As per the chapter, which of the following is not true about the development of mymagic+?

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Prerequisite: Functions in C/C++ A function in C can be called either with arguments or without arguments. These functions 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: |

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;
                      }

C

#include <stdio.h>

void value(void);

void main()

{

    value();

}

void value(void)

{

    float 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 8811.708984:

1. Function with arguments but no return value: When a function has arguments, it receives 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;
             }

C

#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

value of str is geeksforgeeks

1. 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. An example of this is getchar function it has no parameters but it returns an integer and integer type data that represents a character. Syntax :

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

C

#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

1. 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;
             }

C

#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