- C is
not
an Object-Oriented Programming Language
Consequently:
- Functions in
C are
uniquely identified
by their
function name
only !!!!
I.e.:
- The parameters are not taken into consideration to identify a function in C
- Functions in
C are
uniquely identified
by their
function name
only !!!!
- Example:
#include <stdio.h> /* ------------------------------- Definition of function f ------------------------------- */ int f( int x) // definition 1 { return(x * x ); } /* ------------------------------------------ Duplicate definition of function f !!! ------------------------------------------ */ float f( float x) // definition 2 { return(x * x ); } int main(int argc, char *argv[] ) { }will result in compile error:
cs255-1@aruba (4822)> gcc overload1.c overload1.c:16:7: error: conflicting types for f float f( float x) // definition 2 ^ overload1.c:7:5: note: previous definition of f was here int f( int x) // definition 1 ^
- Example Program:
(Demo above code)
- Prog file: /home/cs255001/demo/C/set1/overload1.c
How to run the program:
- To compile: gcc overload1.c
- To run: won't compile, can't run it !!
- In contrast,
Java has
overloaded functions:
public class overload1 { /* ------------------------------- Definition of function f ------------------------------- */ public static int f( int x) // definition 1 { return(x * x ); } /* ------------------------------------------ Overloaded definition of function f !!! ------------------------------------------ */ public static float f( float x) // definition 2 { return(x * x ); } public static void main(String[] argv) { } }No errors when you compile this Java program !!!
- Example Program:
(Demo above code)
- Prog file: /home/cs255001/demo/C/set1/overload1.java
How to run the program:
- To compile: javac overload1.java