C Program to Program to convert a decimal number to Binary, octal or hexadecimal

#include<stdio.h>

void func(int num,int b);

int main(void)

{

	int num,ch;

	printf("Enter a decimal number : ");

	scanf("%d",&num);

	printf("1.Binary\n2.Octal\n3.Hexadecimal\n");

	printf("Enter your choice : ");

	scanf("%d",&ch);

	switch(ch)

	{

		case 1:

			printf("Binary equivalent is : ");

			func(num,2);

			break;

		case 2:

			printf("Octal equivalent is : ");

			func(num,8);

			break;

		case 3:

			printf("Hexadecimal equivalent is : ");

			func(num,16);

			break;

	}

	printf("\n");

	return 0;

}

void func(int num,int b)

{

	int i=0,j,rem;

	char arr[20];

	while(num>0)

	{

		rem=num%b;

		num/=b;

		if(rem>9 && rem<16)

			arr[i++]=rem-10+'A';

		else

			arr[i++]=rem+'0';

	}

	for(j=i-1; j>=0; j--)

		printf("%c",arr[j]);

}