#include <iostream> extern "C" int func(); // the definition of func is written in assembly language // raw string literal could be very useful asm(R"( .globl func .type func, @function func: .cfi_startproc movl $7, %eax ret .cfi_endproc )"); int main() { int n = func(); // extended inline assembly asm ("leal (%0,%0,4),%0" : "=r" (n) : "0" (n)); std::cout << "7*5 = " << n << std::endl; // flush is intentional // standard inline assembly asm ("movq $60, %rax\n\t" // the exit syscall number on Linux "movq $2, %rdi\n\t" // this program returns 2 "syscall"); }