voici le code  
 
il fonctionne avec borlanc c++
 
#include<iostream.h>
#include<math.h>
 
int a;
int b;
int c;
float delta;
 
int main()
{
 
 cout<<"calcul de racines d'equations du 2nd degre : aX^2+bX+c = 0\n";
 cout<<"entrez a\n";
 cin>>a;
 cout<<"entrez b\n";
 cin>>b;
 cout<<"entrez c\n";
 cin>>c;
 delta = b*b-4*a*c;
 if (delta>0) {  
    cout<<"2 racines\n";
    cout<<"premiere racine: "<<(-b-sqrt(delta))/2<<"\n";
    cout<<"deuxieme racine: "<<(-b+sqrt(delta))/2<<"\n";
   }
   
 else if (delta == 0) { cout<<"racines double: "<< -b/2;}  
 else  { cout<<"pas de raciens reelles";}
 
}
 
 
lorsque je fais gcc racines, j'ai les erreurs suivantes
 
 
linuxhome/marc # gcc racines.cpp
/tmp/ccqZp2dW.o: In function `main':
/tmp/ccqZp2dW.o(.text+0xf): undefined reference to `cout'
/tmp/ccqZp2dW.o(.text+0x14): undefined reference to `ostream::operator<<(char const *)'
/tmp/ccqZp2dW.o(.text+0x24): undefined reference to `cout'
/tmp/ccqZp2dW.o(.text+0x29): undefined reference to `ostream::operator<<(char const *)'
/tmp/ccqZp2dW.o(.text+0x39): undefined reference to `cin'
/tmp/ccqZp2dW.o(.text+0x3e): undefined reference to `istream::operator>>(int &)'
/tmp/ccqZp2dW.o(.text+0x4e): undefined reference to `cout'
/tmp/ccqZp2dW.o(.text+0x53): undefined reference to `ostream::operator<<(char const *)'
/tmp/ccqZp2dW.o(.text+0x63): undefined reference to `cin'
/tmp/ccqZp2dW.o(.text+0x68): undefined reference to `istream::operator>>(int &)'
/tmp/ccqZp2dW.o(.text+0x78): undefined reference to `cout'
/tmp/ccqZp2dW.o(.text+0x7d): undefined reference to `ostream::operator<<(char const *)'
/tmp/ccqZp2dW.o(.text+0x8d): undefined reference to `cin'
/tmp/ccqZp2dW.o(.text+0x92): undefined reference to `istream::operator>>(int &)'
/tmp/ccqZp2dW.o(.text+0xec): undefined reference to `cout'
/tmp/ccqZp2dW.o(.text+0xf1): undefined reference to `ostream::operator<<(char const *)'
/tmp/ccqZp2dW.o(.text+0x123): undefined reference to `sqrt'
/tmp/ccqZp2dW.o(.text+0x146): undefined reference to `cout'
/tmp/ccqZp2dW.o(.text+0x14b): undefined reference to `ostream::operator<<(char const *)'
/tmp/ccqZp2dW.o(.text+0x156): undefined reference to `ostream::operator<<(double)'
/tmp/ccqZp2dW.o(.text+0x161): undefined reference to `ostream::operator<<(char const *)'
/tmp/ccqZp2dW.o(.text+0x193): undefined reference to `sqrt'
/tmp/ccqZp2dW.o(.text+0x1b6): undefined reference to `cout'
/tmp/ccqZp2dW.o(.text+0x1bb): undefined reference to `ostream::operator<<(char const *)'
/tmp/ccqZp2dW.o(.text+0x1c6): undefined reference to `ostream::operator<<(double)'
/tmp/ccqZp2dW.o(.text+0x1d1): undefined reference to `ostream::operator<<(char const *)'
/tmp/ccqZp2dW.o(.text+0x215): undefined reference to `cout'
/tmp/ccqZp2dW.o(.text+0x21a): undefined reference to `ostream::operator<<(char const *)'
/tmp/ccqZp2dW.o(.text+0x225): undefined reference to `ostream::operator<<(int)'
/tmp/ccqZp2dW.o(.text+0x239): undefined reference to `cout'
/tmp/ccqZp2dW.o(.text+0x23e): undefined reference to `ostream::operator<<(char const *)'
collect2: ld returned 1 exit status
linuxhome/marc #

Il faut pas un espace entre #include et <truc.h> ?

Il faut compiler avec -lstdc++

 
non, ca change rien ça
 
ca semble plutôt qu'il trouve pas la librairie...

c'est en effet très bizarre, car il se plaint pas de pas trouver les  include....

Il faut compiller avec g++ et pas avec gcc. C'est plus propre que la version de kadreg
 
gcc => C
g++ => C++

Kristoph a écrit a écrit : Il faut compiller avec g++ et pas avec gcc. C'est plus propre que la version de kadreg   gcc => C g++ => C++

 
 

 
c'était tellement gros qu'on l'avait même pas vu !!!!!!!!!!!!!!!!!!!!!!*
 
 
 
terrrible !!!!!!!!!!!!!!!!!!!!!!!
 
 
 

Obsolete

 
Standard