Hello, I need your to code the following logic. I am not expert in programming side but I'm pretty sure its just a matter of some bitwise operations, I'm just not entirely sure of exactly what I should be doing. Input of Block is 64 bits, For example A=64 Output of block should be x =16 y=16 z=16 s=16 How can this logic can be implemented in C++. Please share the logic.
Here a example in cpp, i think it is very easy to change it to c. First "lintunion.h" Code: #ifndef LONGINTUNION_H_INCLUDED #define LONGINTUNION_H_INCLUDED //#include <iostream> //#include <iomanip> #include <stdio.h> #include <stdlib.h> // EXIT_SUCCESS union einheit { unsigned long ulwert; unsigned char mwertbytes[8]; unsigned short mwertushort[4]; }; void buzubin(unsigned int letter, char wort[]); void zeigeWerte(union einheit ehe); void dectoshort( unsigned short zahl, char zudi[], short vornullen); #endif // LONGINTUNION_H_INCLUDED now lintinion.c Code: #include "lintunion.h" /* ----------------------------------------------------------------------- * buzubin converts a decimal value(only 0 to 255) given by argument 1 * in to a binary value shown as string. This string is stored in argument 2. * The sting shows all eight bit of the value in argument 1. * the other bytes is for to terminate the string * syntax: buzubin( char-value_as_int, Binaer_value_as_string); */ void buzubin(unsigned int letter, char wort[]) { unsigned int slei, dum, testwert; if ((letter > 0) || (letter <= 255)) { /* Ininitalisert die 8 Binärstellen mit Null */ for (slei = 0; slei <= 11; slei++) wort[8] = '\0'; for (slei = 0; slei <= 7; slei++) { testwert = 128 >> slei; /* Bit7(128dez) ist auf Char-Nr.0 */ dum = letter & testwert; if (dum != 0) wort[slei] = '1'; else wort[slei] = '0'; wort[slei + 1] = '\0'; } } } // shows all values void zeigeWerte(union einheit ehe) { int i; char binwort[15] = {0}; char longwort[100] = {0}; //show values of unsigned char printf ("unsigned long value: %lu binary\n", ehe.ulwert); //std::cout << "unsigned long value: " << ehe.ulwert << " binary: "; for (i = 7; i >= 0; i--) { buzubin(ehe.mwertbytes[i], binwort); printf("%s", binwort); //std::cout << binwort << " "; } //std::cout <<std::endl; printf ("\n"); //std::cout <<"Now as unsigned char: " << std::endl; printf ("Now as unsigned char: \n"); for (i = 7; i >= 0; i--) { buzubin(ehe.mwertbytes[i], binwort); printf("mwertshort[ %2d] = %4u binary: %s\n", i, (int)ehe.mwertbytes[i], binwort); //std::cout << "mwertbytes[" << i << "] = " << std::setw(3) << (int)ehe.mwertbytes[i] << " binary: " << binwort << std::endl; } //Werte von unsigned char zeigen //std::cout << std::endl << "Now as unsigned short: " << std::endl; printf("\nNow as unsigned short: "); for (i = 3; i >= 0; i--) { dectoshort( (unsigned long)ehe.mwertushort[i], longwort, 1); printf("mwertshort[ %d] = %6u binary: %s\n", i, (int)ehe.mwertushort[i], longwort); //std::cout << "mwertshort[" << i << "] = " << std::setw(6) << (int)ehe.mwertushort[i] << " binary: " << longwort <<std::endl; } //std::cout << "---------------------------------------------------------" << std::endl; printf("---------------------------------------------------------\n"); } /** converts arg 1(unsigned short decimal) * in a char-string (argument2), if argument 3(with leading zeros) 0 * the leading Zerows will not shown in the string, else * with leading zeros */ void dectoshort( unsigned short zahl, char zudi[], short vornullen) { char wort[35] = {0}; char worz[35] = {0}; int slei, sleib; unsigned short dum2, testwert, kon = 1; kon <<= 15; for (slei = 0; slei <= 15; slei++) { testwert = kon >> slei; /* Bit30(1073741824dez) is char number 0 */ dum2 = zahl & testwert; if (dum2) wort[slei] = '1'; else wort[slei] = '0'; } // begin to set ende of leading zeros for (slei = 0; slei <= 15; slei++) if (wort[slei] == '1') break; // wort is with leading zeros, worz without for (sleib = 0; sleib <= 32; sleib++) { worz[sleib] = wort[slei]; if (wort[slei] == '\0') break; slei++; } // take result in to argument 2 for (slei = 0; slei <= 15; slei++) if ( vornullen == 0) zudi[slei] = worz[slei]; // if arg 3(vornullen) = 0 string with no leading zeros else zudi[slei] = wort[slei]; // if arg 3 = 1 then with leading zeros } here main.c Code: #include "lintunion.h" int main() { union einheit flint; printf("test\n"); //std::cout << "Test" << std::endl; printf("length of long int......: %lu byte\n", sizeof(long int)); //std::cout << "length of long int: " << sizeof(long int) << " byte" << std::endl; printf("length of unsigned short: %lu byte\n", sizeof(short)); //std::cout << "length of short...: " << sizeof(short) << " byte" << std::endl << std::endl; flint.ulwert = 1234567890; #include "lintunion.h" int main() { union einheit flint; printf("test\n"); //std::cout << "Test" << std::endl; printf("length of long int......: %lu byte\n", sizeof(long int)); //std::cout << "length of long int: " << sizeof(long int) << " byte" << std::endl; printf("length of unsigned short: %lu byte\n", sizeof(short)); //std::cout << "length of short...: " << sizeof(short) << " byte" << std::endl << std::endl; flint.ulwert = 1234567890; //Werte von unsigned char zeigen zeigeWerte(flint); flint.ulwert = 0; printf("\nNow all variables are deleted:\n"); //std::cout << std::endl <<"Now all variables are deleted:" << std::endl; //Werte von unsigned char zeigen zeigeWerte(flint); flint.mwertushort[0] = 59861; flint.mwertushort[1] = 17142; flint.mwertushort[2] = 9861; flint.mwertushort[3] = 7142; printf("here the short-variables:\n"); //std::cout << std::endl << "Jetzt Zuweisung von Werten an short-Variable:" << std::endl; //Werte von unsigned char zeigen zeigeWerte(flint); return EXIT_SUCCESS; } //shows values of unsigned char zeigeWerte(flint); flint.ulwert = 0; printf("\nNow all variables are deleted:\n"); //std::cout << std::endl <<"Now all variables are set so zero:" << std::endl; //Werte von unsigned char zeigen zeigeWerte(flint); flint.mwertushort[0] = 59861; flint.mwertushort[1] = 17142; flint.mwertushort[2] = 9861; flint.mwertushort[3] = 7142; printf("here the short-variables:\n"); //std::cout << std::endl << "now the short-variables" << std::endl; //Werte von unsigned char zeigen zeigeWerte(flint); return EXIT_SUCCESS; } It was coded with codelite on SUSE LINUX tumbleweed with gcc. Should run on other systens too. I got no errors or warnings if i took // instead of /**/ for coments. So you can change the code better from c to c++. Sorry To make the choice easier with #ifdef i was (first)to lazy: Her to change easier from c to cpp_ at first again lintunion.h: Code: #ifndef LONGINTUNION_H_INCLUDED #define LONGINTUNION_H_INCLUDED /** to change from c to cpp: //#define IS_C 1 #define IS_CPP 2 */ /** Version for c */ #define IS_C 1 //#define IS_CPP 2 #ifdef IS_CPP #include <iostream> #include <iomanip> #endif #ifdef IS_C #include <stdio.h> #include <stdlib.h> // EXIT_SUCCESS #endif union einheit { unsigned long ulwert; unsigned char mwertbytes[8]; unsigned short mwertushort[4]; }; void buzubin(unsigned int letter, char wort[]); void zeigeWerte(union einheit ehe); void dectoshort( unsigned short zahl, char zudi[], short vornullen); #endif // LONGINTUNION_H_INCLUDED for change to cpp you must take an other name for lintunion.c; lintunion.cpp Code: #include "lintunion.h" /* ----------------------------------------------------------------------- * buzubin converts a decimal value(only 0 to 255) given by argument 1 * in to a binary value shown as string. This string is stored in argument 2. * The sting shows all eight bit of the value in argument 1. * the other bytes is for to terminate the string * syntaxc: buzubin( char-value_as_int, Binaer_value_as_string); */ void buzubin(unsigned int letter, char wort[]) { unsigned int slei, dum, testwert; if ((letter > 0) || (letter <= 255)) { /* Ininitalisert die 8 Binärstellen mit Null */ for (slei = 0; slei <= 11; slei++) wort[8] = '\0'; for (slei = 0; slei <= 7; slei++) { testwert = 128 >> slei; /* Bit7(128dez) ist auf Char-Nr.0 */ dum = letter & testwert; if (dum != 0) wort[slei] = '1'; else wort[slei] = '0'; wort[slei + 1] = '\0'; } } } // shows all values void zeigeWerte(union einheit ehe) { int i; char binwort[15] = {0}; char longwort[100] = {0}; //show values of unsigned char #ifdef IS_C printf ("unsigned long value: %lu binary\n", ehe.ulwert); #endif #ifdef IS_CPP std::cout << "unsigned long value: " << ehe.ulwert << " binary: "; #endif for (i = 7; i >= 0; i--) { buzubin(ehe.mwertbytes[i], binwort); #ifdef IS_C printf("%s", binwort); #endif #ifdef IS_CPP std::cout << binwort << " "; #endif } #ifdef IS_CPP std::cout <<std::endl << "Now as unsigned char: " << std::endl; #endif #ifdef IS_C printf ("\nNow as unsigned char: \n"); #endif for (i = 7; i >= 0; i--) { buzubin(ehe.mwertbytes[i], binwort); #ifdef IS_C printf("mwertshort[ %2d] = %4u binary: %s\n", i, (int)ehe.mwertbytes[i], binwort); #endif #ifdef IS_CPP std::cout << "mwertbytes[" << i << "] = " << std::setw(3) << (int)ehe.mwertbytes[i] << " binary: " << binwort << std::endl; #endif } //Werte von unsigned char zeigen #ifdef IS_CPP std::cout << std::endl << "Now as unsigned short: " << std::endl; #endif printf("\nNow as unsigned short: "); for (i = 3; i >= 0; i--) { dectoshort( (unsigned long)ehe.mwertushort[i], longwort, 1); #ifdef IS_C printf("mwertshort[ %d] = %6u binary: %s\n", i, (int)ehe.mwertushort[i], longwort); #endif #ifdef IS_CPP std::cout << "mwertshort[" << i << "] = " << std::setw(6) << (int)ehe.mwertushort[i] << " binary: " << longwort <<std::endl; #endif } #ifdef IS_CPP std::cout << "---------------------------------------------------------" << std::endl; #endif #ifdef IS_C printf("---------------------------------------------------------\n"); #endif } /** converts arg 1(unsigned short decimal) * in a char-string (argument2), if argument 3(with leading zeros) 0 * the leading Zerows will not shown in the string, else * with leading zeros */ void dectoshort( unsigned short zahl, char zudi[], short vornullen) { char wort[35] = {0}; char worz[35] = {0}; int slei, sleib; unsigned short dum2, testwert, kon = 1; kon <<= 15; for (slei = 0; slei <= 15; slei++) { testwert = kon >> slei; /* Bit30(1073741824dez) is char number 0 */ dum2 = zahl & testwert; if (dum2) wort[slei] = '1'; else wort[slei] = '0'; } // begin to set ende of leading zeros for (slei = 0; slei <= 15; slei++) if (wort[slei] == '1') break; // wort is with leading zeros, worz without for (sleib = 0; sleib <= 32; sleib++) { worz[sleib] = wort[slei]; if (wort[slei] == '\0') break; slei++; } // take result in to argument 2 for (slei = 0; slei <= 15; slei++) if ( vornullen == 0) zudi[slei] = worz[slei]; // if arg 3(vornullen) = 0 string with no leading zeros else zudi[slei] = wort[slei]; // if arg 3 = 1 then with leading zeros } the same for main.c, take main.cpp Code: #include "lintunion.h" int main() { union einheit flint; #ifdef IS_C printf("test\n"); printf("length of long int......: %lu byte\n", sizeof(long int)); printf("length of unsigned short: %lu byte\n", sizeof(short)); #endif #ifdef IS_CPP std::cout << "Test" << std::endl; std::cout << "length of long int: " << sizeof(long int) << " byte" << std::endl; std::cout << "length of short...: " << sizeof(short) << " byte" << std::endl << std::endl; #endif flint.ulwert = 1234567890; //Werte von unsigned char zeigen zeigeWerte(flint); flint.ulwert = 0; #ifdef IS_C printf("\nNow all variables are deleted:\n"); #endif #ifdef IS_CPP std::cout << std::endl <<"Now all variables are deleted:" << std::endl; #endif //Werte von unsigned char zeigen zeigeWerte(flint); flint.mwertushort[0] = 59861; flint.mwertushort[1] = 17142; flint.mwertushort[2] = 9861; flint.mwertushort[3] = 7142; #ifdef IS_C printf("here the short-variables:\n"); #endif #ifdef IS_CPP std::cout << std::endl << "Jetzt Zuweisung von Werten an short-Variable:" << std::endl; #endif //Werte von unsigned char zeigen zeigeWerte(flint); return EXIT_SUCCESS; } Hope, this example is not to dificult, and it is useful.
