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Full Discussion: Clear standard input buffer for C program in Linux
Top Forums Programming Clear standard input buffer for C program in Linux Post 302912420 by Abhishek_kumar on Friday 8th of August 2014 05:48:55 AM
Old 08-08-2014
Ubuntu Clear standard input buffer for C program in Linux
Hello friends! i am writing a code in which i take inputs (numbers) from user and count the total number of positive, negative and zeros entered. I need to clear my standard input buffer before scanf() command. My compiler is completely ignoring the fflush(stdin) command. its not even showing any error!. I am using Linux(ubunto) platform. Help!
Code:
#include<stdio.h>
int main()
{
	int pos=0,neg=0,zeros=0;
	float num;
	char ans='y';
	while(ans=='y')
	{
		printf("Enter a number : ");
		scanf("%f",&num);
		if(num>0)
		{
			pos++;
		}
		else if(num<0)
		{
			neg++;
		}		
		else
		{
			zeros++;
		}		
		
		printf("Wanna enter another number ? (y/n)\n");
		fflush(stdin);			
		scanf("%c",&ans);			
		if(ans=='n')
		{
		printf("positive number : %d \n Negative numbers : %d \n Zeros : %d",pos,neg,zeros);
		}

	}
return 0;
}

Last edited by Abhishek_kumar; 08-08-2014 at 02:27 PM..
 

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LEARN ABOUT SUNOS

frexpl

frexp(3M)						  Mathematical Library Functions						 frexp(3M)

NAME

       frexp, frexpf, frexpl - extract mantissa and exponent from a floating-point number

SYNOPSIS

       cc [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double frexp(double num, int *exp);

       float frexpf(float num, int *exp);

       long double frexpl(long double num, int *exp);

DESCRIPTION

       These functions break a floating-point number into a normalized fraction and an integral power of 2. They store the integer exponent in the
       int object pointed to by exp.

RETURN VALUES

       For finite arguments, these functions return the value x, such that x is a double with magnitude in the interval [1/2, 1)  or  0,  and  num
       equals x times 2 raised to the power *exp.

       If num is NaN, NaN is returned and the value of *exp is unspecified.

       If num is +- 0, +- 0 is returned and the value of *exp is 0.

       If num is +-Inf, num is returned and the value of *exp is unspecified.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       isnan(3M), ldexp(3M), modf(3M), attributes(5), standards(5)

SunOS 5.10							    16 Aug 2004 							 frexp(3M)
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