int main()
      {
       int a = 3;
       int b = 7;
       int c = 0;

       printf("a=%d | b=%d |c=%d\n", a, b, c );

       c = a*b;
       printf("a=%d | b=%d |c=%d\n", a, b, c );
       // c est maintenant egal a 21 ( 3*7 )
       a = c*2;
       printf("a=%d | b=%d |c=%d\n", a, b, c );
       // a est maintenant egal a 42 ( 21*2 )
       b= 3*4;
       printf("a=%d | b=%d |c=%d\n", a, b, c );
       // b est maintenant egal a 12
       return(1);
      }