C ceil() function

C ceil() function - Find integer


double ceil(double x)

The ceil() function is used to compute the smallest integer that is greater than or equal to x.


Name Description Required /Optional
x Floating-point value. Required

Return value from ceil()

  • Returns the integer as a double value.

Example: ceil() function

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

#include <math.h>
#include <stdio.h>
int main(void)
   double x, y, z;
   x = 123.345;        
   y = 1.05;        
   z = -1.05;       
   printf("Before applying ceil():");
   printf("\nx = %.3f ; y = %.2f ; z = %.2f\n", x, y, z);
   x = ceil(123.345);        
   y = ceil(1.05);        
   z = ceil(-1.05);       
   printf("\n\nAfter applying ceil():");
   printf("\nx = %.3f ; y = %.2f ; z = %.2f\n", x, y, z);


Before applying ceil():
x = 123.345 ; y = 1.05 ; z = -1.05

After applying ceil():
x = 124.000 ; y = 2.00 ; z = -1.00

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C Programming: Tips of the Day

What's the point of const pointers?

const is a tool which you should use in pursuit of a very important C++ concept:

Find bugs at compile-time, rather than run-time, by getting the compiler to enforce what you mean.

Even though it does not change the functionality, adding const generates a compiler error when you're doing things you didn't mean to do. Imagine the following typo:

void foo(int* ptr)
    ptr = 0;// oops, I meant *ptr = 0

If you use int* const, this would generate a compiler error because you're changing the value to ptr. Adding restrictions via syntax is a good thing in general. Just don't take it too far -- the example you gave is a case where most people don't bother using const.

Ref : https://bit.ly/33Cdn3Q