Compilare: user.c: In function ‘main’: user.c:16:5: warning: implicit declaration of function ‘strdup’ [-Wimplicit-function-declaration] JSON1 = strdup(JSON) ; ^ user.c:16:11: warning: assignment makes pointer from integer without a cast [enabled by default] JSON1 = strdup(JSON) ; ^ user.c:15:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%[^\t]s",JSON); ^ user.c:49:3: warning: ‘j2’ may be used uninitialized in this function [-Wmaybe-uninitialized] for ( j = j1 ; j <= j2 ; j++ ) { ^ user.c:28:11: warning: ‘j1’ may be used uninitialized in this function [-Wmaybe-uninitialized] for ( j = j1 + 1 ; j < j2 ; j++ ) { ^