How to use input from first operation as variable in second operation

[abrown07]

How do I get the program to take the "Population" calculated from the first time and use it as the "initial" variable for the next calculation. And for it to continue to do this for generations 2 on each time taking the previously calculated Population and using it as the variable "initial" for the next calculation. With what I have right now when I run the program it just kind of... pauses after I give all the inputs.

#include<stdio.h>
#include<math.h>
 
int main(void)
 
{
 
  double Population,capacity,initial;
  int generations;
  float result,growth;
 
 
   printf("Please give the carrying capacity of the environment: ");
   scanf("%lf", &capacity);
 
   printf("Please give the intrisic growth rate: ");
   scanf("%f", &growth);
 
   result=exp (growth);
 
 
   printf("Please give the inital population of the species: ");
   scanf("%lf", &initial);
 
   printf("Please indicate the number of generations: ");
   scanf("%d", &generations);
 
   Population=initial*result*(1-(initial/capacity));
 
    for(generations = 2; generations <=80; initial= Population)
 
       Population=initial*result*(1-(initial/capacity));
 
   printf("The expected population at the next generation is: %.6f\n",Population);
   return(0);
 
}  
 

[whodgson]

Convert population into a function
//then
population+=population();
BTW you should place you code in between code tags to make it easier for others to read.

[jkmyoung]

The problem was that in your for loop you had:
Population=initial*result*(1-(initial/capacity));
You're using the initial variable over and over. You wanted:
Population=Population*result*(1-(initial/capacity)); or
Population*=result*(1-(initial/capacity));