Question

How to use setbuf() function to set a string as file buffer in C

Answer 1

#include <stdio.h>
   
int main(void)
{
	char buf[64] = "";
  
	FILE *fp1 = fopen("d:\\file1.txt", "w");
	FILE *fp2 = fopen("d:\\file2.txt", "w");

	setbuf(fp1, buf);
	fputs("file1.txt content - buffered stream", fp1);
	fflush(fp1);
	puts(buf);

	setbuf(fp2 , NULL);
	fputs("file2.txt content - unbuffered stream", fp2);
	puts(buf);

	fclose(fp1);
	fclose(fp2);
	
    return 0;
}
  
/*
run:
  
file1.txt content - buffered stream
file1.txt content - buffered stream

*/

 

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