Compilare: user.c: In function ‘main’: user.c:15:9: warning: implicit declaration of function ‘strlen’ [-Wimplicit-function-declaration] n=strlen(s); ^ user.c:15:11: warning: incompatible implicit declaration of built-in function ‘strlen’ [enabled by default] n=strlen(s); ^ user.c:10:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&t); ^ user.c:14:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%s",s); ^