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Discussion :: Floating Point Issues

  1. What will be the output of the program?

     #include
 #include<math.h>
 int main() 
  {   
    float n=1.54;  
    printf("%f, %f\n", ceil(n), floor(n));   
    return 0; 
  }

    2. A.

    2.000000, 1.000000
    B.

    1.500000, 1.500000
    C.

    1.550000, 2.000000
    D.

    1.000000, 2.000000

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    Answer : Option A

    Explanation :

    ceil(x) round up the given value. It finds the smallest integer not x.
    floor(x) round down the given value. It finds the smallest integer not > x.

    printf("%f, %f\n", ceil(n), floor(n)); In this line ceil(1.54) round up the 1.54 to 2 and floor(1.54) round down the 1.54 to 1.

    In the printf("%f, %f\n", ceil(n), floor(n)); statement, the format specifier "%f %f" tells output to be float value. Hence it prints 2.000000 and 1.000000.

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