Compilare: user.cpp: In function ‘int main()’: user.cpp:16:22: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while(c>='A' && c<='Z' || c>='0' && c<='9') ^ user.cpp:36:22: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while(c>='a' && c<='z' || c>='0' && c<='9') ^ user.cpp:43:27: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] if(k==1) {t++;s[t]=NULL;} ^ user.cpp:13:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c",&c); ^ user.cpp:20:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c",&c); ^ user.cpp:26:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c",&c); ^ user.cpp:33:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c",&c); ^ user.cpp:40:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c",&c); ^ user.cpp:69:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] if(c==',') fscanf(f,"%c",&c); ^