C math ceil library function

The ceil() function in C is used to return the next highest integer value by rounding up value if necessary.

C math ceil - Syntax

mixed ceil(mixed  n);

C math ceil - Parameter and Retun type

`mixed n`	Specifies the real number (int, long, float, double) / infinity (*Required)
`Return mixed`	Returns a number / infinity respective to an input argument.

Example: #1 - C math ceil

Round the floating point number from 1.0 to 2.0 step by 0.1 using ceiling math method and print the resultant in console.

C Input Screen

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

int main(int argc, const char * argv[]) 
{ 
    // Positive floating point value
    printf("The ceiling value of 1.0 is %f \n", ceil(1.0));
    printf("The ceiling value of 1.1 is %f \n", ceil(1.1));
    printf("The ceiling value of 1.2 is %f \n", ceil(1.2));
    printf("The ceiling value of 1.3 is %f \n", ceil(1.3));
    printf("The ceiling value of 1.4 is %f \n", ceil(1.4));
    printf("The ceiling value of 1.5 is %f \n", ceil(1.5));
    printf("The ceiling value of 1.6 is %f \n", ceil(1.6));
    printf("The ceiling value of 1.7 is %f \n", ceil(1.7));
    printf("The ceiling value of 1.8 is %f \n", ceil(1.8));
    printf("The ceiling value of 1.9 is %f \n", ceil(1.9));
    printf("The ceiling value of 2.0 is %f \n", ceil(2.0));
      
    return 0;
}

C Output Screen

The ceiling value of 1.0 is 1.000000

The ceiling value of 1.1 is 2.000000

The ceiling value of 1.2 is 2.000000

The ceiling value of 1.3 is 2.000000

The ceiling value of 1.4 is 2.000000

The ceiling value of 1.5 is 2.000000

The ceiling value of 1.6 is 2.000000

The ceiling value of 1.7 is 2.000000

The ceiling value of 1.8 is 2.000000

The ceiling value of 1.9 is 2.000000

The ceiling value of 2.0 is 2.000000

Example: #2 - C math ceil

Round the positive floating point number (random numbers) using ceiling math method and print the resultant in console.

C Input Screen

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

int main(int argc, const char * argv[]) 
{ 
    // Positive floating point value
    printf("The ceiling value of 1.5698 is %f \n", ceil(1.5698));
    printf("The ceiling value of 1.3093 is %f \n", ceil(1.3093));
    printf("The ceiling value of 1.0087 is %f \n", ceil(1.0087));
    printf("The ceiling value of 1.1038 is %f \n", ceil(1.1038));
    printf("The ceiling value of 1.9573 is %f \n", ceil(1.9573));
    printf("The ceiling value of 1.7462 is %f \n", ceil(1.7462));
    printf("The ceiling value of 1.6427 is %f \n", ceil(1.6427));
    printf("The ceiling value of 1.4128 is %f \n", ceil(1.4128));
    printf("The ceiling value of 1.8099 is %f \n", ceil(1.8099));
    printf("The ceiling value of 1.2743 is %f \n", ceil(1.2743));
    printf("The ceiling value of 2.0001 is %f \n", ceil(2.0001));
      
    return 0;
}

C Output Screen

The ceiling value of 1.5698 is 2.000000

The ceiling value of 1.3093 is 2.000000

The ceiling value of 1.0087 is 2.000000

The ceiling value of 1.1038 is 2.000000

The ceiling value of 1.9573 is 2.000000

The ceiling value of 1.7462 is 2.000000

The ceiling value of 1.6427 is 2.000000

The ceiling value of 1.4128 is 2.000000

The ceiling value of 1.8099 is 2.000000

The ceiling value of 1.2743 is 2.000000

The ceiling value of 2.0001 is 3.000000

Example: #3 - C math ceil

Round the negative floating point number (random numbers) using ceiling math method and print the resultant in console.

C Input Screen

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

int main(int argc, const char * argv[]) 
{ 
    // Negative floating point value
    printf("The ceiling value of -1.5698 is %f \n", ceil(-1.5698));
    printf("The ceiling value of -1.3093 is %f \n", ceil(-1.3093));
    printf("The ceiling value of -1.0087 is %f \n", ceil(-1.0087));
    printf("The ceiling value of -1.1038 is %f \n", ceil(-1.1038));
    printf("The ceiling value of -1.9573 is %f \n", ceil(-1.9573));
    printf("The ceiling value of -1.7462 is %f \n", ceil(-1.7462));
    printf("The ceiling value of -1.6427 is %f \n", ceil(-1.6427));
    printf("The ceiling value of -1.4128 is %f \n", ceil(-1.4128));
    printf("The ceiling value of -1.8099 is %f \n", ceil(-1.8099));
    printf("The ceiling value of -1.2743 is %f \n", ceil(-1.2743));
    printf("The ceiling value of -2.0001 is %f \n", ceil(-2.0001));
      
    return 0;
}

C Output Screen

The ceiling value of -1.5698 is -1.000000

The ceiling value of -1.3093 is -1.000000

The ceiling value of -1.0087 is -1.000000

The ceiling value of -1.1038 is -1.000000

The ceiling value of -1.9573 is -1.000000

The ceiling value of -1.7462 is -1.000000

The ceiling value of -1.6427 is -1.000000

The ceiling value of -1.4128 is -1.000000

The ceiling value of -1.8099 is -1.000000

The ceiling value of -1.2743 is -1.000000

The ceiling value of -2.0001 is -2.000000

Example: #4 - C math ceil

Round the infinity using ceiling math method and print the resultant in console.

C Input Screen

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

int main(int argc, const char * argv[]) 
{ 
    // Positive ∞ infinite value
    printf("The ceiling value of INFINITY  is %f \n", ceil(INFINITY));

    // Negative ∞ infinite value
    printf("The ceiling value of INFINITY  is %f \n", ceil(-INFINITY));
}

C Output Screen

The ceiling value of Infinity is 1.#INF00

The ceiling value of -Infinity is -1.#INF00

Related Tags:

c
c math funtions
ceil
ceiling value
math ceil
next highest integer
positive floating point
negative floating point
infinity
-infinity

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