Write a program that compiles and runs both in C and C++, but produces different results when compiled by C and C++ compilers.
There can be many such programs, following are some of them.
1) Character literals are treated differently in C and C++. In C character literals like 'a', 'b', ..etc are treated as integers, while as characters in C++. (See
this for details)
For example, the following program produces sizeof(int) as output in C, but sizeof(char) in C++.
2) In C, we need to use struct tag whenever we declare a struct variable. In C++, the struct tag is not necessary. For example, let there be a structure for
Student. In C, we must use '
struct Student' for
Student variables. In C++, we can omit struct and use '
Student' only.
Following is a program that is based on the fact and produces different outputs in C and C++. It prints sizeof(int) in C and sizeof(struct T) in C++.
3) Types of boolean results are different in C and C++. Thanks to Gaurav Jain for suggesting this point.
