Entering floating numbers

This is a discussion on Entering floating numbers within the C Programming forums, part of the General Programming Boards category; Hi, I'm trying to write a little program that will help me calculate minority and majority carriers in semiconductors based ...

  1. #1
    Registered User
    Join Date
    Aug 2003
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    34

    Entering floating numbers

    Hi,

    I'm trying to write a little program that will help me calculate minority and majority carriers in semiconductors based on my input. The program should handle large numbers, typically around 10^12-10^17.

    However, I'm stuck on the very start:

    Code:
    #include <stdio.h>
    
    int main() {
    
    	double d=0;
    
    	scanf("%e", &d);
    	printf("%e\n", d);
    
    	return 0;
    
    }
    I'm sure something is wrong with this code, but what? For example, when I type in 15, it prints out 5.424145e-315.

  2. #2
    & the hat of GPL slaying Thantos's Avatar
    Join Date
    Sep 2001
    Posts
    5,681
    Code:
    #include <stdio.h>
    
    int main() {
    
    double d=0;
    
    scanf("%le", &d);
    printf("%e\n", d);
    
    return 0;
    
    }
    %e is the same as %f which is for float. %le makes it a double (at least on gcc)

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