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#include <stdio.h>
 
void UIntToHexStr (unsigned int uiValue, char pcStr[]){
 
  unsigned char ucCharCounter;
 
  pcStr[0]='0';
  pcStr[1]='x';
 
  for(ucCharCounter=5; ucCharCounter!=1; ucCharCounter--){
    if((uiValue & 0x000F) < 10){
      pcStr[ucCharCounter]=(uiValue & 0x000F)+'0';
    }
    else{
      pcStr[ucCharCounter]=(uiValue & 0x000F) - 10 + 'A';
    }
    uiValue=uiValue>>4;
  }
 
  pcStr[6]=NULL;
 
}
 
 
 
enum Result {OK,ERROR};
enum Result eHexStringToUInt(char pcStr[],unsigned int *puiValue){
 
  unsigned char ucCharCounter;
 
  if(pcStr[0]!='0' || pcStr[1]!='x' || pcStr[0]!=NULL){
    return ERROR;
  }
 
 
  for(ucCharCounter=2; pcStr[ucCharCounter]!=NULL; ucCharCounter++){
 
 
    if(ucCharCounter>5){
      return ERROR;
    }    
 
    if(pcStr[ucCharCounter]>='A') {
      *puiValue=(*puiValue<<4) + (pcStr[ucCharCounter] - 'A' + 10);
    }
 
    else{
      *puiValue=(*puiValue<<4) + (pcStr[ucCharCounter] - '0');
    }
 
 
  }
  return OK;
}
 
 
 
 
void AppendUIntToString(unsigned int uiValue, char pcDestinationStr[]){
 
  unsigned char ucCharCounter;
 
  for(ucCharCounter=0; pcDestinationStr[ucCharCounter]!=NULL; ucCharCounter++){}
  UIntToHexStr(uiValue, pcDestinationStr+ucCharCounter);
}
 
int main(){
	unsigned int uiValue = 100;
	unsigned char pcStr[20]="";
	uIntToHexStr(uiValue, pcStr);
	int i;
	for(i=0;i<6;i++){
	printf("%c", pcStr[i]);}
 
	unsigned int elo;
	unsigned int *wsknaelo;
	wsknaelo = &elo;
	eHexStringToUInt(pcStr,&wsknaelo);
 
	printf("\ntu jest zamienona liczba %d", wsknaelo);
	return 0;
}

prog.c: In function 'UIntToHexStr':
prog.c:20:11: warning: assignment makes integer from pointer without a cast
   pcStr[6]=NULL;
           ^
prog.c: In function 'eHexStringToUInt':
prog.c:31:48: warning: comparison between pointer and integer
   if(pcStr[0]!='0' || pcStr[1]!='x' || pcStr[0]!=NULL){
                                                ^
prog.c:36:44: warning: comparison between pointer and integer
   for(ucCharCounter=2; pcStr[ucCharCounter]!=NULL; ucCharCounter++){
                                            ^
prog.c: In function 'AppendUIntToString':
prog.c:63:55: warning: comparison between pointer and integer
   for(ucCharCounter=0; pcDestinationStr[ucCharCounter]!=NULL; ucCharCounter++){}
                                                       ^
prog.c: In function 'main':
prog.c:70:2: warning: implicit declaration of function 'uIntToHexStr' [-Wimplicit-function-declaration]
  uIntToHexStr(uiValue, pcStr);
  ^
prog.c:78:19: warning: pointer targets in passing argument 1 of 'eHexStringToUInt' differ in signedness [-Wpointer-sign]
  eHexStringToUInt(pcStr,&wsknaelo);
                   ^
prog.c:27:13: note: expected 'char *' but argument is of type 'unsigned char *'
 enum Result eHexStringToUInt(char pcStr[],unsigned int *puiValue){
             ^
prog.c:78:25: warning: passing argument 2 of 'eHexStringToUInt' from incompatible pointer type
  eHexStringToUInt(pcStr,&wsknaelo);
                         ^
prog.c:27:13: note: expected 'unsigned int *' but argument is of type 'unsigned int **'
 enum Result eHexStringToUInt(char pcStr[],unsigned int *puiValue){
             ^
prog.c:80:2: warning: format '%d' expects argument of type 'int', but argument 2 has type 'unsigned int *' [-Wformat=]
  printf("\ntu jest zamienona liczba %d", wsknaelo);
  ^
/home/Mw2NqS/ccIGZ72G.o: In function `main':
prog.c:(.text.startup+0x40): undefined reference to `uIntToHexStr'
collect2: error: ld returned 1 exit status

Standard output is empty