Practice Programs

  • Doing Programs gives you the great understanding about what you have learned.
  • Doing Programs gives you the Confidence.
  • So let's Start by doing some programming.
  • Q:Define function 'Reverse_number' which will take integer number as an argument and it should perform operation of reversing the number and return that reverse number.

    Solution:
    #include<stdio.h>

int Reverse_number(int n) //declaration.

int Reverse_number(int n)//definition.
{
    int i,j=0;
    while(n!=0)
    {
        i = n%10;
        j = (j*10) + i;
        n = n/10;
    }
    return j;
}

    Using above function:
     void main()
{
int result;
  //calling function 'Reverse_number'.
result = Reverse_number(564);//formal parameters
printf("\nReverse number is %d",result);
}

    Output:
    Reverse number is 465.

    Exercise:
    Define function 'is_palindrome' which will take integer number as an argument and it should perform operation of checking whether number is palindrome or not,And return 1 if palindrome otherwise return 0.

  • Q:Define function 'is_prime' which will take integer number as an argument and it should perform operation of checking that number is prime or not , return 1 if prime otherwise return 0.

    Solution:
    int is_prime(int n)
{
    int i,flag;
    for(i=2 ;i<n ; i++)
    {
        if(n%i == 0)
        {
            break;
        }
    }
    if(i == n)
      flag = 1;
    else
      flag = 0;

 return flag;
}

    Using above function:
    void main()
{
int result;
  //calling function 'is_prime'.
result = is_prime(1);
if(result == 1)
   printf("\nNumber is a prime number.");

else
  printf("Number is not an prime number.");

}

    Output:
    Number is not an prime number.

    Exercise:
    Define function 'is_even' which will take integer number as an argument and it should perform operation of checking whether number is even or odd,And return 1 if even otherwise return 0.

  • Q:Define function 'sort_asc' which will take integer array and number of element in an array as an argument and it should perform operation of sorting the array in ascending order.

    Solution:
    #include<stdio.h>

void sort_Asc(int arr[],int n) ;//decleration

void sort_Asc(int arr[],int n) //definition
{
    int i,j,temp;
    for(i=0;i<n;i++)
    {
        for(j=i+1; j<n; j++)
        {
            if(arr[i] > arr[j])
            {
                temp = arr[i];
                arr[i] = arr[j];
                arr[j] = temp;
            }
        }
    }
}

    Using above function:
    void main()
{ int i;
int a[10] = {10,9,8,7,6,5,4,3,2,1};


printf("\nUnsorted array is :\n");
for(i=0;i<10;i++)
{
    printf("%d\t",a[i]);
}
//calling function 'sort_Asc'
sort_Asc(a,10);

printf("\nArray in ascending array is :\n");
for(i=0;i<10;i++)
{
    printf("%d\t",a[i]);
}
}

    Output:
    Unsorted array is :
    10    9    8    7    6    5    4    3    2    1
    Array in ascending array is :
    1    2    3    4    5    6    7    8    9    10

    Exercise:Define function 'sort_desc' which will take integer array and number of element in an array as an argument and it should perform operation of sorting the array in descending order.

  • Q:Define function 'dict_ord' which will take character array as an argument and it should perform operation of sorting the array in dictionary order.

    Solution:
    void dict_ord(char s[])
{
    int i,j;
    char ch;
    for(i=0; s[i]!='\0'; i++)
    {
        for(j=i+1; s[j]!='\0'; j++)
        {
            if(s[i] > s[j])
            {
                ch = s[i];
                s[i] = s[j];
                s[j] = ch;
            }
        }
    }
}

    Using above function:
    void main()
{ int i;
char a[10] = "zaheer";


printf("\nUnsorted letters :\n");
for(i=0;a[i]!='\0';i++)
{
    printf("%c\t",a[i]);
}
//calling function 'dict_ord'
 dict_ord(a);

printf("\nletters in Dictionary order are:\n");
for(i=0;a[i]!='\0';i++)
{
    printf("%c\t",a[i]);
}

}

    Output:
    Unsorted letters :
    z    a    h    e    e    r
    letters in Dictionary order are:
    a    e    e    h    r

    Exercise: Define function 'non_dict_ord' which will take character array as an argument and it should perform operation of sorting the array in non-dictionary order.

  • Q:Define function 'power' which will take two integer number 'a' and 'b'as an argument and it should perform operation of calculating 'a' raised to power of b by 'Recursion'and return the result.

    Solution:
    #include<stdio.h>

int power(int a ,int n);//decleration

int power(int a ,int n) //definition
{
    if(n == 1)
      return a;
    else
      return (a*(power(a,n-1)));

}

    Using above function:
    void main()
{
    int result;
//calling function 'power'
 result = power(2,5);

 printf("\n2 raised to 5 is %d",result);


}

    Output:
    2 raised to 5 is 32.

    Exercise:
    Define function 'product' which will take integer number 'a' as an argument and it should perform operation of calculating product of n numbers by 'Recursion' and return the result.






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