Write a C Program to Count Number of Digits in an Integer.

/*

Write a C Program to Count Number of Digits in an Integer.

*/

#include <stdio.h>

int main()

{

            long long num;

             int count = 0;

            /* Input number from user */

            printf("Enter any number: ");

            scanf("%lld", &num);

            /* Run loop till num is greater than 0 */

            while(num != 0)

            {

                         /* Increment digit count */

                        count++;

                        /* Remove last digit of 'num' */

                         num /= 10;

            }

            printf("Total digits: %d", count);

            return 0;

}

OUTPUT :

Enter any number: 45698

Total digits: 5

---

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Write a C Program to find the factorial of a number.

Question :  Write a C Program to find the factorial of a number.

/*

Write a C Program to find the factorial of a number.

*/

#include <stdio.h>

int main()

{

            int n, i;

            unsigned long long fact = 1;

            printf("Enter an integer: ");

            scanf("%d", &n);

            // shows error if the user enters a negative integer

            if (n < 0)

            {

                        printf("Error! Factorial of a negative number doesn't exist.");

            }

            else

{

                        for (i = 1; i <= n; ++i)

{

                         fact *= i;

                        }

             printf("Factorial of %d = %llu", n, fact);

            }

    return 0;

}

OUTPUT :

Enter an integer: 10

Factorial of 10 = 3628800

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Question : Write a C Program to check whether a number is positive or negative.

Question :  Write a C Program to check whether a number is positive or negative.

/*

Write a C Program to check whether a number is positive or negative.

*/

#include <stdio.h>

int main()

{

            double num;

            printf("Enter a number: ");

            scanf("%lf", &num);

            if (num <= 0.0)

{

                        if (num == 0.0)

                        {

                                    printf("You entered 0.");

                        }

else

{

printf("You entered a negative number.");

}

            }

else

{

            printf("You entered a positive number.");

            }

    return 0;

}

OUTPUT :

Enter a number: 12.3

You entered a positive number.

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Question : Write a C Program to check whether a year is leap year or not.

 Question :  Write a C Program to check whether a year is leap year or not.

/*

Write a C Program to check whether a year is leap year or not.

*/

#include <stdio.h>

int main()

{

            int year;

            printf("Enter a year: ");

            scanf("%d", &year);

            if (year % 4 == 0)

{

                        if (year % 100 == 0)

{

                                    // the year is a leap year if it is divisible by 400.

                                                if (year % 400 == 0)

                                    {

                                     printf("%d is a leap year.", year);

                                    }

                                     else

{          

                                    printf("%d is not a leap year.", year);

                                    }

                         }

else

{

                                    printf("%d is a leap year.", year);

}

            }

else

{

            printf("%d is not a leap year.", year);

            }

    return 0;

}

OUTPUT :

Enter a year: 1900

1900 is not a leap year.

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Question : Write a C Program to find minimum element in array.

Question :  Write a C Program to find minimum element in array.

/*

Write a C Program to find minimum element in array.

*/

#include <stdio.h>

int main()

{

            int array[100], minimum, size, c, location = 1;

            printf("Enter number of elements in array\n");

            scanf("%d", &size);

            printf("Enter %d integers\n", size);

for (c = 0; c < size; c++)

            scanf("%d", &array[c]);

            minimum = array[0];

            for (c = 1; c < size; c++)

                        {

                                    if (array[c] < minimum)

                                                {

                                                 minimum = array[c];

                                                location = c+1;

                                                }

                         }

  

printf("Minimum element is present at location %d and its value is %d.\n", location, minimum);

    return 0;

}

OUTPUT :

Enter number of elements in array

5

Enter 5 integers

2

5

4

1

6

Minimum element is present at location 4 and its value is 1.

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Question : Write a C Program to find ASCII value of a character entered by user.

Question :  Write a C Program to find ASCII value of a character entered by user.

#include <stdio.h>

int main()

{ 

            char c;

            printf("Enter a character: ");

            scanf("%c", &c); 

            // %d displays the integer value of a character

            // %c displays the actual character

            printf("ASCII value of %c = %d", c, c);

            return 0;

}

OUTPUT :

Enter a character: G

ASCII value of G = 71

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Question : Write a C Program for Fibonacci series.

Question :   Write a C Program for Fibonacci series.

#include <stdio.h>

int main()   

{   

int n1=0,n2=1,n3,i,number;   

            printf("Enter the number of elements:");   

scanf("%d",&number);   

            printf("\n%d %d",n1,n2);//printing 0 and 1   

            for(i=2;i<number;++i)//loop starts from 2 because 0 and 1 are already printed    

            {   

                        n3=n1+n2;   

                        printf(" %d",n3);   

                         n1=n2;   

                         n2=n3;   

 } 

  return 0; 

 }

  

OUTPUT :

Enter the number of elements:15

0 1 1 2 3 5 8 13 21 34 55 89 144 233 377

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