Function overloading and return type

In C++ and Java, functions can not be overloaded if they differ only in the return type.

For example, the following program C++ and Java programs fail in compilation.

C++ Program

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#include<iostream>
int foo() { 
    return 10; 
}
  
char foo() {  // compiler error; new declaration of foo()
    return 'a'
}
  
int main()
{
    char x = foo();
    getchar();
    return 0;
}
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Java Program

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// filename Main.java
public class Main {
    public int foo() {
        return 10;
    }
    public char foo() { // compiler error: foo() is already defined
        return 'a';
    }
    public static void main(String args[])
    
    }
}
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