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# Number Conversion in C Language

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Here we written code to Convert Decimal to Binary or Hexa decimal by user choice.

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Task: Write a C program to Convert Hexa decimal value to Binary and vice versa.

## Write a C Program to convert decimal to binary and hex (using switch call function the function)

#include <stdio.h>
void dectobin(long int);
void dectohex(long int);
void main()
{
int c;
long num;
printf(“Enter a decimal integer: “);
scanf(“%ld”, &num);
printf(“1. Decimal TO Binary\n2. Decimal to HexaDecimal\n”);
printf(“Choose conversion type : “);
scanf(“%d”,&c);
printf(“Input number is : %ld”,num);
switch (c)
{
case 1:
dectobin(num);
break;
case 2:
dectohex(num);
break;
default:
printf(“\nWronge choice\n”);
}
}
void dectobin(long int dec_num)
{
int i=0,remainder;
char bi;
while (dec_num > 0)
{
remainder = dec_num % 2;
bi[i++]=remainder+’0′;
dec_num = dec_num / 2;
}
printf(“Its binary equivalent is : “);
for(–i;i>=0;i–)
printf(“%c”,bi[i]);
}
void dectohex(long int dec_num)
{
int i=0,remainder;
char he;
while(dec_num>0)
{
remainder = dec_num % 16;//To convert integer into character
if( remainder < 10)
remainder =remainder + 48;
else
remainder = remainder + 55;
he[i++]= remainder;
dec_num = dec_num / 16;
}
printf(“\nIts hexa equivalent is : “);
for(–i;i>=0;i–)
printf(“%c”,he[i]);
}

Output:
Enter a decimal integer: 16
1. Decimal TO Binary