Built in function

Built in function

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  WELCOME TO YOUR PRESENTATION TopicName : Built in Function
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  PRESENTED BY GroupMember ID TaniaAkter 0111-61-035 MD. Rayhanul Islam 0111-61-036 Saddam Hossain 0111-61-037
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  FUNCTION :  Afunction is a group of statements that together perform a task.  A function is a block of code that performs a calculation and returns a value.  Every C program has at least one function, which is main()
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  CLASSIFICATION OF FUNCTION: User define function Library function or Built-in function Function
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  WHAT IS LIBRARYFUNCTION OR BUILT-IN FUNCTION??  Built in functions are the functions that are provided by C library.  These functions perform file access, mathematical computations, graphics, memory management etc.  Defined in a special header file.  A function that is built into an application and can be accessed by end-users.
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  BUILT-IN FUCTION HEADERFILES: <stdio.h> : Standard input/output. <conio.h> : This is console input/output header file. <string.h> : All string related functions are defined in this header file. <math.h> : All maths related functions are defined in this header file <time.h> : Time and clock related functions
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  <STDIO.H> LIBRARY FUNCTIONSSOURCE CODE : printf() : This function is used to print the character, string, float, integer, octal and hexadecimal values onto the output screen. scanf() : This function is used to read a character, string, numeric data from keyboard. getc() : It reads character from file gets() : It reads line from keyboard getchar() : It reads character from keyboard putchar() : It writes a character to screen
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  getw() : readsan integer from file putw() : writes an integer to file fgetc() : reads a character from file putc() : writes a character to file feof() : finds end of file fprintf() : writes formatted data to a file fscanf(): reads formatted data from a file fgetchar : reads a character from keyboard Fputchar : writes a character from keyboard
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  <CONIO.H> LBRARY FUNCTIONSSOURCE CODE : clrscr() : This function is used to clear the output screen. getch() : It reads character from keyboard textcolor() : This function is used to change the text color textbackground() : This function is used to change text background
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  <STRING.H> LIBRARY FUNCTIONSSOURCE CODE: strcat(str1, str2) : Concatenates str2 at the end of str1. strcpy(str1, str2) : Copies str2 into str1 strlen(strl) : gives the length of str1. strcmp(str1, str2) : Returns 0 if str1 is same as str2. Returns <0 if strl < str2. Returns >0 if str1 > str2. strdup() : duplicates the string strlwr() : converts string to lowercase
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  <MATH.H> LIBRARY FUNCTIONSSOURCE CODE : sin( ) : This function is used to calculate sine value. cos( ) : This function is used to calculate cosine. tan( ) : This function is used to calculate tangent. log( ) : This function is used to calculates natural logarithm. pow( ) : This is used to find the power of the given number.
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  <TIME.H> LIBRARY FUNCTIONSSOURCE CODE : setdate() : This function used to modify the system date getdate() : This function is used to get the CPU time clock() : This function is used to get current system time time() : This function is used to get current system time as structure difftime() : This function is used to get the difference between two given times
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  ADVANTAGES :  Ithelps in making the code very simple and much more easier to handle.  A function may be used by many other programs.  You can use it over and over without retyping the code  Less code for more  Helps organize your code
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  DISADVANTAGES:  I thinkfunctions are sometimes difficult to handle and can confuse the programmer in handling different tasks.
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  PROGRAMING IN BUILT-INFUNCTION : #include<stdio.h> main() { printf ("Welcome To Your Presentation"); } Sample Output :
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  THANK YOU