Computing Fundamental
Lab-07
ThegeneralformofafunctiondefinitioninC++isasfollows:
return type function-name ( parameter-list )
{
local variable-definitions;
function-implementation;
return value;
}
Parts of functions.
1- Type of the value that the function will return
2- Name of the function
3- Zero or more variables that becomes the input to the
functions
4- Body of the function, contains the code which is
executed when the function is called
5- The values that function wants to return
Key Note: When a function don’t want to return a value, it
tells the compiler by means of void,
There can be following forms of a functions
A. Function with no return values and no arguments
B. Functions with arguments with no return value
C. Functions with return value with no arguments
D. Functions with return value and arguments
Example A:
void DisplayMyName(void){
cout<<”My Name is Ahmed”<<endl;
}
Key Note: void in the function means that function will not
return any value
Example B:
void EvenOrOdd(int num){
if(num%2==0)
cout<<”Even”<endl;
else
cout<<”Odd”<<endl;
}
Example C:
float DollaRate(void){
return 85.6;
}
Exmaple D:
int makeEven(int x){
int result;
if(x%2==0)
result=x;
else
result=x+1;
return result;
}
Declaring and Using a function
A function should be declared before main(), one way is to
declare and define the function before main, other way is to
declare the function before main and define it after main
Example(Method 1):
#include<stdio.h>
#include<conio.h>
#include<iostream.h>
int add(int x,int y){
int result;
result=x+y;
return result;
}
main(){
clrscr();
int a;
a=add(10,20);
cout<<”Sum of 10 and 20 is”<<a<<endl;
}
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