Compilare: user.cpp: In function ‘int main()’: user.cpp:35:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i != strlen(s)) ^ user.cpp:40:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s[i] != '"' && i != strlen(s)) ^ user.cpp:60:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s[i] != '"' && i != strlen(s)) ^ user.cpp:63:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s[i] != '"' && i != strlen(s)) ^ user.cpp:76:70: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s[i] != '"' && (s[i] < '0' || s[i] > '9') && i != strlen(s)) ^ user.cpp:98:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s[i] >= '0' && s[i] <= '9' && i != strlen(s)) ^ user.cpp:25:29: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(s,sizeof(char),dim,f); ^