Compilare: main.c: In function 'sub_sir': main.c:8:24: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration] unsigned int lenght_B=strlen(B); ^~~~~~ main.c:8:24: warning: incompatible implicit declaration of built-in function 'strlen' main.c:8:24: note: include '<string.h>' or provide a declaration of 'strlen' main.c:15:6: warning: implicit declaration of function 'strcmp' [-Wimplicit-function-declaration] if (strcmp(A,B)==0) ^~~~~~ main.c: In function 'main': main.c:51:6: warning: implicit declaration of function 'malloc' [-Wimplicit-function-declaration] A = malloc(size); ^~~~~~ main.c:51:6: warning: incompatible implicit declaration of built-in function 'malloc' main.c:51:6: note: include '<stdlib.h>' or provide a declaration of 'malloc' main.c:60:3: warning: implicit declaration of function 'free' [-Wimplicit-function-declaration] free(B); ^~~~ main.c:60:3: warning: incompatible implicit declaration of built-in function 'free' main.c:60:3: note: include '<stdlib.h>' or provide a declaration of 'free' main.c:73:2: warning: incompatible implicit declaration of built-in function 'free' free(A); ^~~~ main.c:73:2: note: include '<stdlib.h>' or provide a declaration of 'free' main.c:45:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &lungime_sir); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:47:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &nr_subsiruri); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:54:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%s", A); ^~~~~~~~~~~~~~~~~~~ main.c:62:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%s", B); ^~~~~~~~~~~~~~~~~~~