Re: Clang vs GCC

Test avec g++ 4.6.3

#include <iostream>
int main() {
 float x = 1.0;
 x *= 0,75;
 std::cout << x << std::endl;
}

$ g++ -o virgule virgule.cpp && ./virgule
0
$ g++ -Wall -o virgule virgule.cpp && ./virgule
virgule.cpp: In function ‘int main()’:
virgule.cpp:4:12: attention : right operand of comma operator has no effect [-Wunused-value]
0
$ g++ -Wunused-value -o virgule virgule.cpp && ./virgule 
virgule.cpp: In function ‘int main()’:
virgule.cpp:4:12: attention : right operand of comma operator has no effect [-Wunused-value]
0

Remplaçons la ligne par :

 x *= 0,x=75;

$ g++ -Wall -o virgule virgule.cpp && ./virgule
75

Et c'est aussi valable en C :

#include "stdio.h"
int main() {
 float x = 1.0;
 x *= 0,x=75;
 printf("%f\n",x);
}

$ gcc -Wall -o virgule virgule.cpp && ./virgule
75.000000