NAME

get_float - prompt a user for a float

get_float - prompts user for a line of text from stdin and returns the equivalent float

SYNOPSIS

Header File

#include <cs50.h>

Prototype

float get_float(string prompt, ...);

#include <cs50.h>

float get_float(const char *format, ...);

DESCRIPTION

This function prompts the user for a float. If the user inputs anything other than a float (or a value that cannot fit in a float), the function prompts the user again.

This function expects at least one argument, prompt. If prompt contains any format codes, a la printf, this function accepts additional arguments as well, one per format code.

Prompts user for a line of text from standard input and returns the equivalent float as precisely as possible; if text does not represent a float or would cause underflow or overflow, user is reprompted.

The prompt is formatted like printf(3).

RETURN VALUE

This function returns the user’s input as precisely as possible as a float.

Returns the float equivalent to the line read from stdin in [FLT_MIN, FLT_MAX), as precisely as possible. If line can’t be read, returns FLT_MAX.

EXAMPLE

#include <cs50.h>
#include <stdio.h>

int main(void)
{
    float f = get_float("Input:  ");
    printf("Output: %f\n", f);
}

/**
 * Returns the product of two floats, or FLT_MAX on error.
 */
float multiply_floats(void)
{
    // read float from stdin
    float f = get_float("Enter a float: ");

    // make sure we read one successfully
    if (f == FLT_MAX)
    {
        return FLT_MAX;
    }

    float g = get_float("What do you want to multiply %f by? ", f);

    if (g == FLT_MAX)
    {
        return FLT_MAX;
    }

    return i * j;
}