I’m looking at the RNG from K&R2 2.7 Type Conversions: unsigned long int next = 1; /* rand: return pseudo-random integer on 0..32767 */ int rand(void) { next = next * 1103515245 + 12345; return (unsigned int)(next / 65536) % 32768; } /* srand: set seed for rand() */ void srand(unsigned int seed) { next… Read More Why divide a variable before type conversion?
If I have an enum type declaration in a recursive function, will it be ‘created’ multiple times? Does it work like ‘#define’ in the sense that it just tells the pre-processor to ‘swap’ values (but with scope in mind)? What would happen here, per example: void recuFun() { enum someEnum {UP, DOWN, LEFT, RIGHT}; //… Read More How does enums types initializations in recursive functions work?
What this program does is to receive as input an integer number that will be the amount of monsters that will be created, after that it will receive as input the information of the n monsters and then it will receive another input that will be a "search" that will look for the monsters that… Read More C struct Data search
I have following typedef struct: typedef struct { E_Menus Menu; // E_Menus is a typedef enum char *MenuStr[200]; int CurrentItem; int ItemAmount; int ItemGap; int StartItemGap; } T_Menu; I want to initialize a struct of type T_Menu as a module variable (not local inside a function) as following: char mBootMenuStr[] = {"some text"}; T_Menu mBootMenu… Read More Struct initialization with char array outside a function
#include <stdio.h> int main() { char *a,*b; scanf("%s %s",a,b); printf("%s %s",a,b); return 0; } It works like this, #include <stdio.h> int main(){ char *a; scanf("%s",a); printf("%s",a); return 0; } I think its something with memory becoz when i use malloc and assign some memory it works. >Solution : It is undefined behaviour (UB) in both… Read More Can't understand why its not working when using two variables, the same works if i use just a single variable
I want to read lines from a text file and store the information in three variables. For example, if the line from a file is A Tale of Two Cities Charles Dickens 1859 I want to store this into two char arrays and one int variable. So, I want to extract the following information from… Read More reading a line into three variables
I have been reading the termios man page, and I’m confused by CSIZE. Its obscure explanation is: CSIZE: Character size mask. Values are CS5, CS6, CS7, or CS8. Later, in the rawmode example, they first NOT CSIZE: termios_p->c_cflag &= ~(CSIZE | PARENB); And then they OR one of its settings: termios_p->c_cflag |= CS8; I don’t… Read More Explain how setting termios CSIZE works?
I have declared following struct typedef struct STRUCT{ char calculation[30]; }STRUCT; I have a function: int add_number(int num1, STRUCT *pointer) { int integer; int sum; printf("\nGive an integer to be added: "); scanf("%d", &integer); sum = num1 + integer; printf("%d+%d=%d\n", num1, integer, sum); scanf("%s", pointer->calculation); // here I would want to get the %d+%d=%d stored… Read More Getting calculation into struct field type of char
I’m told the following C code #define ADD(a, b) a + b // example function void foo() { int i = ADD(1, 2); // add two ints double d = //doubles ADD(3.4, 5.6); int sly = ADD(1, 2) * 3; // not what it appears to be } converts to this Java code package demo;… Read More Converting C to Java understanding macro's in C
For example: int a, float b; But it’s wrong. Actually, I want to use it in the for loop. Just like this: for (int a, float b; a < 1; a++) { } I can use for loops to simplify mutex like this #define in_mutex_env(val) for(int __x = ({mutex_lock(); 0}); __x < 1; __x++, mutex_unlock())… Read More How to declare multiple different type variables in one line in C language