Write a program that compile in C not in C++

To get this answer, we just need to think about the difference in C & C++.

Examples:

1)

There is automatic implicit type conversion in C which is not available in C++.

void *vptr;

int *iPTR = vptr; //allowed in C, not in C++

To compile in C++:

void *vptr;

int *iPTR = static_cast<int*> vptr;

2)

There is automatic implicit type conversion in C which is not available in C++.

int temp = malloc (10); //allowed in C, not in C++

int temp = malloc (sizeof (int) * 10); //allowed in C, not in C++

To Compile in C++:

int temp = static_cast<int*> malloc (10);

int temp = static_cast<int*> malloc (sizeof (int) * 10);

There are many additional keywords available in C++ which is not available in C.

int new; //Compile in C not in C++ as new is keyword in C++

int class; //keyword in c++

3)

Function without argument is considered as arguments are not provided and it is legal to call the function with arguments. While C++ it is considered no argument and not legal to call the function with error.

int foo()

void main()

{

foo(2,3); //error in C++

}

4)

sizeof(‘ch’) is equal to sizeof(int) in C

sizeof(‘ch”) is equal to sizeof(char) in C++

5)

It is required to initialize the const variable while declaring it in C++ but not necessary in C.

const int a; //through error in C++

6)

Variable length array is not allowed in C++ while allowed in C.

int a = func(2);

int b[a];

To handle the same thing in C++ you need to use vector.

vector<int> b(a);

7) 

Assignment of const integer pointer to integer pointer is not allowed without type casting in C++ but allowed in c.

const int x = 12;

int* a = &x;

Some of the c compiler generate warnings.

8) 

Function without return type is considered as integer return type by default in C but not in C++.

func(int);

void main()

{

int abc = func(5);

}

This works well with C but not with C++.

9)

You cannot skip or cross the definition using goto or switch statement in C++ while possible in C.

goto yourLabel:

int ab =5;

yourLabel:

printf(“%d”, ab);

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"I am Kapil Thakar, an Embedded Engineer cum Blogger wants to learn new things. I love to share my knowledge solutions to the problems. Interested in Blogging, Creative-Writing, SEO, Website Creation, Video Making, Editing, Affiliation Programs, Online Making Money."