Compilare: main.c: In function 'sub_sir': main.c:22:6: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration] if (strlen(B) > strlen(A)) ^~~~~~ main.c:22:6: warning: incompatible implicit declaration of built-in function 'strlen' main.c:22:6: note: include '<string.h>' or provide a declaration of 'strlen' main.c:25:8: warning: implicit declaration of function 'malloc' [-Wimplicit-function-declaration] aux = malloc(strlen(A)*sizeof(char) + 1); ^~~~~~ main.c:25:8: warning: incompatible implicit declaration of built-in function 'malloc' main.c:25:8: note: include '<stdlib.h>' or provide a declaration of 'malloc' main.c:25:15: warning: incompatible implicit declaration of built-in function 'strlen' aux = malloc(strlen(A)*sizeof(char) + 1); ^~~~~~ main.c:25:15: note: include '<string.h>' or provide a declaration of 'strlen' main.c:27:2: warning: implicit declaration of function 'strcpy' [-Wimplicit-function-declaration] strcpy(aux, A); ^~~~~~ main.c:27:2: warning: incompatible implicit declaration of built-in function 'strcpy' main.c:27:2: note: include '<string.h>' or provide a declaration of 'strcpy' main.c: In function 'main': main.c:56:6: warning: incompatible implicit declaration of built-in function 'malloc' A = malloc(sizeof(char) * lungime_sir + 1); ^~~~~~ main.c:56:6: note: include '<stdlib.h>' or provide a declaration of 'malloc' main.c:52:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &lungime_sir); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:54:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &nr_subsiruri); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:59:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%s", A); ^~~~~~~~~~~~~~~~~~~ main.c:65:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%s", B); ^~~~~~~~~~~~~~~~~~~