Example Programs

Program to Find the Sum of Fibonacci Series in C

# include <stdio.h>
# include <conio.h>
void main()
{
            int a = -1, b = 1, c = 0, i, n, sum = 0 ;
clrscr() ;
printf("Enter the limit : ") ;
scanf("%d", &n) ;
            printf("\nThe fibonacci series is : \n\n") ;
for(i = 1 ; i <= n ; i++)
{
                        c = a + b ;
                        printf("%d \t", c) ;
sum = sum + c ;
                        a = b ;
b = c ;
}
printf("\n\nThe sum of the fibonacci series is : %d", sum) ;
getch() ;
}

Output of above program

Enter the limit : 5
The fibonacci series is : 0 1 1 2 3
The sum of the fibonacci series is : 7

Program to Find the Factorial Series in C

#include <stdio.h>
int main()
{
int c, n, fact = 1;
            printf("Enter a number to calculate it's factorial\n");
scanf("%d", &n);
for (c = 1; c <= n; c++)
{
                                    fact = fact * c;
}
printf("Factorial of %d = %d\n", n, fact);
return 0;
}

Output of above program

Enter a number to calculate it's factorial
6
Factorial of 6 = 720

Program to Find the Factorial Series Using Recursion in C

 #include<stdio.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));
            }
}

Program to check if given number is Prime or not in C

#include<stdio.h> 
#include<conio.h> 
void main() 
{ 
int n,i,m=0,flag=0; 
clrscr();
printf("Enter the number to check prime:"); 
scanf("%d",&n); 
m=n/2;
for(i=2;i<=m;i++) 
{ 
if(n%i==0) 
{ 
printf("Number is not prime"); 
flag=1; 
break;
} 
} 
if(flag==0)
printf("Number is prime"); 
getch(); 

}
Output of above program

Result 1

Enter the number to check prime:56
Number is not prime

Result 2

Enter the number to check prime:23
Number is prime

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