Compilare: user.c: In function ‘main’: user.c:17:7: warning: implicit declaration of function ‘strlen’ [-Wimplicit-function-declaration] L=strlen(Txt); ^~~~~~ user.c:17:7: warning: incompatible implicit declaration of built-in function ‘strlen’ user.c:17:7: note: include ‘<string.h>’ or provide a declaration of ‘strlen’ user.c:15:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%s", Txt); ^~~~~~~~~~~~~~~~~~~~~~ user.c:16:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &Q); ^~~~~~~~~~~~~~~~~~~~~ user.c:23:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &find); ^~~~~~~~~~~~~~~~~~~~~~~~