C++ LANGUAGE CALLING A FUNCTION PAGE 70

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C++ LANGUAGE CALLING A FUNCTION

Calling a Function 


While creating a C++ function, you give a definition of 
what the function has to do. To use a function, you will 
have to call or invoke that function. 

When a program calls a function, program control is 
transferred to the called function. A called function 
performs defined task and when it’s return statement is 
executed or when its function-ending closing brace is 
reached, it returns program control back to the main program. 

To call a function, you simply need to pass the required 
parameters along with function name, and if function returns 
a value, then you can store returned value. For example: 

#include <iostream> 

using namespace std; 
  
// function declaration 
int max(int num1, int num2); 
  
int main () 
{ 
   // local variable declaration: 
   int a = 100; 
   int b = 200; 
   int ret; 
  
   // calling a function to get max value. 
   ret = max(a, b); 
  
   cout << "Max value is : " << ret << endl; 
  
   return 0; 
} 
  
// function returning the max between two numbers 

int max(int num1, int num2)  
{ 
   // local variable declaration 
   int result; 
  
   if (num1 > num2) 
      result = num1; 
   else 
      result = num2; 
  
   return result;  
} 
I kept max() function along with main() function and compiled 
the source code. While running final executable, it would produce 
the following result: 
Max value is : 200