Team and Fight Randomizer in C - c

Question

I'm trying to make a program, which puts a given amount of players in a given amount of teams. Afterwards they should be randomly chosen (eg. you roll the "dice" and Team 3's Player 42 and shall fight against Team 4's Player 22 (All the players are randomly put in the different teams, which are limited to the choice of the Gamemaster)).
In my code I have the basic output and structure. It says something like:
Team 1 now owns Player 43
Team 2 now owns Player 12
Team 4 now owns Player 1
Team 3 now owns Player 54
But my question is, how - based on the code - I could save this information and how can I (afterwards) let the players randomly fight? Members of the same team should NOT be able to fight each other and after each fight I want the players to be somehow on a "blacklist" where they can't be rolled anymore.
My code so far
#include <stdio.h>
#include <stdlib.h>
int main()
{
int mitglieder, teams, teameins = 0, teamzwei = 0, teamdrei = 0, teamvier = 0;
printf("Teamcreation\n");
printf("\nNumber of Players: ");
scanf("%d", &mitglieder);
printf("\nNumber of Teams: ");
scanf("%d", &teams);
printf("\nThere are ");
printf("%d", mitglieder);
printf(" Player in ");
printf("%d", teams);
printf(" Teams. \n");
int array[mitglieder];
for (int i = 0; i < mitglieder; i++)
{ // fill array
array[i] = i;
}
printf("The Player are in the following Teams: \n ");
for (int i = 0; i < mitglieder; i++)
{ // shuffle array
int temp = array[i];
int randomIndex = rand() % mitglieder;
array[i] = array[randomIndex];
array[randomIndex] = temp;
}
for (int i = 0; i < mitglieder; i++)
{ // print array
int random_number = rand() % teams + 1;
int tp = random_number;
if(tp == 1)
{
teameins+1;
}
else if(tp == 2)
{
teamzwei+1;
}
else if(tp == 3)
{
teamdrei+1;
}
else if(tp == 4)
{
teamvier+1;
}
printf("Team %d - Spieler: %d\n ",random_number,array[i] + 1);
}
if( (teamvier == 0) && (teamdrei == 0) )
{
printf("\n%d Mitglieder in Team 1 und %d Mitglieder in Team2",teameins,teamzwei);
}
else if((teamvier == 0) && (teamdrei < 0))
{
printf("\n%d Mitglieder in Team 1, %d Mitglieder in Team2 und %d Mitglieder in Team3.",teameins,teamzwei,teamdrei);
}
else if(teamvier < 0)
{
printf("\n%d Mitglieder in Team 1, %d Mitglieder in Team2, %d Mitglieder in Team 3 und %d Mitglieder in Team4.",teameins,teamzwei,teamdrei,teamvier);
}
return 0;
}

Answer 1

Before basing something on the given code, you should correct the errors in it, which are within the counting of team members and the printing of the counts. While you're at it, you could make it work also for more than four teams, e. g.:
#include <string.h>
…
int Spielerteam[mitglieder]; // team of the player
int Teamstaerke[teams]; // team member counts
memset(Teamstaerke, 0, sizeof Teamstaerke); // zero the counts
for (int i = 0; i < mitglieder; i++)
{ // print array
int random_number = rand() % teams;
int tp = random_number + 1;
Spielerteam[i] = tp; // save player's team information
Teamstaerke[random_number]++; // count the member
printf("Team %d - Spieler: %d\n ", tp, array[i] + 1);
}
for (int i = 0; i < teams; i++)
printf("%s%d Mitglieder in Team %d",
i ? i+1 == teams ? " und " : ", " : "\n", Teamstaerke[i], i+1);
puts("");
After that, the team each player array[i] + 1 belongs to is saved in Spielerteam[i].