I'm writing a function that should generate random sudoku puzzles for a simulation project; this funcion takes as argoument the number of cells to generate then it generates the indexes of cells and numbers to put in those cells. I have a problem in generation of cells indexes, I'm not an expert in programming and i can't find a good ro...
i am confused with the precedence and order of evaluation.pls explain me with an example ...
I'm reading a file in C, char by char but I need to get 2 consecutive chars. Please, can someone suggest me some options? the main idea of the program is to read a source C file and to find the number of all significant chars (ignore ws) and to ignore '*/' & '/*'. I'm trying to write the program in really basic level because it is for c...
Hi, We have lot of products and there are some common DLLs across each product's application. Right now we copy each common DLL into each product's bin directory and treat them as private assembly. This unnecessarily increase the msi size of each product and when a problem occurs in a DLL we have to build each product's msi comprising t...
I am unable to print the euro symbol. The program I am using is below. I have set the character set to codepage 1250 which has 0x80 standing for the euro symbol. Program ======= #include <stdio.h> #include <locale.h> int main() { printf("Current locale is: %s\n", setlocale (LC_ALL, ".1250")); printf("Euro character: %c\n", 0x...
I am running gprof on my executable, but the executable spends a lot of time wait()ing for child processes to complete. Is the time spent waiting factored in to the gprof timings? ...
Some example code to start the question: #define FOO_COUNT 5 static const char *foo[] = { "123", "456", "789", "987", "654" }; The way this would normally be iterated over, as for one example, is the following: int i = FOO_COUNT; while (--i >= 0) { printf("%s\n", foo[i]); Is there anyway to d...
This is in reference to a solution posted on: http://stackoverflow.com/questions/1969588/looping-a-fixed-size-array-without-defining-its-size-in-c Here's my sample code: #include <stdio.h> #include <stdlib.h> int main(int argc, char *argv[]) { static const char *foo[] = { "this is a test", "hello world", ...
[Updated organization and content for clarity] The Real Question What would be a good way, for C, to help a programmer, while s/he's typing, write safe and correct calls to project-specific printf-like debugging functions? C macros? C wrapper functions? Code editor macros or templates? Other? Background Questions and Answers Much so...
Season's greetings! I have a function that prints out the contents of a char** that is being used as an array to store a number of strings. The is declared like this: char** commandArray = (char**)malloc(historySize); where historySize is a global int set to 8, for now. The array is populated with commands that the user enters, in s...
How do you switch pointers in a function? void ChangePointers(int *p_intP1, int *p_intP2); int main() { int i = 100, j = 500; int *intP1, *intP2; /* pointers */ intP1 = &i; intP2 = &j; printf("%d\n", *intP1); /* prints 100 (i) */ printf("%d\n", *intP2); /* prints 500 (j) */ ChangePointers(intP1, intP2); printf("%d\n", *intP1); /* ...
for certain functions i want to create a copy of the string within the function and then manipulate this - for some strange reason, i cant get strcpy to work (gives me a segmentation fault) - i've also tried passing the arg as a string, this doesnt work either (g++ throws an error saying it expect a char*) #include <iostream> #include ...
hi i have the following c code int *a; size_t size = 2000*sizeof(int); a = (int *) malloc(size); which works fine... but now if i have the following char **b = malloc(2000*sizeof *b); where every element of b has different length... now, how is it possible to do the same thing for b as i did for a, i.e. is the below c...
hi i have the following code... int *a, *b; int *d; int N = 2000; size_t size = N*sizeof(int); a = (int *) malloc(size); b = (int *) malloc(size); ... cudaMalloc((void **) &d, size); it works just fine... now assume i have the following char **t = malloc(2000* sizeof *t); for(...) { ... t[i] = (char *)mal...
I have been doing a little recreational holiday computing. My mini-project was a simulation of the Italian game of "tomboli". A key building block was a simulation of the following process; The game is controlled by a man with a bag of 90 marbles, numbered 1 to 90. He draws marbles one by one randomly from the bag, each time calling out...
I can do this in c++/g++: struct vec3 { union { struct { float x, y, z; }; float xyz[3]; }; }; Then, vec3 v; assert(&v.xyz[0] == &v.x); assert(&v.xyz[1] == &v.y); assert(&v.xyz[2] == &v.z); will work. How does one do this in c with gcc? I have typedef struct { union { st...
In a response elsewhere, I found the following snippet: In general it is nicer in C to have the caller allocate memory, not the callee - hence why strcpy is a "nicer" function, in my opinion, than strdup. I can see how this is a valid pattern, but why might it be considered nicer? Are there advantages to following this patter...
I got some huge files I need to parse, and people have been recommending mmap because this should avoid having to allocate the entire file in-memory. But looking at 'top' it does look like I'm opening the entire file into the memory, so I think I must be doing something wrong. 'top shows >2.1 gig' This is a code snippet that shows what...
Hello, I am looking for an extremely small way of turning a string like "123" into an integer like 123 and vice-versa. I will be working in a freestanding environment. This is NOT a premature optimization. I am creating code that must fit in 512 bytes, so every byte does actually count. I will take both x86 assembly(16 bit) and C code t...
Hello, linux gcc 4.4.1 C99 I am just wondering is there any advantage using the following techniques. I noticed with some code I was reading the exit number went up in value, as displayed in this code snippet. /* This would happen in 1 function */ if(test condition 1) { /* something went wrong */ exit(1); } if(test condition...