replace.cpp: In function 'int main()': replace.cpp:46: warning: name lookup of 'i' changed replace.cpp:27: warning: matches this 'i' under ISO standard rules replace.cpp:44: warning: matches this 'i' under old rules replace.cpp:54: warning: comparison between signed and unsigned integer expressions replace.cpp:56: warning: comparison between signed and unsigned integer expressions replace.cpp:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result replace.cpp:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result replace.cpp:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result replace.cpp:20: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result replace.cpp:21: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result replace.cpp:26: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccq40mSk.o: In function `main': replace.cpp:(.text+0x96): warning: the `gets' function is dangerous and should not be used.