I'm trying to develop a solution for my algoritms and data structures subject. I have a function that takes a student through a comparison of the number read by a number that exists in my database (corresponds to the number of lines).
Happens right then the system enter the meal, which is only 1 for each day of each week. So far, no problems.
The system checks the balance of the student, and if the student has 0.0 balance or less than 3 balance (which is the cost of each meal) the system prompts or automatically recommends loading the balance, and mostly do all the steps correctly.
It turns out, that maybe due to several implemented cycles, I have almost everything to go well but at the end of the function instructions the instructions remove(filename); andrename("backup.c",filename);`
CODE:
void EncomendaRefeicoes()
{
FILE *myFile;
FILE *fin, *fout;//ficheiro de entrada ficheiro de saida
const char *fn = "database-aluno.txt";
myFile = fopen(filename, "r");
int num; //numero
rewind(myFile);
printf("Insrira o numero de aluno");//Ask of number
scanf("%d", &num);//read number
printf("\n A verificar se o aluno existe!");//Check
//procurar estudante
int fnum = 0;//student number in file
struct Aluno student;
char fnom[50];//student file name
char saldotostring[5];//
double saldo;//saldo
//int i=0;
while (!(feof(myFile)))//enquanto difrente de fim de ficheiro(feof)
{
fscanf(myFile, "%d %s %s %lf %d-%d\n", &Aluno[acstruct].num, Aluno[acstruct].name, Aluno[acstruct].fname, &Aluno[acstruct].saldo, &Aluno[acstruct].dia, &Aluno[acstruct].mes);
//file scan as variaveis num,name,saldo,dia,mes
if (num == Aluno[acstruct].num) //se num lido == num ficheiro
{
printf("\n");
printf("\n");
printf("Aluno %d encontrado", num);//Dizer que foi encontrado
printf("\n");
printf("Numero: %d", Aluno[acstruct].num);//imprime numero
printf("\n");
printf("Nome: %s", Aluno[acstruct].name);//imnprime nome
printf("\n");
printf("Subnome: %s", Aluno[acstruct].fname);
printf("\n");
//sprintf(saldotostring, "%.2f", saldo);
printf("Saldo: %.2f", Aluno[acstruct].saldo);//imprime saldo
printf("\n");
printf("Custo de aquisicao: 3.00 euros \n");//diz qual o custo de aquisicao
printf("\n");
//Menu
SelectOneFood(6, fp1);
printf("\n");
printf("Quer enconendar? \n");
printf("1-Reservar \n");
printf("\n");
printf("2-Mandar-me para o menu principal \n");
int opcaoescolhida;
scanf("%d", &opcaoescolhida);
double price = 3.00;
if (opcaoescolhida == 1)
{
if (Aluno[acstruct].saldo == 0.0)
{
char op = 'N';
printf("Nao tem saldo. Deseja carregar o plafound? (Primir N para nao) \n");
/*
if (scanf("%c", op) == 'N')
{
_tmain();
}
*/
printf("Valor a inserir: ");
printf("\n");
scanf("%lf", &saldo);
if (saldo < 5.00)
{
printf("Minimo de carregamento obrigatorio e de 5 euros \n");
scanf("%lf", &saldo);
}
fin = fopen(fn, "r");
fout = fopen("sbackup.txt", "w");//an temporary file
rewind(fin);
rewind(fout);
while (!(feof(fin))){
//Lê 1 a 1
fscanf(fin, "%d %s %s %lf %d-%d\n", &Aluno[acstruct].num, Aluno[acstruct].name, Aluno[acstruct].fname, &Aluno[acstruct].saldo, &Aluno[acstruct].dia, &Aluno[acstruct].mes);
if (num == Aluno[acstruct].num)
fprintf(fout, "%d %s %s %lf %d-%d\n", Aluno[acstruct].num, Aluno[acstruct].name, Aluno[acstruct].fname, saldo, Aluno[acstruct].dia, Aluno[acstruct].mes);
else if (num != Aluno[acstruct].num)
fprintf(fout, "%d %s %s %lf %d-%d\n", Aluno[acstruct].num, Aluno[acstruct].name, Aluno[acstruct].fname, Aluno[acstruct].saldo, Aluno[acstruct].dia, Aluno[acstruct].mes);
}
remove(filename);
rename("sbackup.txt",filename);
printf("\n");
printf("Saldo alterado");
fclose(fout);
fclose(myFile);
fclose(fin);
}
/*
if (Aluno[acstruct].saldo < price)
printf("Voce nao tem saldo suficiente \n");
*/
else if (Aluno[acstruct].saldo >= price)
{
Aluno[acstruct].saldo = Aluno[acstruct].saldo - price;
//substiruir saldo no ficheiro de texto
printf("Refeicao adequerida com sucesso \n");
printf("Saldo Final %.2f euros", Aluno[acstruct].saldo);
}
}
if (opcaoescolhida == 2)
_tmain();
}
}
}
How can I solve this problem? It will be a problem in if and while cycles?
