**Addition Subtraction Multiplication**

**Addition Subtraction Multiplication**

Write a C++ Program for Addition Subtraction Multiplication using function. Here’s simple C++ Program for Addition Subtraction Multiplication using function in C++ Programming Language.

*What are Functions ?*

*What are Functions ?*

Function is a block of statements that performs some operations. All C++ programs have at least one function – function called “main()”. This function is entry-point of your program.

A function **declaration** tells the compiler about a function’s name, return type, and parameters. A function **definition** provides the actual body of the function.

**Defining a Function : :**

**Defining a Function : :**

The general form of a C++ function definition is as follows:

return_type Function_Name( list of parameters )

{

//function’s body

}

**return_type :**suggests what the function will return. It can be void, int, char, some pointer or even a class object.**Function_Name :**is the name of the function, using the function name it is called.**Parameters :**are variables to hold values of arguments passed while function is called. A function may or may not contain parameter list.**Function body :**is he part where the code statements are written.

Below is the source code for C++ Program for Addition Subtraction Multiplication using function which is successfully compiled and run on Windows System to produce desired output as shown below :

**SOURCE CODE : :**

**SOURCE CODE : :**

/* C++ Program for Addition Subtraction Multiplication using function */ #include<iostream> using namespace std; int sum(int,int); int sub(int,int); int mul(int,int); int res=0; int main() { int a,b,m,su,s; cout<<"\nEnter 1st number :: "; cin>>a; cout<<"\nEnter 2nd number :: "; cin>>b; s=sum(a,b); su=sub(a,b); m=mul(a,b); cout<<"\nAddition of two Numbers [ "<<a<<" + "<<b<<" ] = "<<s<<"\n"; cout<<"\nSubtraction of two Numbers [ "<<a<<" - "<<b<<" ] = "<<su<<"\n"; cout<<"\nMultiplication of two Numbers [ "<<a<<" * "<<b<<" ] = "<<m<<"\n"; return 0; } sum(int a,int b) { res=a+b; return(res); } sub(int a,int b) { res=a-b; return(res); } mul(int a,int b) { res=a*b; return(res); }

**OUTPUT : :**

**OUTPUT : :**

/* C++ Program for Addition Subtraction Multiplication using function */ Enter 1st number :: 7 Enter 2nd number :: 3 Addition of two Numbers [ 7 + 3 ] = 10 Subtraction of two Numbers [ 7 - 3 ] = 4 Multiplication of two Numbers [ 7 * 3 ] = 21 Process returned 0

Above is the source code for C++ Program for Addition Subtraction Multiplication using function which is successfully compiled and run on Windows System.The Output of the program is shown above .

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This was the g++ compiler response:

CodezMathFuncs.cpp:31:16: error: ISO C++ forbids declaration of ‘sum’ with no type [-fpermissive]

sum(int a,int b)

^

CodezMathFuncs.cpp:37:16: error: ISO C++ forbids declaration of ‘sub’ with no type [-fpermissive]

sub(int a,int b)

^

CodezMathFuncs.cpp:43:16: error: ISO C++ forbids declaration of ‘mul’ with no type [-fpermissive]

mul(int a,int b)

^

..,didn’t work on my Linux Mint.

Please correct this error