I cannot find any good info on how to setup multi line macros. The problem I am having is that I need to use only macros (no functions) to compute factorials. When I use functions the code works but when I try to use macros I keep getting parse errors(it points to the macro I am using as the problem).

I left the function in there so people can understand what I am trying to achieve. If anyone has any advice or can point me to some resources that discuss how to set up multi line macros I would really appreciate it. Thank you in advance.Code:#include<stdio.h> #include<math.h> #define fact(x) do { \ int factorial=1; \ int k=1; \ factorial=factorial*k; \ k++; \ } while (k<=n) #define comb(answer)(result/(input*last)) //int fact(int n); main() { int n,k,x,result,diff,input,answer,last; printf("Please enter a value for n \n"); scanf("%i",&n); printf("Please enter a value for k \n"); scanf("%i",&k); if (n<k) printf("N must be larger than or equal to K \n"); else { result=fact(n); input=fact(k); diff=n-k; last=fact(diff); printf("The combination of %i things taken %i at a time is %i \n",n,k,comb(answer)); } return 0; } //int fact(int n) //{ // int k; // int factorial=1; // for(k=1; k<=n; k++) // { // factorial=factorial * k; // } //return factorial; //}