Can someone help me with the Pointers in function, in this code?

Question

Guys, after implementing the function deleting my code no longer works, could someone help me? without deleting function is working, what is wrong with it?

//biblioteca

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

// Constantes 

#define MAX 2

//Estruturas

typedef struct aluno{
    int matricula;
    int cpf;
}aluno;



//funçoes
void inserir(int qtd_aluno , aluno *a){

    for( int i = 0 ; i < qtd_aluno ; i++){
        printf("1 - Inserir Aluno>>\n");
        printf("Digite a matricula: \n");
            scanf("%d", &a[i].matricula);
        printf("Digite o cpf: \n");
            scanf("%d", &a[i].cpf);

    }   
}

void buscar(aluno *a){
    int i;
    int cpfb;
    printf("2 - Buscar Aluno\n\n");

    printf("Digite o cpf do aluno a ser buscado: ");
        scanf("%d",&cpfb);
    for (int i = 0; i < MAX; i++)
        if (cpfb == a[i].cpf)
            printf("\nAluno encontrado!\n Aluno numero: %d\n Matricula: %d", i+1,a[i].matricula);

        else
            printf("Aluno nao econtrado!"); 
}



void relatorio(aluno *a){

    printf("4 - Gerar Relatorio...\n\n");
    for (int i = 0; i < MAX; i++){
        printf("Matricula do Aluno: %d\n", a[i].matricula);
        printf("cpf do Aluno: %d\n", a[i].cpf);
    }

}


void deletar(int qtd_aluno, aluno *a){
    int matcomp, i=0;

    printf("\n 3 - Deletar Aluno \n");
    relatorio(a);
    printf("Digite a matricula do aluno que deseja deletar.");
    scanf("%d",&matcomp);
    for(i=0; i<qtd_aluno;i++){
        if(matcomp == a[i].matricula){
            &a[i].matricula = 0;
            &a[i].cpf= 0;
        }

    }


}


//funçao main
int main ()
{

    int op ;
    aluno a[MAX];

    do {

    printf(" ------------- Cadastro de Alunos -------------\n\n");
    printf(" --------- Insira a opcao de cadastro ----------\n\n");
    printf("| 1 - Inserir Aluno                            |\n");
    printf("| 2 - Buscar Aluno                             |\n");
    printf("| 3 - Deletar Aluno                            |\n");
    printf("| 4 - Gerar um Relatorio                       |\n");
    printf("| 5 - Sair                                     |\n");
    printf(" -----------------------------------------------\n\n"); 
    scanf("%d",&op);

        switch(op){
            case 1 : 
                system("cls");
                inserir(MAX , a);
                break;
            case 2 : 
                system("cls");
                buscar(a);
                break;
            case 3 : 
                system("cls");
                deletar(a);
                break;
            case 4 : 
                system("cls");
                relatorio(a);
                break;
            case 5 : 
                system("cls");
                printf("5 - Saindo...");
                break;
            default : 
                system("cls");
                printf("Opcao Invalida - Faça novamente");
                break;
        } 
    }while (op != 5);
return 0;
}

Answer 1

Taking a quick look, you created the function void deletar(int qtd_aluno, aluno *a) with two parameters and in function call deletar(a); used only one parameter. This is only possible if you implement optional parameters.