RWTH-BuS-2026/c-01-bits
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aufgabe 2 und kommentaare

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f0tt3r 2026-06-08 22:22:47 +02:00
parent 614fa462d8
commit c723b55d05
2 changed files with 12 additions and 2 deletions
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BIN
hallo
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14
hallo-welt.c
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@ -1,4 +1,5 @@
#include "hallo-welt.h" #include "hallo-welt.h"
#include <stdbool.h>
#include <stdint.h> #include <stdint.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
@ -9,14 +10,22 @@
void hallo_welt(void) { printf(HALLO); } void hallo_welt(void) { printf(HALLO); }
int zweierkomplement(int32_t i) { return ~i + 1; }
// use more then one int type // use more then one int type
const char *binaerzahl(uint32_t bin) { const char *binaerzahl(int32_t bin) {
char *str = malloc(sizeof(bin) * 8 + char *str = malloc(sizeof(bin) * 8 +
1); // Allocate 8 bits for actual data and 1 Bit for the \0 1); // Allocate 8 bits for actual data and 1 Bit for the \0
// sign indicating the end of the string // sign indicating the end of the string
bool is_negative;
if (!str) if (!str)
return NULL; return NULL;
uint8_t bb; if (bin < 0) {
bin = zweierkomplement(bin);
is_negative = true;
}
int32_t bb; // that way we keep the memory lighter
printf(is_negative ? "-" : "");
for (int i = sizeof(bin) * 8 - 1; i >= 0; i--) { for (int i = sizeof(bin) * 8 - 1; i >= 0; i--) {
bb = bin >> i; bb = bin >> i;
str[i] = (bb % 2 == 1) ? 1 : 0; str[i] = (bb % 2 == 1) ? 1 : 0;
@ -28,6 +37,7 @@ const char *binaerzahl(uint32_t bin) {
int getint(void) { int getint(void) {
uint32_t i; uint32_t i;
printf("Geben Sie eine Dezimahlzahl ein: ");
scanf("%u", &i); scanf("%u", &i);
return i; return i;
} }