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C Program

Write a C program to read name and marks of n number of students

  • BY Team Educate
  • October 29, 2024
  • 0 Comments
  • 117 Views
c program 
#include <stdio.h>
int main()
{
char name[50];
int marks, i,n;
printf(“Enter number of students”);
scanf(“%d”, &n);
FILE *fptr;
fptr=(fopen(“C:\\student.txt”,”a”));
if (fptr==NULL){ printf("Error!");
exit(1);
}
for(i=0;i<n;++i)
{ printf("For student%d\nEnter name: ",i+1);
scanf("%s",name);
printf(“Enter marks”);
scanf(“%d”, &marks);
fprintf(fptr, “\nName: %s\nMarks=%d\n”, name, marks);
} fclose(fptr);
Return 0;
}

1. Include Directives

#include <stdio.h>: Includes the Standard Input Output library, allowing you to use functions like printf, scanf, and file handling functions.

2. Main Function

int main() {
  • This defines the main function, which is the entry point of the program.

3. Variable Declarations

char name[50]; // Array for student names int marks, i, n; // Marks, loop index, number of students
  • char name[50]: An array to store student names (up to 49 characters plus a null terminator).
  • int marks: Variable to store each student’s marks.
  • int i, n: i is used for looping, and n stores the number of students.

4. User Input

printf("Enter number of students: "); scanf("%d", &n);
  • Prompts the user to enter the number of students and reads that value into n.

5. File Handling

FILE *fptr; // Declare a file pointer fptr = fopen("C:\\student.txt", "a"); // Open file in append mode
A file pointer fptr is declared, and fopen is used to open student.txt in append mode ("a"). This allows new entries to be added to the end of the file.

6. Error Checking

if (fptr == NULL) 
{ 
printf("Error!"); 
exit(1); 
}
Checks if the file was successfully opened. If fptr is NULL, it indicates a failure to open the file, and the program prints an error message and exits with a status of 1.

7. Input Loop

for (i = 0; i < n; ++i)
 { 
printf("For student %d\nEnter name: ", i + 1); 
scanf("%s", name);
printf("Enter marks: ");
scanf("%d", &marks); 
fprintf(fptr, "\nName: %s\nMarks = %d\n", name, marks);
 }
This loop runs n times to gather input for each student:
  • It prompts the user for the name and reads it into the name array.
  • It then prompts for the student’s marks and stores that in marks.
  • Finally, it writes the name and marks to the file using fprintf.

8. Closing the File

fclose(fptr);
  • Closes the file after all student data has been written, ensuring that all data is saved properly.

9. Return Statement

return 0;
  • Indicates that the program completed successfully.

 

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