Reversing a String using C

#include <stdio.h>

int main ()
{
    char name[20];
    printf("enter your name \n");
    scanf("%[^\n]s",name);
     printf("%s\n",strrev(name));
    return 0;
}

C Program to Convert a Number Decimal System to Binary System using Recursion

/*
 * C Program to Convert a Number Decimal System to Binary System using Recursion
 */
#include <stdio.h>
int convert(int);
int main()
{  int dec, bin;
    printf("Enter a decimal number: ");
    scanf("%d", &dec);
    bin = convert(dec);
    printf("The binary equivalent of %d is %d.\n", dec, bin);
    return 0;
}

int convert(int dec)
{
    if (dec == 0)
    {
        return 0;
    }
    else
    {
        return (dec % 2 + 10 * convert(dec / 2));
    }
}

output:-

Enter a decimal number: 10
The binary equivalent of 10 is 1010

Decimal to Binary conversion using C

/*
 * C Program to Print Binary Equivalent of an Integer using Recursion
 */
#include <stdio.h>

int binary_conversion(int);

int main()
{
   int num, bin;

   printf("Enter a decimal number: ");
   scanf("%d", &num);
   bin = binary_conversion(num);
   printf("The binary equivalent of %d is %d\n", num, bin);
}

int binary_conversion(int num)
{
    if (num == 0)
    {
        return 0;
    }
    else
    {
        return (num % 2) + 10 * binary_conversion(num / 2);
    }
}