#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*/ free(char *);
char *malloc(int);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, ...);
int main(int argc, char **argv) {
  int sizeOfString;
  printf("What size of string do you need?");
  scanf("%d", &sizeOfString);
  char *str = malloc(sizeof(char) * sizeOfString);
  printf("Type the string: ");
  scanf("%s", str);
  printf("The string is: %s\n", str);
  free(str);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
lea    0xea3(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xeb6(%rip),%rdi
lea    -0x14(%rbp),%rsi
mov    $0x0,%al
call   1060 <scanf@plt>
movslq -0x14(%rbp),%rax
shl    $0x0,%rax
mov    %eax,%edi
call   1050 <malloc@plt>
mov    %rax,-0x20(%rbp)
lea    0xe94(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    -0x20(%rbp),%rsi
lea    0xe94(%rip),%rdi
mov    $0x0,%al
call   1060 <scanf@plt>
mov    -0x20(%rbp),%rsi
lea    0xe85(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    -0x20(%rbp),%rdi
call   1030 <free@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
lea    0xeb4(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xec7(%rip),%rdi
lea    0xc(%rsp),%rsi
xor    %eax,%eax
call   1060 <scanf@plt>
mov    0xc(%rsp),%edi
call   1050 <malloc@plt>
mov    %rax,%rbx
lea    0xeab(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xeaf(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1060 <scanf@plt>
lea    0xea1(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
call   1030 <free@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [33 x i8] c"What size of string do you need?\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [18 x i8] c"Type the string: \00"
@.str.3 = [3 x i8] c"%s\00"
@.str.4 = [19 x i8] c"The string is: %s\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i8*
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @.str, i64 0, i64 0))
%9 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %6)
%10 = load i32, i32* %6
%11 = sext i32 %10 to i64
%12 = mul i64 1, %11
%13 = trunc i64 %12 to i32
%14 = call i8* @malloc(i32 %13)
store i8* %14, i8** %7
%15 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.2, i64 0, i64 0))
%16 = load i8*, i8** %7
%17 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0), i8* %16)
%18 = load i8*, i8** %7
%19 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.4, i64 0, i64 0), i8* %18)
%20 = load i8*, i8** %7
%21 = call i32 @free(i8* %20)
ret i32 0
}

LLVM IR (-O2):
@.str = [33 x i8] c"What size of string do you need?\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [18 x i8] c"Type the string: \00"
@.str.3 = [3 x i8] c"%s\00"
@.str.4 = [19 x i8] c"The string is: %s\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca i32
%4 = bitcast i32* %3 to i8*
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([33 x i8], [33 x i8]* @.str, i64 0, i64 0))
%6 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %3)
%7 = load i32, i32* %3
%8 = call i8* @malloc(i32 %7)
%9 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([18 x i8], [18 x i8]* @.str.2, i64 0, i64 0))
%10 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0), i8* %8)
%11 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 x i8]* @.str.4, i64 0, i64 0), i8* %8)
%12 = call i32 @free(i8* %8)
ret i32 0
}