fprintf() and fscanf() in C

by Online Tutorials Library July 14, 2022

C fprintf() and fscanf()

Writing File : fprintf() function

The fprintf() function is used to write set of characters into file. It sends formatted output to a stream.

Syntax:

Example:

 #include  main(){    FILE *fp;    fp = fopen(“file.txt”, “w”);//opening file    fprintf(fp, “Hello file by fprintf…n”);//writing data into file    fclose(fp);//closing file } 

Reading File : fscanf() function

The fscanf() function is used to read set of characters from file. It reads a word from the file and returns EOF at the end of file.

Syntax:

Example:

 #include  main(){    FILE *fp;    char buff[255];//creating char array to store data of file    fp = fopen(“file.txt”, “r”);    while(fscanf(fp, “%s”, buff)!=EOF){    printf(“%s “, buff );    }    fclose(fp); } 

Output:

Hello file by fprintf...

C File Example: Storing employee information

Let’s see a file handling example to store employee information as entered by user from console. We are going to store id, name and salary of the employee.

 #include  void main() {     FILE *fptr;     int id;     char name[30];     float salary;     fptr = fopen(“emp.txt”, “w+”);/*  open for writing */     if (fptr == NULL)     {         printf(“File does not exists n”);         return;     }     printf(“Enter the idn”);     scanf(“%d”, &id);     fprintf(fptr, “Id= %dn”, id);     printf(“Enter the name n”);     scanf(“%s”, name);     fprintf(fptr, “Name= %sn”, name);     printf(“Enter the salaryn”);     scanf(“%f”, &salary);     fprintf(fptr, “Salary= %.2fn”, salary);     fclose(fptr); }

Output:

Enter the id  1 Enter the name  tutor Enter the salary 120000

Now open file from current directory. For windows operating system, go to TCbin directory, you will see emp.txt file. It will have following information.

emp.txt

Id= 1 Name= tutor Salary= 120000

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fprintf() and fscanf() in C

C fprintf() and fscanf()

Writing File : fprintf() function

Reading File : fscanf() function

C File Example: Storing employee information

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