C library function - ceil()

Description

The C library function double ceil(double x) returns the smallest integer value greater than or equal to x.

Declaration

Following is the declaration for ceil() function.

double ceil(double x)

Parameters

• x − This is the floating point value.

Return Value

This function returns the smallest integral value not less than x.

Example

The following example shows the usage of ceil() function.

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

int main () {
   float val1, val2, val3, val4;

   val1 = 1.6;
   val2 = 1.2;
   val3 = 2.8;
   val4 = 2.3;

   printf ("value1 = %.1lf\n", ceil(val1));
   printf ("value2 = %.1lf\n", ceil(val2));
   printf ("value3 = %.1lf\n", ceil(val3));
   printf ("value4 = %.1lf\n", ceil(val4));
   
   return(0);
}

Let us compile and run the above program that will produce the following result −

value1 = 2.0
value2 = 2.0
value3 = 3.0
value4 = 3.0