Library
function:
- C language provides built-in functions called library function.
- The C standard library consists of wide verity of header files which can be included into a programmer’s project with a single directive.
- Each header file contains one or more function declarations, data type definition, and macros.
- The following library functions are,
1.
sqrt(x):
This function evaluates the square root of ‘x’. Note
that the argument must be non-negative.
Example:
sqrt(25)
Here the square root of 25 evaluated as 5.
2.
log(x):
Where the argument ‘x’ must be real. Here loge x is
evaluated.
Example:
log(7.5-x*y) this evaluate loge(7.5-xy)
3.
exp(x):
This function evaluates ex. The argument
must be of real quantity.
Example: exp(7.5) this evaluate e7.5
4.
pow(a,b):
Where the arguments ‘a’ and ‘b’ are maybe integer
or float values.
This evaluates the value of ab.
Example: pow(4,2) this evaluate (4)2.
5.
ceil(x):
It is used to rounding x to the next integer value.
Example.
Ceil(5.6) evaluates 6
6.
fmod(x,y):
It reterurn the remainder of x/y.
Example: fmod(7,3) evaluates 1, because, when 7 is
divided by 3 the remainder is 1.
7.
sin(x):
This evaluates the trigonometric sine value.
Example: sin(30) evaluate 0.5
8.
cos(x):
This evaluates the trigonometric cosine value.
Example: cos(30) evaluate 0.75
9.
tan(x):
This evaluate the trigonometric tangent(
)value.
Example: tan(30) evaluate 0.577
10.
toascii(x):
Returns the integer value for the articular
character.
Example: toascii(a) evaluates
97
11.
tolower(x):
It is used to convert the character capital letter
into a small letter.
Example: tolower(‘Z’) evaluates z
12.
toupper(x):
It is used to convert the character small letter into
capital letter.
Example: toupper(‘z’) evaluates Z.
13.
ctime(t):
It is used to show the current time in your system.
Using #include<time.h> header file and time_t
datatype.
Example program for library function:
#include<stdio.h>
#include<stdio.h>
#include<conio.h>
#include<math.h>//all mathematic calculations
#include<ctype.h>//to find ascii value
#include<time.h>//To display time
void main()
{
time_t
t; //time data type
time(&t);//calling current time
clrscr();
printf(" The current
date and time is : %s\n",ctime(&t));
printf(" The
sequre root of 25 value is : %lf\n",sqrt(25));
printf(" The
log(5.6) value is : %lf\n",log(5.6));
printf(" The
exp(12.0) value is : %lf\n",exp(12.0));
printf(" The power
4 of 2 is : %lf \n",pow(4,2));
printf(" The round
of 5.6 value is : %lf \n",ceil(5.6));
printf(" The
modulo of 7/3 value is :%lf \n",fmod(7,3));
printf(" sin(90)
value is : %lf\n", sin(90));
printf(" cos(90)
value is : %lf\n", cos(90));
printf(" tan(45)
value is : %lf\n", tan(45));
printf(" The ASCII
chacter w value is : %d \n", toascii('w'));
printf(" The lower
value of chacter H is : %c\n",tolower('H'));
printf(" The upper
value of chacter e is : %c\n",toupper('e'));
getch();
}
Output:
No comments:
Post a Comment