2 examples for gcc

  # gcc is used to compile C source code, for C++ (and even C) use g++
# use -o to specify your own output filename
gcc ".c file here" -o "outfile name here"
# g++ uses virtually the same syntax
# to specifiy optimization levels, use -O
gcc -Os ".c file here" -o "outfile name here"
        

  # preprocess a file, but without #line statements
# the same also works with g++ and clang/clang++
# by default, this will write the result to standard output, '-o' writes the
# preprocessed output to 'output.c'
gcc -E -P yourfile.c -o output.c