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Some Programs in C

 

1. Write a program to check whether the given number is prime or not

Prime Number – Prime numbers are those numbers which has no positive divisor other than 1 and itself.

Example

#include<stdio.h>

int main()

{

int i,n,p=0;

printf("enter the number");

scanf("%d",&n);

for(i=2;i<n;i++)

{

if(n%i==0)

{

p=1;

break;

}

}

if(p==0)

{

printf("Number is prime");

}

else

{

printf("Number is not prime");

}

return 0;

}

Output

enter the number 17

Number is prime

 

2. Write a program to calculate the Factorial.

Factorial –  It is the product of all positive integers less than or equal to n. It is denoted by n!.

Example

#include<stdio.h>

int main()

{

int i,n,f=1;

printf("enter the number");

scanf("%d",&n);

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

{

f=f*i;

}

printf("Factorial of number is=%d",f);

}

Output

enter the number 5

Factorial of number is=120

 

3. Write a program to check whether the given number is palindrome or not.

Palindrome Number – Palindrome numbers are those numbers which reads the same backward or forward.

Example

#include<stdio.h>

int main()

{

int r,n,p=0,temp;

printf("enter the number");

scanf("%d",&n);

temp=n;

while(n!=0)

{

r=n%10;

p=p*10+r;

n=n/10;

}

if(p==temp)

{

printf("Number is palindrome");

}

else

{

printf("Number is not palindrome");

}

return 0;

}

Output

enter the number 111

number is palindrome

 

4. Write a program to check whether the number is Armstrong or not.

Armstrong Number – Armstrong number is an integer such that the sum of the cubes of its digits is equal to the number itself.

Example

#include<stdio.h>

int main()

{

int n,r,p=0,temp;

printf("enter the number ");

scanf("%d",&n);

temp=n;

while(n>0)

{

r=n%10;

p=p+(r*r*r);

n=n/10;

}

if(temp==p)

{

printf("Number is Armstrong");

}

else

{

printf("Number is not Armstrong");

}

return 0;

}

Output

enter the number 153

Number is Armstrong

 

5. Write a program to display the Fibonacci Series.

Fibonacci Series – A series in which next number is occurred by adding two previous numbers.

Example

#include<stdio.h>

int main()

{

int i=0,j=1,k,p,n;

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

scanf("%d",&n);

printf("\n%d %d",i,j);

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

{

k=i+j;

printf(" %d",k);

i=j;

j=k;

}

return 0;

}

Output

Enter the number of elements:12

0 1 1 2 3 5 8 13 21 34 55 89

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