ic, basic binary to hex using nibbles

2026-06-17 00:35:30 +02:00
parent 6e1a33db8a
commit 450579d266
2 changed files with 64 additions and 0 deletions
@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <string.h>
+
+/*
+  take input
+  decide if hex or binary
+  then convert
+  then print
+
+  let's convert binary to hex first
+  for each byte, split into nibble,
+
+*/
+
+
+//might have to add some padding, but basic works
+void bintohex(char* string_in){
+  const char hexmap[] = "0123456789ABCDEF";
+  char hexnum[4];
+  int stringl = strnlen(string_in, 10)-1;
+  //aantal nibbles
+  int loopamount = stringl/4;
+  printf("totalstringlength=%d\n", stringl);
+  for (int loopcount = 0; loopcount < loopamount; loopcount++) {
+	int bin2dec = 0;
+	//rechts naar links in nibble
+	for (int nibbledigit = 0 ; nibbledigit <4 ; nibbledigit++) {
+	  //nibblecount + current
+	  int targetdigit = loopcount*4+(4-1-nibbledigit);
+	  //check if j+i = 1
+	  //printf("nibbledigit:%d=%c=%i\n", j, string_in[targetdigit],1<<j);
+	  bin2dec += 1 * (string_in[targetdigit]-'0')*1<<(nibbledigit);
+	}
+	hexnum[loopcount]=hexmap[bin2dec];
+	printf("nibble:%i=%d\n",loopcount,bin2dec);
+  }
+  printf("hex=%s", hexnum);
+}
+
+int main(){
+  printf("input either binary or hexadecimal\n");
+  char buff[32+2]; //4bytes+\n+null
+  fgets(buff, sizeof(buff), stdin);
+  bintohex(buff);
+}
+
+