Doubt in C

Blog Category: cfzr.com — Blogged by: jane on March 12, 2010 at 1:10 pm
  • Dunno whether its right to post it here....

    Anyway, this is my doubt:

    i couldn't find this in Google.......

    ---> if we declare a float, like:

    float a=2.7;

    it gets stored in the memory as 2.700000 with specifically 6 digits only, after the decimal point. Why? (may be related to its format)


  • U can set any precision u want! Check my code

    U can set any precision using setprecision! Don't try large numbers or ur terminal might hang! I tried "100000000000" as precision and had to kill the program then!! ;)
    Buddy, abhi_10_20 is talking about C. Your code is C++! :)


  • Dunno whether its right to post it here....

    Anyway, this is my doubt:

    i couldn't find this in Google.......

    ---> if we declare a float, like:

    float a=2.7;

    it gets stored in the memory as 2.700000 with specifically 6 digits only, after the decimal point. Why? (may be related to its format)
    It's predefined in the compiler. This is probably the wrong sect. it shud go in s/w troubleshooting. :)


  • thanks for your replies......

    but still not satisfied somewhat...
    i think it goes with the storage space reserved........like float requires 4 bytes
    in a standard turbo c compiler.....and we need to do some 'masala munch' with these 4 bytes.....


  • Ha hA ha ha. :lol:

    Or u better start trusting the replies in here .. Shilesh is perfectly correct .. it's 6 point precision by default and u cannot do anything about it if u want the value just 1 or 2 places do it just like it's written .. change the precision of output wid
    printf("salary is %.3fn", salary );

    being more clear this will print upto 3 places after decimal if u write
    printf("salary is %.2fn", salary );

    this prints 2 values and so on ..


  • ^^But his precise problem is about float!


  • snip


    :shock: this book is "W. Kernighan and Dennis M. Ritchie" is it not a voilation.. if so then remove the link please..


  • U can set any precision u want! Check my code

    #include
    #include
    int main()
    {
    int p;
    cout<<"Mediator asked to enter precision u wanna set : "; cin>>p;
    double x(3.14);
    cout <<"x = "< cout <<"x/3 = "< return 0;
    }

    U can set any precision using setprecision! Don't try large numbers or ur terminal might hang! I tried "100000000000" as precision and had to kill the program then!! ;)


  • another c book into my kitty........
    man...i can start a big library with my pdf's....


  • Yes by default it is upto 6 point decimal...

    But if you want it to 3 point decimal than use %.3f in the print statement to get result in upto 3 place of decimal

    e.g.

    printf("salary is %.3fn", salary );

    For in depth Knowledge read Dennis Ritche


  • setprecision is found from library "iomanip.h" and it doesn't matter if its c or c++ afaik!


  • If you want a detailed manual on programming in C, see snip


    Same book i was talkin about..

    in the pdf mentiontioned page number 22 gives the idea about your problem


  • another c book into my kitty........
    man...i can start a big library with my pdf's....
    Ha hA ha ha. :lol:


  • isn't setprecision() found in C ?


  • :shock: this book is "W. Kernighan and Dennis M. Ritchie" is it not a voilation.. if so then remove the link please..
    I don't know. It was given to me by a frnd. :?:


  • ^^But his precise problem is about float!
    ok. :)


  • If you want a detailed manual on programming in C, see snip

    i have uploaded it. :)
    __________
    After giving the captcha code, wait 30 secs. goto the bottom. when the downlaod now button gets activated, click it to download. Don't use any d/w manager. :)
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