suma4.cpp: In function 'int main()': suma4.cpp:39: warning: name lookup of 'j' changed suma4.cpp:10: warning: matches this 'j' under ISO standard rules suma4.cpp:37: warning: matches this 'j' under old rules suma4.cpp:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result suma4.cpp:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result suma4.cpp:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result suma4.cpp:13: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result suma4.cpp:34: warning: 'm1' may be used uninitialized in this function