sl.cpp: In function 'int main()': sl.cpp:19: warning: format '%s' expects type 'char*', but argument 3 has type 'char (*)[20]' sl.cpp:16: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result sl.cpp:19: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result sl.cpp:21: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result