Compilare: user.c: In function ‘add’: user.c:25:5: warning: implicit declaration of function ‘calloc’ [-Wimplicit-function-declaration] nou=(PNOD)calloc(1,sizeof(PNOD)); ^ user.c:25:15: warning: incompatible implicit declaration of built-in function ‘calloc’ [enabled by default] nou=(PNOD)calloc(1,sizeof(PNOD)); ^ user.c: In function ‘citire’: user.c:42:14: warning: incompatible implicit declaration of built-in function ‘calloc’ [enabled by default] L=(PNOD*)calloc(n+1,sizeof(PNOD)); ^ user.c: In function ‘push’: user.c:75:9: warning: incompatible implicit declaration of built-in function ‘calloc’ [enabled by default] nou=calloc(1,sizeof(PNOD)); ^ user.c: In function ‘Sortare_Topologica’: user.c:104:20: warning: incompatible implicit declaration of built-in function ‘calloc’ [enabled by default] culoare= (int*)calloc(n+1,sizeof(int)); ^ user.c: In function ‘citire’: user.c:37:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("sortaret.in","r",stdin); ^ user.c:39:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.c:47:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&v1,&v2); ^ user.c: In function ‘afisare’: user.c:121:13: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("sortaret.out","w",stdout); ^