Compilare: user.c: In function ‘main’: user.c:14:2: warning: implicit declaration of function ‘strdup’ [-Wimplicit-function-declaration] p=strdup(c); ^ user.c:14:3: warning: assignment makes pointer from integer without a cast [enabled by default] p=strdup(c); ^ user.c:44:3: warning: assignment makes pointer from integer without a cast [enabled by default] p=strdup(c); ^ user.c:9:6: warning: unused variable ‘ok’ [-Wunused-variable] int ok = 0, print = 0, k = 0, i = 0, n = 0; ^ user.c:8:7: warning: unused variable ‘cc’ [-Wunused-variable] char cc; ^ user.c:13:7: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c, 1, 2097152, in); ^