SAS/C Library Reference, Vol. 1

ceil -- Round Up a Floating-Point Number

SYNOPSIS

 #include <math.h>

 double ceil(double y);

DESCRIPTION

ceil rounds up a real number to the next larger integral real number.

RETURN VALUE

ceil accepts a floating-point argument y and rounds it up to the next larger integer, expressed as a floating-point number.

IMPLEMENTATION

ceil is implemented by a built-in function unless it is undefined by an #undef statement.

EXAMPLE

  #include <math.h>
  #include <stdio.h>

  int moda, modb, df;
  double score, rank;

  main()
  {
     puts("Enter two integers: ");
     scanf("%d %d", &moda, &modb);
     puts("Enter an integer divisor: ");
     scanf("%d",&df);

        /* Add the two numbers, divide by the given divisor, and */
        /*  then round up to the closest integer greater than    */
        /*  the result.                                          */
     score = (moda + modb);
     score /= df;
     rank = ceil(score);

        /* Print this rounded result (its "ceil"ed value).       */
     printf("The ceiling of (%d + %d)/ %d = %fn",moda,modb,df,rank);
  }

RELATED FUNCTIONS

floor