#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 *);
char *strlen(char *);
int main() {
  char name[40];
  printf("What's your first name?\n");
  scanf("%s", name);
  printf("\"%s\"\n", name);
  printf("\"%20s\"\n", name);
  printf("\"%-20s\"\n", name);
  printf("\"%*s\"\n", strlen(name) + 3, name);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeba(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    -0x30(%rbp),%rsi
lea    0xec1(%rip),%rdi
call   1050 <scanf@plt>
lea    -0x30(%rbp),%rsi
lea    0xeb4(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    -0x30(%rbp),%rsi
lea    0xea8(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    -0x30(%rbp),%rsi
lea    0xe9e(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    -0x30(%rbp),%rdi
call   1030 <strlen@plt>
mov    %rax,%rsi
add    $0x3,%rsi
lea    -0x30(%rbp),%rdx
lea    0xe85(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x30,%rsp
lea    0xed5(%rip),%rdi
call   1030 <puts@plt>
lea    0xea8(%rip),%rdi
mov    %rsp,%rbx
mov    %rbx,%rsi
call   1060 <scanf@plt>
lea    0xe99(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1050 <printf@plt>
lea    0xe8e(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1050 <printf@plt>
lea    0xe85(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1050 <printf@plt>
mov    %rbx,%rdi
call   1040 <strlen@plt>
lea    0x3(%rax),%rsi
lea    0xe71(%rip),%rdi
mov    %rbx,%rdx
xor    %eax,%eax
call   1050 <printf@plt>
xor    %eax,%eax
add    $0x30,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [25 x i8] c"What's your first name?\0A\00"
@.str.1 = [3 x i8] c"%s\00"
@.str.2 = [6 x i8] c"\22%s\22\0A\00"
@.str.3 = [8 x i8] c"\22%20s\22\0A\00"
@.str.4 = [9 x i8] c"\22%-20s\22\0A\00"
@.str.5 = [7 x i8] c"\22%*s\22\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [40 x i8]
store i32 0, i32* %1
%3 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0))
%4 = getelementptr inbounds [40 x i8], [40 x i8]* %2, i64 0, i64 0
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %4)
%6 = getelementptr inbounds [40 x i8], [40 x i8]* %2, i64 0, i64 0
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.2, i64 0, i64 0), i8* %6)
%8 = getelementptr inbounds [40 x i8], [40 x i8]* %2, i64 0, i64 0
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.3, i64 0, i64 0), i8* %8)
%10 = getelementptr inbounds [40 x i8], [40 x i8]* %2, i64 0, i64 0
%11 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.4, i64 0, i64 0), i8* %10)
%12 = getelementptr inbounds [40 x i8], [40 x i8]* %2, i64 0, i64 0
%13 = call i8* @strlen(i8* %12)
%14 = getelementptr inbounds i8, i8* %13, i64 3
%15 = getelementptr inbounds [40 x i8], [40 x i8]* %2, i64 0, i64 0
%16 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.5, i64 0, i64 0), i8* %14, i8* %15)
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [3 x i8] c"%s\00"
@.str.2 = [6 x i8] c"\22%s\22\0A\00"
@.str.3 = [8 x i8] c"\22%20s\22\0A\00"
@.str.4 = [9 x i8] c"\22%-20s\22\0A\00"
@.str.5 = [7 x i8] c"\22%*s\22\0A\00"
@str = [24 x i8] c"What's your first name?\00"
define i32 @main() {
%1 = alloca [40 x i8]
%2 = getelementptr inbounds [40 x i8], [40 x i8]* %1, i64 0, i64 0
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([24 x i8], [24 x i8]* @str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %2)
%5 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str.2, i64 0, i64 0), i8* %2)
%6 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.3, i64 0, i64 0), i8* %2)
%7 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([9 x i8], [9 x i8]* @.str.4, i64 0, i64 0), i8* %2)
%8 = call i8* @strlen(i8* %2)
%9 = getelementptr inbounds i8, i8* %8, i64 3
%10 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str.5, i64 0, i64 0), i8* %9, i8* %2)
ret i32 0
}