NAME

get_int - prompt a user for an int

get_int - prompts user for a line of text from stdin and returns the equivalent int

SYNOPSIS

Header File

#include <cs50.h>

Prototype

int get_int(string prompt, ...);

#include <cs50.h>

int get_int(const char *format, ...);

DESCRIPTION

This function prompts the user for an int. If the user inputs anything other than an int (or a value that cannot fit in an int), 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 int; if text does not represent an int or would cause overflow, user is reprompted.

The prompt is formatted like printf(3).

RETURN VALUE

This function returns the user’s input as a int.

Returns the int equivalent to the line read from stdin in [INT_MIN, INT_MAX). If line can’t be read, returns INT_MAX.

EXAMPLE

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

int main(void)
{
    int i = get_int("Input:  ");
    printf("Output: %i\n", i);
}

/**
 * Returns the sum of two ints read from stdin, or INT_MAX if there was an error.
 */
int add_ints(void)
{
    // read int from stdin
    int i = get_int("Enter an int: ");

    // make sure we read one successfully
    if (i == INT_MAX)
    {
        return INT_MAX;
    }

    int j = get_int("What do you want to add %d to? ", i);

    if (j == INT_MAX)
    {
        return INT_MAX;
    }

    return i + j;
}