Program to calculate sum of this special series using for loop in C.

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/*Program to calculate sum of series

 1/(1*2)+1/(2*3)+1/(3*4)+.......+1/((n-1)*n)

 where n is the value entered by user.

 =>Explicit type conversion
 =>Nested loop
*/

#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
int i,n;
float sum,mul;
clrscr();
sum=0;


printf("\nEnter limit number : ");
scanf("%d",&n);


printf("\nSeries=");

printf("\n---------------------\n");

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

mul=i*(i+1);
printf(" +1/(%d*%d) ",i,i+1);


sum=sum+(float)1/mul;  //Explicit type conversion
}

printf("\n---------------------\n");

printf("\nSum of series= %.3f",sum);

getch();
}

Program to print factorial of any input number using for loop in C.

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/*Program to print factorial of any input number*/

#include<stdio.h>
#include<conio.h>
void main()
{
int num,i;

float fact;

/* If we take fact as integer, it can not be able
to store factorial of value greater than 9 */

fact=1.0;

clrscr();

printf("\nEnter any number:");
scanf("%d",&num);

clrscr();  //for clear screen

printf("\n-------------------------------");
printf("\nNumber entered is: %d",num);
printf("\n-------------------------------");
printf("\nFactorial of %d is:",num);
printf("\n-----------------------------\n");


if(num==0)
{
printf("\n1"); //factorial of 0 is 1
}
else
{
for(i=1;i<=num;i++)
{
fact=fact*num;
num--;
}
}
printf("\n%.0f",fact);

printf("\n------------------------------");

getch();
}