C Programming Code Examples C > Mathematics Code Examples Factorial series-e^x Factorial series-e^x #include <stdio.h> #include <conio.h> #include<math.h> long int factorial(int n); void main() { int x,i; float s,r; char c; clrscr(); printf("You have this series:-1+x/1! + x^2/2! + x^3/3! + x^4/4! ..x^x/x!"); printf(" To which term you want its sum? "); scanf("%d",&x); s=0; for (i=1;i<=x;i++) { s=s+((float)pow(x,i)/(float)factorial(i)); } printf("The sum of %d terms is %f",x,1+s); fflush(stdin); getch(); } long int factorial(int n) { if (n<=1) return(1); else n=n*factorial(n-1); return(n); }
