Please help me correct my C code in visual studios. My code asks me to enter nam
ID: 3574029 • Letter: P
Question
Please help me correct my C code in visual studios.
My code asks me to enter names from a .txt file then if the names are valid i can log in.
When the program launches the user should be presented with three options; Press 0 to exit Press 1 for author info Press 2 to Log in Selecting 0 exits the program Selecting 1 prints your name and student id Selecting 3 prompts the user to enter a user name and password. You should then open the file "passwords" and see if the user is authorized to use the program*
I have done this so far. Once i have successfully logged in I can press option 2 to add a new student. I have done that so far. Now I have made a mistake for option 4. Option 4 asks me to enter a grade for the student. After hitting option 4 it asks me for the grade, whenever i enter a grade the program just crashes on me. I am not sure what my error is.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Constants used in the application */
const char * PASSWORD_FILE = "passwords.txt";
const int MAX_STUDENTS = 1000;
const int MAX_GRADES = 100;
const int MAX_CHARS = 25;
//Function to print Author Info
void printAuthorInfo();
//Function to display initial Menu and Get the User's Selection
int showMainMenu();
//Function to Login to the System
int login();
//member menu
int memberMenu();
//Enter GPA for current Student
void enterGPA(char ids[1000][25], float grades[1000][100], int[], int);
//Display student records to stdout
void print(char[1000][25], char[1000][25], char[1000][25], float[1000][100], int[], int);
//Save Records to File
void save(char[1000][25], char[1000][25], char[1000][25], float[1000][100], int[], int);
//Load Records from File
void load(char fn[1000][25], char ln[1000][25], char ids[1000][25], float grades[1000][100], int counts[], int num);
int main()
{
int loggedIn = 0;
int choice, subChoice;
char firstNames[1000][25];
char lastNames[1000][25];
char ids[1000][25];
float grades[1000][100];
int numGrades[1000];
char fn[25];
char ln[25];
int numStudents = 0;
//Top Level Loop
do {
//display menu and get the user's selection
choice = showMainMenu();
if (choice == 0)
{
printf("Thank you for using our Application! GoodBy!");
}
else if (choice == 1)
{
printAuthorInfo();
}
else if (choice == 2)
{
loggedIn = login();
if (loggedIn == 1)
{
printf("Welcome! You are now Logged In ");
//Interact with the user
do
{
subChoice = memberMenu();
if (subChoice == 1)
{
printAuthorInfo();
}
else if (subChoice == 2)
{
printf("Enter First Name: ");
scanf("%s", firstNames[numStudents]);
printf("Enter Last Name: ");
scanf("%s", lastNames[numStudents]);
printf("Enter Student ID: ");
scanf("%s", ids[numStudents]);
numStudents++;
printf("Student Has been added to System");
}
else if (subChoice == 3)
{
enterGPA(ids, grades, numGrades, numStudents);
}
else if (subChoice == 4)
{
print(firstNames, lastNames, ids, grades, numGrades, numStudents);
}
else if (subChoice == 5)
{
void save(firstNames, lastNames, ids, grades, counts, numStudents);
}
else if (subChoice == 6)
{
load(firstNames, lastNames, ids, grades, numGrades, &numStudents);
}
else if (subChoice == 7)
{
printf(" You are logged Out Now");
}
printf(" ");
} while (subChoice != 7);
}
else
{
printf("Login Failed - Try again");
}
}
printf(" ");
} while (choice != 0);
system("pause");
return 0;
}
void printAuthorInfo()
{
printf("Author Information ");
printf("Author Name: %s ", "Abdulelah Aldhafyan");
printf("Student ID: %s ", "2593742");
}
int showMainMenu()
{
//User Selection
int choice;
do
{
//Display menu
printf("Press 0 to exit ");
printf("Press 1 for Author Info ");
printf("Press 2 for Login ");
printf("Enter choice? ");
//Read the selection
scanf("%d", &choice);
printf(" ");
} while (choice < 0 || choice > 2);
//Return selection
return choice;
}
int login()
{
//Get User's username and password
char username[30];
char password[30];
char usernameInFile[30];
char passwordInFile[30];
int valid = 0;
//Prompt and get Username
printf("Enter Username: ");
scanf("%s", username);
//Prompt and get Password
printf("Enter Password: ");
scanf("%s", password);
//Open the input file
FILE * fptr = fopen(PASSWORD_FILE, "r");
while (fscanf(fptr, "%s %s", usernameInFile, passwordInFile) == 2)
{
if (strcmp(username, usernameInFile) == 0 && strcmp(password, passwordInFile) == 0)
{
valid = 1;
}
}
fclose(fptr);
return valid;
}
int memberMenu()
{
int choice = 0;
do
{
printf("Press 1 for author info ");
printf("Press 2 to Enter new student ");
printf("Press 3 to enter grade for existing student ");
printf("Press 4 to print student records ");
printf("Press 5 to save student records ");
printf("Press 6 to load student records ");
printf("Press 7 to logout Enter Selection? ");
scanf("%d", &choice);
printf(" ");
} while (choice < 1 || choice > 7);
return choice;
}
void print(char fn[1000][25], char ln[1000][25], char ids[1000][25], float grades[1000][100], int counts[], int num)
{
int i, j;
float sum, avg;
sum = 0;
avg = 0;
printf("%-15s %-15s %-10s %-8s %-8s ", "First Name",
"Last Name", "Std ID", "GPA", "Grades");
for (i = 0; i < num; i++)
{
printf("%-15s %-15s %-10s", fn[i], ln[i], ids[i]);
for (j = 0; j < counts[i]; j++)
{
sum += grades[i][j];
}
avg = sum / counts[i];
sum = 0;
printf("%-8.2f", avg);
for (j = 0; j < counts[i]; j++)
{
printf("%-6.2f", grades[i][j]);
}
printf(" ");
}
}
void save(char fn[1000][25], char ln[1000][25], char ids[1000][25], float grades[1000][100], int counts[], int num)
{
int i, j;
float sum, avg;
char fname[100];
sum = 0;
avg = 0;
//Get file name
printf("Enter Output File Name: ");
scanf("%s", fname);
FILE * fptr = fopen(fname, "w");
fprintf(fptr, "%d ", num);
for (i = 0; i < num; i++)
{
fprintf(fptr, "%s %s %s %d ", fn[i], ln[i], ids[i], counts[i]);
for (j = 0; j < counts[i]; j++)
{
fprintf(fptr, "%.2f ", grades[i]);
}
fprintf(fptr, " ");
}
fclose(fptr);
}
void load(char fn[1000][25], char ln[1000][25], char ids[1000][25], float grades[1000][100], int counts[], int *num)
{
char fname[100];
int cur = *num;
int i, j, n, numStudents = 0;
float grade;
//prompt and get input file
printf("Enter Input File Name: ");
scanf("%s", fname);
//open file to read
FILE * fptr = fopen(fname, "r");
fscanf(fptr, "%d", &numStudents);
for (i = 0; i < numStudents && cur < 1000; i++)
{
fscanf(fptr, "%s %s %s %d", fn[cur], ln[cur], ids[cur], &n);
for (j = 0; j < n && counts[i] < 100; j++)
{
fscanf(fptr, "%f", &grade);
grades[i][counts[i]] = grade;
counts[i] += 1;
}
cur += 1;
}
*num = cur;
fclose(fptr);
}
void enterGPA(char ids[1000][25], float grades[1000][100], int counts[], int num)
{
char id[25];
int i, idx;
float gpa;
idx = -1;
printf("Enter Student ID: ");
scanf("%s", id);
//find student
for (i = 0; i < num && idx == -1; i++)
{
if (strcmp(id, ids[i]) == 0)
{
idx = i;
}
}
if (idx >= 0)
{
printf("Enter Grade: ");
scanf("%f", &gpa);
grades[idx][counts[idx]] = gpa;
counts[idx] += 1;
}
else
{
printf("NO Such Student Exist In The System");
}
}
Explanation / Answer
your code is getting crashed in this code:
void enterGPA(char ids[1000][25], float grades[1000][100], int counts[], int num)
{
char id[25];
int i, idx;
float gpa;
idx = -1;
printf("Enter Student ID: ");
scanf("%s", id);
//find student
for (i = 0; i < num && idx == -1; i++)
{
if (strcmp(id, ids[i]) == 0)
{
idx = i;
}
}
if (idx >= 0)
{
printf("Enter Grade: ");
scanf("%f", &gpa);
grades[idx][counts[idx]] = gpa; //--------<--------error at this line
counts[idx] += 1;
}
else
{
printf("NO Such Student Exist In The System");
}
}
This error is because of the count array. Your code is not running in visual studio giving linking error
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