Code:
baz.cpp: In function ‘int main()’:
baz.cpp:16:10: warning: unused variable ‘character’ [-Wunused-variable]
char character;
^
baz.cpp:17:12: warning: unused variable ‘i’ [-Wunused-variable]
double i,u1,u2,u3,u4,u5,u6,u7,u8,p,temperature_in_Kelvin,surface_area_millimeter_square;
^
baz.cpp:17:20: warning: unused variable ‘u3’ [-Wunused-variable]
double i,u1,u2,u3,u4,u5,u6,u7,u8,p,temperature_in_Kelvin,surface_area_millimeter_square;
^
baz.cpp:17:23: warning: unused variable ‘u4’ [-Wunused-variable]
double i,u1,u2,u3,u4,u5,u6,u7,u8,p,temperature_in_Kelvin,surface_area_millimeter_square;
^
baz.cpp:17:26: warning: unused variable ‘u5’ [-Wunused-variable]
double i,u1,u2,u3,u4,u5,u6,u7,u8,p,temperature_in_Kelvin,surface_area_millimeter_square;
^
baz.cpp:17:29: warning: unused variable ‘u6’ [-Wunused-variable]
double i,u1,u2,u3,u4,u5,u6,u7,u8,p,temperature_in_Kelvin,surface_area_millimeter_square;
^
baz.cpp:17:32: warning: unused variable ‘u7’ [-Wunused-variable]
double i,u1,u2,u3,u4,u5,u6,u7,u8,p,temperature_in_Kelvin,surface_area_millimeter_square;
^
baz.cpp:17:35: warning: unused variable ‘u8’ [-Wunused-variable]
double i,u1,u2,u3,u4,u5,u6,u7,u8,p,temperature_in_Kelvin,surface_area_millimeter_square;
^
baz.cpp:17:38: warning: variable ‘p’ set but not used [-Wunused-but-set-variable]
double i,u1,u2,u3,u4,u5,u6,u7,u8,p,temperature_in_Kelvin,surface_area_millimeter_square;
^
The last one is interesting, you calculate a p, but then just decide to print u1 anyway.