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File Output in C Language | Write data into file in C Language | fputc(), putc(), putw(), fputs(), fprintf() function in C language

Different predefined functions of C language for file input/output are:

1. fputc()/putc() function

These functions are used to insert single character to a specified file.

Syntax:

fputc(C, Fpointer);

putc(C, Fpointer);

C refers to character variable or constant whose value should be stored into a file.

Fpointer is the file pointer variable .

Program to demonstrate fputc()/putc().

#include<stdio.h>
int main()
{
FILE *f1;
char s;
f1=fopen(“myfile.txt”,”w”);
printf(“Enter any character:”);
scanf(“%c”,&s);
fputc(s,f1); //or putc(s,f1);
fclose(f1);
printf(“character stored in file”);
return(0);
}

Output

Enter any character :k
character stored in file

2. putw() function

putw() is used to insert an integer value to a file.

Syntax :

putw(Val, Fpointer);

Val refers to integer variable or constant whose value is to be written into a file.

Fpointer refers to the file pointer variable.

Program to demonstrate putw().

#include<stdio.h>
int main()
{
FILE *f1;
int n;
f1=fopen(“integer.txt”,”w”);
printf(“Enter any integer value:”);
scanf(“%d”,&n);
putw(n,f1);
fclose(f1);
printf(“Integer value inserted” );
return(0);
}

Output

3. fputs() function

fputs() function is used to write a string value to a file.

Syntax:

fputs(S , Fpointer);

S represents the string variable or constant whose value is to be written into a file.

Fpointer represents file pointer variable.

Program to demonstrate fputs().

#include<stdio.h>
int main()
{
FILE *f1;
char n[100];
f1=fopen(“words.txt”,”w”);
printf(“Enter a string=”);
gets(n);
fputs(n,f1); //inserstring value in file
fclose(f1);
printf(“\nstring stored in file”);
return(0);
}

Output

Enter a string=This is a string value
string stored in file

4. fprintf() function

This function is used to insert values of different types to a file.

Syntax:

fprintf(Fpointer,”Control-String”, var1,var2,….);

F is the file pointer variable used to refer a file.

Control-string contains conversion characters like %d, %f, %s to insert values of different data types into a file.

var1,var2,…. are variables or values we want to insert into file.

Program to demonstrate fprintf() function

#include<stdio.h>
int main()
{
FILE *f1;
int empid;
char ename[20];
f1=fopen(“emp.dat”,”w”);
printf(“Enter employee id:”);
scanf(“%d”,&empid);
printf(“Enter employee name:”);
fflush(stdin);
gets(ename);
fprintf(f1,”%d%s”,empid,ename);
fclose(f1);
return(0);
}

Output

Enter employee id:101
Enter employee name:Sahil

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Lesson tags: File Input output in C in c, fprintf() function in c, fputc() function in c, fputs() function in c, fscanf() function in c, put content into file in c, putc() in c, putw() function in c

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