody pls give me source code or recommend respective book. Urgent Thank u
C video tutorials for beginners [I]<<snip>>[/I]
I have some code that works. However, when I try to make it not work (i.e. try to execute a non-existent program), I don't see any indication that it hasn't worked. Here's the code snippet. [code=C] pid_t pid; // char *const paramList[] = {"/usr/threshold/bin/preconfig.sh", options[indexSelected].optionName, NULL}; const char* paramList[] = …
Hi I am working on this game. I really never played it so I just read about it. I am getting three errors. I was hoping you guys can help me fix it? Thank you Error 1 error C2059: syntax error : 'do' 2008\projects\program9\program9\craps.cpp 36 Program9 Error 2 error C2143: …
Hello everyone! I'm a beginner in C programming, and am writing code that is supposed to read in all the data from a formatted file, parse it into useful values, and then manipulate these values. However, I'm stuck on the the parsing part. I'm relying heavily on pointers, which I'm …
During a university project, I had to print some int arrays to the screen, and I wanted to do it with printf. So I decided to include a function that converts an integer array into a string type, and passes the string out to the calling function. But the function …
This isn't entirely a programming problem, but it may be at its base, which is why I'm bringing it to you guys. For my assignment, I have download a .txt file from my prof's webpage, and then have my program open it. The file, when opened in a web browser, …
can anyone explain how can a function return a double pointer with which a 2 dimensional array can be traversed, this function takes the number of rows and columns as arguments: like: void ** function(int row, int col) { void **returningPointer= NULL; void*p; for (i = 0; i < row; …
problem was first posted [URL="http://www.daniweb.com/forums/post1174806.html"]here[/URL]. lionaneesh got a problem with this question. I tried to solve that question myself. He solved himself, but i failed. the questions is: This program/function will delete all those characters in the first string i.e str1[] that matches any character in the second string i.e …
[CODE]#include<stdio.h> void squeez(char s[],char z[]); int main() { char s[100] = "Hey wassup !!!!!!"; char z[100] = "Wow cool!!!!!"; squeez(s,z); return(0); } void squeez(char s[] , char z[]) { int j,dummy = 0,i=0; char x[100]; for(j = 0 ; s[j] != '\0';j++)/* the starting loop */ { while(z[i] != '\0') …
Error at line 56 and 68. Unable to resolve it. [code=c] #include<stdlib.h> #include<stdio.h> #include<ctype.h> #include<string.h> #include"stack.h" #include"queue.h" #include"calcstack.h" #define MAXSIZE 80 void intopost(stack *stackPtr, queue *queuePtr, char expression[]); void pushvalue(queue *queuePtr, char item); void pushop(stack *stackPtr,queue *queuePtr,char item); void noBracket(stack *stackPtr,queue *queuePtr,char item); void removeBracket(stack *stackPtr,queue *queuePtr,char item); int precendence(char …
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