Define a macro to set nth bit to zero in c

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August undefined, 2024

WebMar 3, 2024 · For this purpose, I've created some macros to help manipulate the bitset array, based on this comp.lang.c faq item ( bflags.h ): #pragma once #include #include /* * Macros to simplify creating and using bit flags. * * Flags are stored in an array of uint32_t, the size of which * is determined by the required number of bits. WebNov 28, 2024 · Then, to check if any of the bits within that range are set, and you value with the mask and check if non-zero result: #define hasSomeBits (val, p1, p2) ( ( (val) & maskFromTo ( (p1), (p2))) != 0) Of course, the usual caveats apply when using macros as functions (such as parenthesising all your arguments and ensuring side-effects don't …

Program to clear K-th bit of a number N - GeeksforGeeks

WebAug 15, 2024 · Problem Solution: In this program, we will print the line number in the source code using __LINE__ macro on the console screen. Here, we will use three macros, __LINE__, __FUNCTION__, and __FILE__. __LINE__ Macro: __LINE__ macro is a preprocessor in C language and it is used to get the current line number of the source … WebSetting an N-th bit means that if the N-th bit is 0, then set it to 1 and if it is 1 then leave it unchanged. In C, bitwise OR operator ( ) used to set a bit of integral data type. As we … st john\u0027s lutheran church adelaide hills

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WebNov 20, 2024 · Any bit Set bit = Set bit which means, 0 1 = 1 1 1 = 1 So for setting a bit, performing a bitwise OR of the number with a set bit is the best idea. N … WebMacros. A macrois a fragment of code which has been given a name. Whenever the name is used, it is replaced by the contents of the macro. There are two kinds of macros. … WebMar 3, 2024 · Avoid bit-shifting 1 since it is of type int and can give the same problems as mentioned above. Use 1u instead. Don't declare functions in C as static char* bflags_or … st john\u0027s lutheran church adrian michigan

c - When was the NULL macro not 0? - Stack Overflow

C program to print the line number in source code with filename and ...

WebJan 25, 2024 · IF you want to index a bit you could: bit = (char & 0xF0) >> 7; gets the msb of a char. You could even leave out the right shift and do a test on 0. bit = char & 0xF0; if the bit is set the result will be > 0; obviousuly, you need to change the mask to get different bits (NB: the 0xF is the bit mask if it is unclear). WebThe __LINE__ Macro Example in C. Print the current function name by using __func__ in C. The #line directive Example in C. Define Macros for YES and NO constants using #define in C. Define a function like Macro that should use printf in C. Define Macro PRINT to print given integer argument in C. st john\u0027s lutheran church adrian miWebAug 25, 2024 · The #line directive Example in C; Define Macros for YES and NO constants using #define in C; Define a function like Macro that should use printf in C; Define Macro PRINT to print given integer argument in C; Define Macros to SET and CLEAR bit of a PIN in C; Define Macro to toggle a bit of a PIN in C; Define a Macro to set Nth bit to Zero … st john\u0027s lutheran church aitkin mn

"WebNov 28, 2024 · #include uint32_t maskFrom (const int p) { // Silently treat invalid input as zero. if ( (p 32)) return 0; // Create lookup table first time through. static int firstTime = 1; … " - Define a macro to set nth bit to zero in c

Define a macro to set nth bit to zero in c

How do I set, clear, and toggle a single bit? - Stack Overflow

WebsetBit is a macro which sets the bit and clrBit clears the bit. The code was ported from C a long time ago. – user195488 Jul 8, 2010 at 11:07 Add a comment 9 Answers Sorted by: … WebOct 1, 2016 · In C source code the NULL macro would still be either an integer constant expression that evaluates to 0 or a (void *) cast of the same. The resulting pointer value might have a representation that isn't 0 but that doesn't mean the source code can assume it will be 0xffff or anything like that. – Windows programmer.

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WebMay 26, 2010 · I need a macro that allows me to set a field (defined by its bit-mask) of a register (defined by its address) to a given value. Here's what I came up with: #include #include typedef unsigned int u32; /* * Set a given field defined by a bit-mask MASK of a 32-bit register at address * ADDR to a value VALUE. WebMay 27, 2024 · We first create a mask that has set bit only at given position using bit wise shift. mask = 1 << position Then to change value of bit to b, we first make it 0 using below operation value & ~mask After changing it 0, we change it to b by doing or of above expression with following (b << p) & mask, i.e., we return ( (n & ~mask) (b << p)) Below ...

WebSep 9, 2016 · To set the bit, we do a bitwise or of the dword that contains the bit and the value of 1 shifted left by bit_index_in_dword: that bit is set, and other bits do not change. To clear the bit, we do a bitwise and of … WebJan 24, 2016 · Step by step descriptive logic to get nth bit of a number. Input number from user. Store it in some variable say num. Input the bit position from user. Store it in some …

WebOct 12, 2014 · #include void main (void) { unsigned int byte; unsigned int bit_position; unsigned int tempbyte = 0x01; //get the values of the byte and the bit positions //set bit … WebApr 8, 2016 · In practice, this came up because I can't decide between these two C code snippets: /* Bits are one-indexed - even in C, this feels more natural */ #define …

WebJan 8, 2012 · Assuming you have a working mask for n bits, e.g. // set the first n bits to 1, rest to 0 #define BITMASK1(n) ((1ULL << (n)) - 1ULL) you can make a range bitmask by shifting again: // set bits [k+1, n] to 1, rest to 0 #define BITNASK(n, k) ((BITMASK(n) >> k) << k) The type of the result is unsigned long long int in any case.

WebAug 25, 2024 · The #line directive Example in C; Define Macros for YES and NO constants using #define in C; Define a function like Macro that should use printf in C; Define Macro PRINT to print given integer argument in C; Define Macros to SET and CLEAR bit of a PIN in C; Define Macro to toggle a bit of a PIN in C; Define a Macro to set Nth bit to Zero … st john\u0027s lutheran church 81 christopher stWebSep 7, 2024 · Each bit of the DDR represents a specific output pin. A logic high might indicate output mode while a logic low would indicate input mode. Assuming DDR is an 8 … st john\u0027s lutheran church aberdeen sdWebNov 8, 2024 · Given a number N, the task is to clear the K-th bit of this number N. If K-th bit is 1, then clear it to 0 and if it is 0 then leave it unchanged. Input: N = 5, K = 1 Output: 4 5 is represented as 101 in binary and has its first bit 1, so clearing it will result in 100 i.e. 4. Input: N = 5, K = 2 Output: 5 5 is represented as 101 in binary and ... st john\u0027s lutheran church allentown paWebSetting bit using macro: We use the bitwise OR operator ( ) to set a bit. x = (1U<< pos); it will set nth bit . //Macro to set nth-bit /* Set single bit at pos to '1' by generating a … st john\u0027s lutheran church abbottstown paWebLet's say i have an uint8_t 00100100 (36) and i want to check if the 3th bit is set. Here is the code how im doing it now, for only one bit. ... one way is to make a function so you can call it for any nth bit you want to check: ... this would be the wrong way. it would be better to implement it as a macro so that the compiler can actually do ... st john\u0027s lutheran church ambridge paWebAug 30, 2024 · Explanation: Initially val is 0x11, its binary value is "0001 0001". In the example, we are setting and clear bit 2 (please note start counting bits from 0 i.e. first bit … st john\u0027s lutheran church altamont nyWebSep 23, 2014 · I would like to set the i-th bit to zero no matter what the i-th bit is. unsigned char pt = 0b01100001; pt [0] = 0; // its not how we do this... Setting it to one, we can use … st john\u0027s lutheran church american falls id