Decimal to Hex Converter

hey , im trying to create a dec to hex converter and the same formula works for all other bases but for hex i cant get it to display the letters 'a' - 'f' , if i use "%c" , i cant get the numbers to work!..please help.

Code:

int convertHex(int num)
{
	quotient=(num / 16);
	remainder=(num % 16);

		if (remainder <= 9 && quotient >= 1)
		{
			b[j++]=remainder;
			count++;
			convertHex(quotient);
		}
		
		else if(remainder > 9 && quotient >= 1)
		{
			b[j++]=(((remainder-10)+'A'));
			count++;
			convertHex(quotient);
		}
		else if(quotient <= 0)
		{	
			(remainder <= 9 ) ? (b[j++]=remainder) : (b[j++]=(((remainder-10)+'A')));
			count++;
		
		//reverse(a,count);
		for (j = 0; j < count; ++j)
		{
			printf("%d",b[j]);
		}

		printf("\n");
		
		b[bits];
		count = 0;
		for (j = 0; j < count; ++j)
		{
			b[j] = 0;
		}
		return b[0];
	}
}

int *reverse(int *swap,int b)
{
    int a = 0;
    int temp;
    
    for(a ; a < --b ; a++) 
    {
        temp=swap[a];       
        swap[a]=swap[b];    
        swap[b]=temp;       
    }
    return swap;    
}

ive got a function which uses just printf instead of arrays however i cant reverse the digits in that ,

Code:

int convertHex(int num)
{
	quotient=(num / 16);
	remainder=(num % 16);

		if (remainder <= 9 && quotient >= 1)
		{
			printf("%d",remainder);
			convertHex(quotient);
		}
		
		else if(remainder > 9 && quotient >= 1)
		{
			printf("%c",((remainder-10)+'A'));
			convertHex(quotient);
		}
		else if(quotient <= 0)
		{	
			(remainder <= 9 ) ? printf("%d",remainder): printf("%c",((remainder-10)+'A'));
			printf("\n");
			return 0;
		}
}

either one is fine , just as long as it works!..thanks !!

Because int x=0x7a really is the same number as int y=122, the only meaningful "hex conversion" that can take place with C integers involves realizing them as a string for some purpose.

Code:

#include <stdio.h>

int main() {
	int x=0x7a, y=122, hex, dec;
	printf( "Convert hex to dec: %d\n",x);
	printf( "Convert dec to hex: %x\nNow input a decimal number:",y);
	scanf("%d",&dec);
	printf("convert to hex: %x\nInput a hexadecimal number:",dec);
	scanf("%x",&hex);
	printf("convert to dec: %d\n",hex);
}

I hope this simplifies things for you.