Compilare: main.c: In function 'sub_sir': main.c:9:24: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration] unsigned int lenght_B=strlen(B); ^~~~~~ main.c:9:24: warning: incompatible implicit declaration of built-in function 'strlen' main.c:9:24: note: include '<string.h>' or provide a declaration of 'strlen' main.c:16:6: warning: implicit declaration of function 'strcmp' [-Wimplicit-function-declaration] if (strcmp(A,B)==0) ^~~~~~ main.c: In function 'main': main.c:46:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &lungime_sir); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:48:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &nr_subsiruri); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:55:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%s", A); ^~~~~~~~~~~~~~~~~~~ main.c:63:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%s", B); ^~~~~~~~~~~~~~~~~~~