Compilare: user.c: In function ‘eval’: user.c:9:2: warning: implicit declaration of function ‘termen’ [-Wimplicit-function-declaration] r = termen(str); ^ user.c: In function ‘termen’: user.c:30:2: warning: implicit declaration of function ‘factor’ [-Wimplicit-function-declaration] r = factor(str); ^ user.c: In function ‘main’: user.c:79:2: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration] str = (char*)malloc(sizeof(char) *100001); ^ user.c:79:15: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] str = (char*)malloc(sizeof(char) *100001); ^ user.c:77:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.in", "r", stdin); ^ user.c:78:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.out", "w", stdout); ^ user.c:80:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", str); ^