triunghi6.cpp: In function 'int mut1()': triunghi6.cpp:9: warning: unused variable 'j' triunghi6.cpp:16: warning: no return statement in function returning non-void triunghi6.cpp: In function 'int main()': triunghi6.cpp:36: warning: unused variable 'b' triunghi6.cpp:36: warning: unused variable 'ca' triunghi6.cpp:36: warning: unused variable 'cb' triunghi6.cpp:22: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result triunghi6.cpp:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result