Question

Develop in C language the function whose prototype is described below. Please, send the entire code, including any variable defined before the function, for example.

/ **
@brief Read bit of memory position pointed to by p
@param p Pointer to 32bit variable whose bit will be read
@param bitn Bit position (0 to 31) to be read
@return returns the state (0 or 1) of the memory location bit pointed to by p
* /
unsigned char ReadBit (unsigned long * p, unsigned char bitn) {}

Answer 1

We know the Bit Numbering starts from 0, So to check if the first bit is set for number 2 i.e 0010 ..Its 1st bit is set, so we should get 1. Here is the Test code as well.

unsigned char ReadBit (unsigned long * p, unsigned char bitn) {

return ((*p) >> bitn) & 1;

}

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Full Code

#include <stdio.h>

unsigned char ReadBit (unsigned long * p, unsigned char bitn) {

return ((*p) >> bitn) & 1;

}

int main() {

unsigned long p = 2;

unsigned long *r = &p;

char bitn = 1;

printf("%d\n", ReadBit(r,bitn));

}


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SEE OUTPUT


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