Compilare: main.c: In function 'sub_sir': main.c:23:31: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration] for (unsigned int i = 0; i < strlen(B); i++) ^~~~~~ main.c:23:31: warning: incompatible implicit declaration of built-in function 'strlen' main.c:23:31: note: include '<string.h>' or provide a declaration of 'strlen' main.c: In function 'main': main.c:51:13: warning: implicit declaration of function 'malloc' [-Wimplicit-function-declaration] A = (char*)malloc(sizeof(char) * lungime_sir + 1); ^~~~~~ main.c:51:13: warning: incompatible implicit declaration of built-in function 'malloc' main.c:51:13: note: include '<stdlib.h>' or provide a declaration of 'malloc' main.c:58:11: warning: implicit declaration of function 'strcmp' [-Wimplicit-function-declaration] } while (strcmp(A,"\n")==0); ^~~~~~ main.c:84:2: warning: implicit declaration of function 'free' [-Wimplicit-function-declaration] free(A); ^~~~ main.c:84:2: warning: incompatible implicit declaration of built-in function 'free' main.c:84:2: note: include '<stdlib.h>' or provide a declaration of 'free' main.c:42:47: warning: unused variable 'c' [-Wunused-variable] unsigned int lungime_sir, nr_subsiruri, max, c; ^ main.c:47:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &lungime_sir); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:49:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &nr_subsiruri); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:57:3: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result] fgets(A, lungime_sir + 1, in); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:67:4: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result] fgets(B, lungime_sir+1, in); ^~~~~~~~~~~~~~~~~~~~~~~~~~~