ceil in c

What is ceil in c programming?

ceil in c is library function which is used to find out integer value greater than or equal to the given number.

This function is defined in math.h header file.

Prototype

double ceil(double m);
float ceilf(float y);
long double ceill(long double y);

Parameters

ceil function takes floating point number as input parameter.

Return value

ceil function returns integer value greater than or equal to the given number.

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Example program for ceil in c

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

int main() 
{
   float val=1.6;
   printf("ceil value is %lf \n",ceil(val));
   return 0;
}

While using gcc use below command to add math header.

gcc file_name.c -lm

Code explanantion

The ceil value of a given number is found by calling ceil function and the result is printed onto the console.

ceil() Man page

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Difference between ceil and floor

ceil in c is used to find out the nearest integer value which is greater than or equal to the given number. The floor in c is used to find out the nearest integer value which is less than or equal to the given value.

Prototypes are as follows

double ceil(double y);
float ceilf(float y);
long double ceill(long double y);

double floor(double y);

ceil( )	floor( )
Used to find out nearest integer value which is greater than or equal to given number.	Used to find out nearest integer value which is less than or equal to the given value.
double ceil(double y); float ceilf(float y); long double ceill(long double y);	double floor(double y);

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Difference between ceil and abs in c

ceil in c is used to find out the nearest integer value which is greater than or equal to the given number. abs in c is used to find out the absolute value of a given number.

ceil is included in math.h header file. abs is included in stdlib.h header file.

Prototypes are as follows

double ceil(double y);
float ceilf(float y);
long double ceill(long double y);


int abs(int m);

ceil( )	abs( )
Used to find out nearest integer value which is greater than or equal to given number.	Used to find out absolute value of given number.
double ceil(double y); float ceilf(float y); long double ceill(long double y);	int abs(int m);

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