How Do I Pass Back Return Values From the Function Matlab

C function argument and return values

Prerequisite : Functions in C/C++

A function in C can be called either with arguments or without arguments. These function may or may not return values to the calling functions. All C functions can be called either with arguments or without arguments in a C program. Also, they may or may not return any values. Hence the function prototype of a function in C is as below:

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There are following categories:

1. Function with no argument and no return value : When a function has no arguments, it does not receive any data from the calling function. Similarly when it does not return a value, the calling function does not receive any data from the called function.
   Syntax :

                   Function declaration :                void function();                Function call :                function();                Function definition :                void function()                       {                         statements;                       }              

   #include <stdio.h>

   void value( void );

   void main()

   {

   value();

   }

   void value( void )

   {

   int year = 1, period = 5, amount = 5000, inrate = 0.12;

   float sum;

   sum = amount;

   while (year <= period) {

   sum = sum * (1 + inrate);

   year = year + 1;

   }

   printf ( " The total amount is %f:" , sum);

   }

   Output:

   The total amount is 5000.000000              

2. Function with arguments but no return value : When a function has arguments, it receive any data from the calling function but it returns no values.

   Syntax :

                   Function declaration :                void function ( int );                Function call :                function( x );                Function definition:                void function( int x )              {                statements;              }              

   #include <stdio.h>

   void function( int , int [], char []);

   int main()

   {

   int a = 20;

   int ar[5] = { 10, 20, 30, 40, 50 };

   char str[30] = "geeksforgeeks" ;

   function(a, &ar[0], &str[0]);

   return 0;

   }

   void function( int a, int * ar, char * str)

   {

   int i;

   printf ( "value of a is %d\n\n" , a);

   for (i = 0; i < 5; i++) {

   printf ( "value of ar[%d] is %d\n" , i, ar[i]);

   }

   printf ( "\nvalue of str is %s\n" , str);

   }

   Output:

   value of a is 20 value of ar[0] is 10 value of ar[1] is 20 value of ar[2] is 30 value of ar[3] is 40 value of ar[4] is 50 The given string is : geeksforgeeks              

3. Function with no arguments but returns a value : There could be occasions where we may need to design functions that may not take any arguments but returns a value to the calling function. A example for this is getchar function it has no parameters but it returns an integer an integer type data that represents a character.
   Syntax :

                   Function declaration :                int function();                Function call :                function();                Function definition :                int function()                  {                      statements;                       return x;                   }              

   #include <math.h>

   #include <stdio.h>

   int sum();

   int main()

   {

   int num;

   num = sum();

   printf ( "\nSum of two given values = %d" , num);

   return 0;

   }

   int sum()

   {

   int a = 50, b = 80, sum;

   sum = sqrt (a) + sqrt (b);

   return sum;

   }

   Output:

   Sum of two given values = 16              

4. Function with arguments and return value
   Syntax :

                   Function declaration :                int function ( int );                Function call :                function( x );                Function definition:                int function( int x )              {                statements;                return x;              }              

   #include <stdio.h>

   #include <string.h>

   int function( int , int []);

   int main()

   {

   int i, a = 20;

   int arr[5] = { 10, 20, 30, 40, 50 };

   a = function(a, &arr[0]);

   printf ( "value of a is %d\n" , a);

   for (i = 0; i < 5; i++) {

   printf ( "value of arr[%d] is %d\n" , i, arr[i]);

   }

   return 0;

   }

   int function( int a, int * arr)

   {

   int i;

   a = a + 20;

   arr[0] = arr[0] + 50;

   arr[1] = arr[1] + 50;

   arr[2] = arr[2] + 50;

   arr[3] = arr[3] + 50;

   arr[4] = arr[4] + 50;

   return a;

   }

   Output:

   value of a is 40 value of arr[0] is 60 value of arr[1] is 70 value of arr[2] is 80 value of arr[3] is 90 value of arr[4] is 100              

   
   

How Do I Pass Back Return Values From the Function Matlab

Source: https://www.geeksforgeeks.org/c-function-argument-return-values/

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