Thread: Factorial with decimals

I'm trying to write a factorial for these numbers 1.1+2.2+3.3+4.4+5.5 to infinity.

I thought I'd try with one number and then using recursion to go to infinity.
However I seem to be having a problem trying to get it. It just flashes whenever i run the program. I'm using codeblocks

Code:

    
double i;
double num = 1.2;
double j=1;

for (i=1; i<num; i+.1){
   j=j*i;
}

printf("The factorial of %lf is %lf\n",num,j);

Should I use a while loop instead?