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Unexpected Output In Structures

 
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Unexpected Output In Structures
aaru_89
27 Sep, 2006 - 08:44 AM
Post #1

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Hello. I am new to C and I was trying to find the answer for the following program to illustrate structures


CODE
#include<stdio.h>
void main()
  {
    struct student{int roll,age;
                        char sex;
                        float height,weight;}
                       s1={101,23,'M',163.2,31.3};
    printf("\n %d %d %c %f %f",s1.roll,s1.age,s1.sex,s1.height,s1.weight);
    getch();
  }



I thought the output would be

101 23 M 163.2 31.3

But what I got while I ran the program was this

101 23 M 163.199997 31.299999

Can someone please explain why this happened. Thanks.
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Jayman
RE: Unexpected Output In Structures
27 Sep, 2006 - 11:11 AM
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QUOTE(aaru_89 @ 27 Sep, 2006 - 09:44 AM) *

I thought the output would be

101 23 M 163.2 31.3

But what I got while I ran the program was this

101 23 M 163.199997 31.299999

Can someone please explain why this happened. Thanks.


You need to set the precision of your float variables in order to only get 1 number after the decimal point.

CODE
#include<stdio.h>
void main()
  {
    struct student{int roll,age;
                        char sex;
                        float height,weight;}
                       s1={101,23,'M',163.2,31.3};
    printf("\n %d %d %c %.1f %.1f",s1.roll,s1.age,s1.sex,s1.height,s1.weight);
    getch();
  }


Check the following link for info on floats precision.
http://support.microsoft.com/kb/q125056/
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born2c0de
RE: Unexpected Output In Structures
27 Sep, 2006 - 11:20 AM
Post #3

printf("I'm a %XR",195936478);
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There's even a programmer joke because of this problem:
QUOTE

2 + 2 = 5 for extremely large values of 2.
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