
C Program To Find Sum Of Series 
#include
#include
long int factorial(int n);
void main()
{
int n,i;
float s,r;
char c;
clrscr();
repeat : printf("\nYou have this series: 1/1! + 2/2! + 3/3! + 4/4! ...");
printf("\nTo which term you want its sum? ");
scanf("%d",&n);
s=0;
for (i=1;i<=n;i++)
{ s=s+((float)i/(float)factorial(i)); }
printf("\nThe sum of %d terms is %f",n,s);
fflush(stdin);
printf ("\nDo you want to continue?(y/n): ");
scanf("%c",&c);
if (c=='y')
goto repeat;
getch();
}
long int factorial(int n)
{
if (n<=1)
return(1);
else
n=n*factorial(n1);
return(n);
}
Sample Output :
You have this series: 1/1! + 2/2! + 3/3! + 4/4! ...
To which term you want its sum? 15
The sum of 15 terms is 2.709237
Do you want to continue?(y/n): n


