Sample C Program To Find Factorial Of A Number.

#include <stdio.h>
#include <conio.h>

void main()
{

    int n, i, fact=1;
    clrscr();
    printf(" Enter any no: ");
    scanf("%d", & n);

    for( i = n; i > = 1; i-- )
    {
        fact = fact  *  i;
    }
    printf(" Factorial =%d",fact);
    getch();

}

OUTPUT:

Enter any no: 5
Factorial = 120


C Program To Find Factorial Of A Number Using Function:

#include <stdio.h>
#include <conio.h>

long factorial(int);

int main()
{
    int number;
    long fact = 1;

    printf("Factorial Of No.");
    scanf("%d", &number);

    printf("%d! = %ld\n", number, factorial(number));

    return 0;
}

long factorial(int n)
{
    int c;
    long result = 1;

    for (c = 1; c <= n; c++)
        result = result * c;

    return result;
}

OUTPUT:

Factorial Of No. 5 = 120




C Program To Find Factorial Of A Number Using Recursion.

#include <stdio.h>
#include <conio.h>

long factorial(int);

int main()
{
    int n;
    long f;

    printf("Enter an integer to find factorial\n");
    scanf("%d", &n);

    if (n < 0)
        printf("Negative integers are not allowed.\n");
    else
    {
        f = factorial(n);
        printf("%d! = %ld\n", n, f);
    }

    return 0;
}

long factorial(int n)
{
    if (n == 0)
        return 1;
    else
        return(n * factorial(n-1));
}

OUTPUT:

Enter an integer to find factorial 5 = 120




C Program To Generate Fibonacci Series Up To N Number Of Terms

#include <stdio.h>
#include <conio.h>

int main()
{
    int i, n, t1 = 0, t2 = 1, nextTerm = 0;

    printf("Enter the number of terms: ");
    scanf("%d", &n);

    printf("Fibonacci Series: ");

    for (i = 1; i <= n; ++i)
    {
        // Prints the first two terms.
        if(i == 1)
        {
            printf("%d, ", t1);
            continue;
        }
        if(i == 2)
        {
            printf("%d, ", t2);
            continue;
        }
        nextTerm = t1 + t2;
        t1 = t2;
        t2 = nextTerm;
        printf("%d, ", nextTerm);
    }
    return 0;
}


OUTPUT:

Enter the number of terms: 8
Fibonacci Series: 0, 1, 1, 2, 3, 5, 8, 13

C Program To Print Fibonacci Series Upto 100.

#include <stdio.h>
#include <conio.h>

void main()
{

    int a = 1, b = 1, c = 0, i;
    clrscr();
    printf(" %d\t %d\t ", a, b);

    for( i = 0; i < = 10; i++)
    {
        c = a + b;
        if(c < 100)
        {
            printf("%d\t",c);
        }

        a = b;
        b = c;
    }
    getch();

}

 OUTPUT:

 1 1 2 3 5 8 13 21 34 55 89


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