CSE202-Lec#4. CSE202 C++ Programming
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1 CSE202-Lec#4 Functions and input/output CSE202 C++ Programming
2 Outline Creating User Defined Functions Functions With Default Arguments Inline CSE202 C++ Programming
3 What is function???? Function is a self contained block of statements that perform a coherent task of some kind. Every C++ program can be a thought of the collection of functions. main()isalsoafunction.
4 Types of Functions. Library functions Thesearethein--builtfunctionsof C++ library. These are already defined in header files. User defined functions. Programmer can create their own function in C++ to perform specific task
5 Why use function? Writing functions avoids rewriting of the same codeagainandagainintheprogram. Using function large programs can be reduced to smaller ones. It is easy to debug and find outtheerrorsinit. Using a function it becomes easier to write programtokeeptrackofwhattheyaredoing.
6 //Function Declaration retn_type func_name(data_type 1,data_type par2); //Function Defination rent_type func_name(data_typepar1,data_type par2) // body of the function //Function Call func_name(par1,par2);
7 Function prototype A prototype statement helps the compiler to check the return type and arguments type of the function. A prototype function consist of the functions return type, name and argument list. Example intsum(int x,int y);
8 Example #include<iostream.h> #include<conio.h> void main() clrscr(); void sum(int, int); // function declaration int a, b, c; cout<< enter the two no ; cin>>a>>b; sum(a,b); // function calling getch(); void sum( int x, int y) // function definition c=x+y; cout<< sum is <<c;
9 #include<conio.h> void main() clrscr(); int a=10,b=20; int sum(int, int); int c=sum(a,b); Cout<< sum is << c; getch(); int sum(int x, int y) int s; s=x+y; return(s); /*actual arguments /*return value /*formal arguments
10 Categories of functions A function with no parameter and no return value A function with parameter and no return value A function with parameter and return value A function without parameter and return value
11 A function with no parameter and no return value #include<conio.h> void main() clrscr(); void print(); /*func declaration Cout<< no parameter and no return value ; print(); /*func calling getch(); void print() /*func defination For(int i=1;i<=30;i++) cout<< * ; Cout<< \n ;
12 A function with no parameter and no return value There is no data transfer between calling and called function The function is only executed and nothing is obtained Such functions may be used to print some messages, draw stars etc
13 A function with parameter and no return value #include<conio.h> void main() clrscr(); int a=10,b=20; void mul(int,int); mul(a,b); getch(); void mul(int x, int y) int s; s=x*y; Cout<< mul is << s; /*actual arguments /*formal arguments
14 A function with parameter and return value #include<conio.h> void main() clrscr(); int a=10,b=20,c; int max(int,int); c=max(a,b); Cout<< greatest no is <<c; getch(); int max(int x, int y) if(x>y) return(x); else return(y);
15 A function without parameter and return value #include<conio.h> void main() clrscr(); int a=10,b=20; int sum(); int c=sum(); /*actual arguments Cout<< sum is << c; getch(); int sum() /*formal arguments int x=10,y=20; return(x+y); /*return value
16 Default arguments In the function prototype (declaration), the default values are given. Whenever a call is made to function without specifying an argument, the program will automatically assign values to the parameters from the default function prototype. Default arguments facilitate easy development and maintenance of programs.
17 #include<iostream.h> void sum(int x=10, int y=20); void main() sum(); void sum(int a1,int a2) Int temp; temp= a1+a2; Cout<< Sum is <<temp;
18 Inline functions One of the objectives of using functions is to save some memory space, which becomes appreciable when a function is likely to be called many times. Everytimeafunctioniscalled,ittakesalotof extra time in executing a series of instructions. Toeliminatethecostofcallstosmallfunctions, C++ proposes inline function.
19 An inline function is a function that expanded in line when it is invoked. The compiler replaces the function call with corresponding function code. inline function header function body
20 Prefix the keyword inlineto the function definition. #include<iostream.h> inline float mul(float x, float y) return(x*y); Inline double div(double p, double q) return(p/q); void main() float a = ; float b = 9.82 cout<< mul(a,b) << \n ; cout<<div( a,b)<< \n
21 Situation where inline expansion do not work For functions returning values, if loop, a switch or a gotoexists. If function contain static variable. If inline functions are recursive
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