sum using for loop in c
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
int main(int argc, char *argv[]) {
int x,i,n,num, f = 1;
double k=3,e=2.71828;
printf("Enter a number to calculate its factorial: ");
scanf("%d", &x);
for (x = 1; x <= n; x++){
f = f *x;
}
printf("enter number to calculate its probability: ");
scanf("%d",&num);
if (num=x,num<=10){
for (i=1;i<=num;i++){
double p=((pow(k,x))*(pow(e,-k)))/f;
printf("The probability is %f\n",p);}
}
else {
printf("this number is not between 1 to 10");
}