The programs that work in c and c++ are described how and why in detail

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Programs that work in C and not in C++
1.
int main()
{
int a = fun();
return 0;
}
int fun()
{
return 2;
}
As the function prototype is not declared before the function is called, it
gives an error in C++. But in C, it works fine.
2.
int main()
{
const int a;
return 0;
}
In C++, the const integer should be initialized at the time of declaration only.
3.
int main()
{ int c;
void *b=&c;
*((int*)b)=10;
printf("%d",*((int*)b));
return 0;
}

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Here the void pointer points to an integer. For typecasting to int pointer,
we need not to use explicit type cast as we do in C++. In C, type casting is done
through implicit typecast.
4.
int main()
{
int const a=10;
int *p=&a;
return 0;
}
In C++, only the const pointer can point to the const integers. In C, either
const or non-const pointers can point to that object.
5.
int main()
{
int new =10;
printf("%d",new);
return 0;
}
In C++, new, delete, explicit are Reserved words. As reserved words cannot
be used as variables in C++.
6.
int main()
{
char *p=333;
printf("%u",p);
return 0;
}
In C++, char pointer can’t point to an integer variable.