prog.c: In function 'main':
prog.c:5:21: error: unused variable 'f' [-Werror=unused-variable]
int a=0,b,c,d,e,f,g,sum=0,i=1000;
^
prog.c:5:19: error: unused variable 'e' [-Werror=unused-variable]
int a=0,b,c,d,e,f,g,sum=0,i=1000;
^
prog.c:5:17: error: unused variable 'd' [-Werror=unused-variable]
int a=0,b,c,d,e,f,g,sum=0,i=1000;
^
prog.c:5:15: error: unused variable 'c' [-Werror=unused-variable]
int a=0,b,c,d,e,f,g,sum=0,i=1000;
^
cc1: all warnings being treated as errors