Compilare: user.c: In function ‘basicSearch’: user.c:9:2: warning: implicit declaration of function ‘strlen’ [-Wimplicit-function-declaration] int len = strlen(pattern); ^ user.c:9:12: warning: incompatible implicit declaration of built-in function ‘strlen’ [enabled by default] int len = strlen(pattern); ^ user.c:14:3: warning: implicit declaration of function ‘strncmp’ [-Wimplicit-function-declaration] if (!strncmp(p, pattern, len) && num < 1000) { ^ user.c: In function ‘main’: user.c:28:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in", "r", stdin); ^ user.c:29:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out", "w", stdout); ^ user.c:34:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", pattern); ^ user.c:35:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", str); ^