Can someone please look at this

[voodoo3182]

Why will this code not print the %f values?

#include<stdio.h>
#include<conio.h>

struct database{
       char prod[30];
       float amount[5];
       float cal[5];
       float prot[5];
       float carb[5];
       float fat[5];
       };
       
       struct database main_m[200];
       struct database side[200];
       struct database sweet[200];
       
       int i;
       
       
       int main()
       
       {
           
           for (i = 0; i < 4; i++)
           {
               printf("\nEnter product name for main %d:", i);
               scanf("%s", main_m[i].prod);
               
               printf("\nEnter amount of product in grams for %d:", i);
               scanf("%f", main_m[i].amount);
               
               printf("Enter calorie amount for %d:", i);
               scanf("%f", main_m[i].cal);
               
               printf("Enter protien value in grams for %d", i);
               scanf("%f", main_m[i].prot);
               
               printf("Enter Carbohydrate value in grams for %d:", i);
               scanf("%f", main_m[i].carb);
               
               printf("Enter fat content in grams for %d:", i);
               scanf("%f", main_m[i].fat);
               }
               
               FILE *fp = fopen("output.dat", "wb");
               fwrite(main_m, 1, sizeof(struct database) * 200, fp);
               
               FILE *fpp = fopen("output.dat", "rb");
               fread (main_m, 1, sizeof(struct database) * 200, fpp); 

               for (i = 1; i < 5; i++) {
                printf("%s\n", main_m[i].prod);
                printf("%f\n", main_m[i].amount);
                printf("%f\n", main_m[i].cal);
                printf("%f\n", main_m[i].prot);
                printf("%f\n", main_m[i].carb);
                printf("%f\n", main_m[i].fat);
                getch();
                
                }
    
                 
                 }

[Dave_Sinkula]

Spot some of the many differences:

#include<stdio.h>
#include<conio.h>

struct database
{
   char prod[30];
   float amount[5];
   float cal[5];
   float prot[5];
   float carb[5];
   float fat[5];
};

struct database main_m[200];

int main()
{
   FILE *fp;
   int i;
   for ( i = 0; i < 5; i++ )
   {
      printf("\nEnter product name for main %d:", i);
      scanf("%s", main_m[0].prod);

      printf("\nEnter amount of product in grams for %d:", i);
      scanf("%f", &main_m[0].amount[i]);

      printf("Enter calorie amount for %d:", i);
      scanf("%f", &main_m[0].cal[i]);

      printf("Enter protien value in grams for %d", i);
      scanf("%f", &main_m[0].prot[i]);

      printf("Enter Carbohydrate value in grams for %d:", i);
      scanf("%f", &main_m[0].carb[i]);

      printf("Enter fat content in grams for %d:", i);
      scanf("%f", &main_m[0].fat[i]);
   }

   fp = fopen("output.dat", "wb");
   if ( fp )
   {
      fwrite(main_m, sizeof *main_m, sizeof main_m / sizeof *main_m, fp);
      fclose(fp);
      fp = fopen("output.dat", "rb");
      if ( fp )
      {
         fread (main_m, sizeof *main_m, sizeof main_m / sizeof *main_m, fp);
         for ( i = 0; i < 5; i++ )
         {
            printf("%s\n", main_m[0].prod);
            printf("%f\n", main_m[0].amount[i]);
            printf("%f\n", main_m[0].cal[i]);
            printf("%f\n", main_m[0].prot[i]);
            printf("%f\n", main_m[0].carb[i]);
            printf("%f\n", main_m[0].fat[i]);
            getchar();
         }
         fclose(fp);
      }
   }
   return 0;
}

Even at that there's much more to do.

[voodoo3182]

Thankyou, I will look through it. By the way, Im just learning.