How would I convert this cpp code to tge compliant ?

I'm trying to merge some old cpp code I have into my tge build.

But I'm not sure how to "convert" the variable types and such to be tge compatible --

i.e. I'm trying to do with .cc code not .cs script.

Here are some of the examples;

int d100(void)
{
 return ((rand() % 100) + 1);
}

or a basic printf ... to dump something to console or such.

...
      printf("nArmor:(%2d) %s",ArmorType,armor_name);
...

or even more complex, load data from a text file

struct wpn_type
 {
  char   name[25];
  int    fumble;
  char   crit[5];
  int    table;
  int    mod_ob[5];
  float  mod_hp[5];
  int    str;
  int    BF;
  int    category;
 };

 wpn_type wpns[49];

int load_weapons(void)
{
      FILE *in2 = fopen("weapons.dat","r");
      int loop;

      if (in2 == NULL)
      {
       printf("error - unable to load weapons.dat n");
       return -1;
      }

      for (int i=0; i < MAX_WEAPONS; i++)
       {
        fscanf(in2,"%s ",&wpns[i].name);
        fscanf(in2,"%d ",&wpns[i].fumble);
        fscanf(in2,"%c ",&wpns[i].crit[0]);
        fscanf(in2,"%c ",&wpns[i].crit[1]);
        fscanf(in2,"%c ",&wpns[i].crit[2]);
        fscanf(in2,"%d ",&wpns[i].table);

        for (loop=0; loop < 5; loop++)
         {
          fscanf(in2,"%d ",&wpns[i].mod_ob[loop]);
          fscanf(in2,"%f ",&wpns[i].mod_hp[loop]);
         };

        fscanf(in2,"%d ",&wpns[i].str);
        fscanf(in2,"%d ",&wpns[i].BF);
        fscanf(in2,"%d ",&wpns[i].category);
       };

      fclose(in2);

      return 1;
}

Anything constructive would be appreciated -