Error(s):

source_file.c: In function ‘main’:
source_file.c:24:8: warning: missing terminating " character
 printf("Quel est le
        ^
source_file.c:24:1: error: missing terminating " character
 printf("Quel est le
 ^
source_file.c:25:1: error: ‘nombre’ undeclared (first use in this function)
 nombre ? ");
 ^
source_file.c:25:1: note: each undeclared identifier is reported only once for each function it appears in
source_file.c:25:10: warning: missing terminating " character
 nombre ? ");
          ^
source_file.c:25:1: error: missing terminating " character
 nombre ? ");
 ^
source_file.c:27:14: error: expected ‘:’ before ‘;’ token
 &nombreEntre);
              ^
source_file.c:37:8: warning: missing terminating " character
 printf("C'est
        ^
source_file.c:37:1: error: missing terminating " character
 printf("C'est
 ^
source_file.c:38:1: error: stray ‘\’ in program
 plus !\n\n");
 ^
source_file.c:38:1: error: stray ‘\’ in program
source_file.c:38:11: warning: missing terminating " character
 plus !\n\n");
           ^
source_file.c:38:1: error: missing terminating " character
 plus !\n\n");
 ^
source_file.c:41:8: warning: missing terminating " character
 printf("C'est
        ^
source_file.c:41:1: error: missing terminating " character
 printf("C'est
 ^
source_file.c:42:1: error: stray ‘\’ in program
 moins !\n\n");
 ^
source_file.c:42:1: error: stray ‘\’ in program
source_file.c:42:12: warning: missing terminating " character
 moins !\n\n");
            ^
source_file.c:42:1: error: missing terminating " character
 moins !\n\n");
 ^
source_file.c:44:9: warning: missing terminating " character
 printf ("Bravo,
         ^
source_file.c:44:1: error: missing terminating " character
 printf ("Bravo,
 ^
source_file.c:46:1: error: stray ‘\’ in program
 mystere !!! \n\n");
 ^
source_file.c:46:1: error: stray ‘\’ in program
source_file.c:46:17: warning: missing terminating " character
 mystere !!! \n\n");
                 ^
source_file.c:46:1: error: missing terminating " character
 mystere !!! \n\n");
 ^
source_file.c:50:1: error: expected declaration or statement at end of input
 }
 ^
source_file.c:10:5: warning: variable ‘nombreMystere’ set but not used [-Wunused-but-set-variable]
 int nombreMystere = 0,
     ^