#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, char *);
int /*<<< orphan*/ system(char *);
int main(int argc, const char *argv[]) {
  char first_name[10], last_name[10];
  printf("Your first name: ");
  scanf("%s", first_name);
  printf("Your last name: ");
  scanf("%s", last_name);
  printf("Hello, %s %s\n", first_name, last_name);
  system("pause");
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
lea    0xeb3(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    -0x1a(%rbp),%rsi
lea    0xeb3(%rip),%rdi
call   1050 <scanf@plt>
lea    0xeaa(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    -0x24(%rbp),%rsi
lea    0xe95(%rip),%rdi
call   1050 <scanf@plt>
lea    -0x1a(%rbp),%rsi
lea    -0x24(%rbp),%rdx
lea    0xe95(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xe95(%rip),%rdi
call   1030 <system@plt>
xor    %eax,%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
sub    $0x20,%rsp
lea    0xec0(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xec4(%rip),%r15
lea    0x16(%rsp),%r14
mov    %r15,%rdi
mov    %r14,%rsi
call   1050 <scanf@plt>
lea    0xeb0(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xc(%rsp),%rbx
mov    %r15,%rdi
mov    %rbx,%rsi
call   1050 <scanf@plt>
lea    0xea3(%rip),%rdi
mov    %r14,%rsi
mov    %rbx,%rdx
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xe9d(%rip),%rdi
call   1030 <system@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [18 x i8] c"Your first name: \00"
@.str.1 = [3 x i8] c"%s\00"
@.str.2 = [17 x i8] c"Your last name: \00"
@.str.3 = [14 x i8] c"Hello, %s %s\0A\00"
@.str.4 = [6 x i8] c"pause\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca [10 x i8]
%7 = alloca [10 x i8]
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str, i64 0, i64 0))
%9 = getelementptr inbounds [10 x i8], [10 x i8]* %6, i64 0, i64 0
%10 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %9)
%11 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0))
%12 = getelementptr inbounds [10 x i8], [10 x i8]* %7, i64 0, i64 0
%13 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %12)
%14 = getelementptr inbounds [10 x i8], [10 x i8]* %6, i64 0, i64 0
%15 = getelementptr inbounds [10 x i8], [10 x i8]* %7, i64 0, i64 0
%16 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.3, i64 0, i64 0), i8* %14, i8* %15)
%17 = call i32 @system(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.4, i64 0, i64 0))
ret i32 0
}

LLVM IR (-O2):
@.str = [18 x i8] c"Your first name: \00"
@.str.1 = [3 x i8] c"%s\00"
@.str.2 = [17 x i8] c"Your last name: \00"
@.str.3 = [14 x i8] c"Hello, %s %s\0A\00"
@.str.4 = [6 x i8] c"pause\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca [10 x i8]
%4 = alloca [10 x i8]
%5 = getelementptr inbounds [10 x i8], [10 x i8]* %3, i64 0, i64 0
%6 = getelementptr inbounds [10 x i8], [10 x i8]* %4, i64 0, i64 0
%7 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([18 x i8], [18 x i8]* @.str, i64 0, i64 0))
%8 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %5)
%9 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0))
%10 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %6)
%11 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([14 x i8], [14 x i8]* @.str.3, i64 0, i64 0), i8* %5, i8* %6)
%12 = call i32 @system(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.4, i64 0, i64 0))
ret i32 0
}