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++.



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;


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++


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++


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


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++


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);


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.


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

void main()
int abc = func(5);

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

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

goto yourLabel:
int ab =5;

printf(“%d”, ab);

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About Kapil Thakar

"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."
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