you can use here doc in the interactive shell.for example:
gcc -x c - <<eof#include <stdio.h>void foo(){ int a = 10; static int sa = 10; a += 5; sa += 5; printf("a = %d, sa = %d\n", a, sa);}int main(){ int i; for (i = 0; i < 10; ++i) foo();}eof
reference