Problem With Code

Hello I'am trying to write a program that allows the user to buy and sell products in a port then go to another port and buy and sell products. But there is a problem in the pruchase function. I can'nt figure out what the problem is so I would appriciate any help anyone can give me.

Code:

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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>

#define A 100
#define SIZE 9

typedef struct{
  char Goods[20];
}Goods_g;

typedef struct{
  char PortName[10];
}Ports_p;

int DisplayPort(Goods_g *G, Ports_p *P, float variables[]);

int Purchase(Goods_g *G, float variables[], float money);

int main()
{ 
  Goods_g G[9]= {
                { "Fish" },
            { "Cotton" },
            { " Wood" },
            { "Coco" },
            { "Sugar" },
            { "Guns" },
            { "Textiles" },
            { "Tobacco" },
            { "Wine" },
                };

  Ports_p P[6] = {
    { "Sydney" },
    { "London" },
    { "LosAngles" },
    { "NewYork" },
    { "Paris" },
    { "Tokyo" },
  };
  char name[A];
  int i;
  int j;
  int k;
  float variables[SIZE];
 float money = 1000;
  printf("Please enter your name: ");
  scanf("%s",name);

  printf("Please select which port you want to start in: ");
  scanf("%d",&i);

  srand((unsigned)time(NULL));
  for (j=0; j<SIZE; j++)
    variables[j] = (rand()%26)/14.0f;

  if ( i >= 1 && i <= 6 ) {
    DisplayPort ( &G[k-1], &P[i-1], variables);
  }
 
        if ( k >=1 && k<= 9) {
Purchase(&G[k-1], variables, money);

  return 0;
}

int DisplayPort(Goods_g *G, Ports_p *P, float variables[])
{
  G->Fish  = 50*variables[0];
  G->Cotton = 80*variables[1];
    G->Wood = 100*variables[2];
  G->Coco = 140*variables[3];
  G->Sugar = 350*variables[4];
  G->Guns = 700*variables[5];
  G->Textiles =1350*variables[6];
  G->Tobacco =1900*variables[7];
  G->Wine =2150*variables[8];

  printf("Welcome to %s\n",P->PortName);
  printf("The prices for the material is as follows\n");
  printf("Fish=%f\n", G->Fish);
  printf("Cotton=%f\n", G->Cotton);
  printf("Wood=%f\n", G->Wood);
  printf("Coco=%f\n", G->Coco);
  printf("Sugar=%f\n", G->Sugar);
  printf("Textiles=%f\n", G->Textiles);
  printf("Tobacco=%f\n", G->Tobacco);
  printf("Wine=%f\n", G->Wine);

  return 0;
}

int Purchase(Goods_g *G, float variables[], float money)
{
  G[0]->Goods_g  = 50*variables[0];
  G[1]->Goods_g = 80*variables[1];
  G[2]->Goods_g = 100*variables[2];
  G[3]->Goods_g = 140*variables[3];
  G[4]->Goods_g = 350*variables[4];
  G[5]->Goods_g = 700*variables[5];
  G[6]->Goods_g =1350*variables[6];
  G[7]->Goods_g =1900*variables[7];
  G[8]->Goods_g =2150*variables[8];
 
        int amount;
        float totals;
        float totalm;

printf("How many individual units of %s do you want to buy: ", G->Goods);
scanf("%d", &amount);



            totals = (int) G->Goods*amount;
            totalm = money-totals;
            printf("You have %f money left\n", totalm);
            printf("You have %d unit(s) of %s\n",amount, G->Goods);

return 0;
        }

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Code:

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Dear Salem if you are reading this I want to you to know that I did think about how each function should work and what it should do but it's just that I rather get things done 1 at a time rather then doing everything together. Plus thank you for all your help so far.

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What is the "problem"? Does it compile? Does it crash when you enter "hippo" instead of "123"? Does it crash all the time? Have you tried debugging it?

Part of your problem may be the fact that k is uninitialized in main(). Turn on compiler warnings!