#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 **);
main() {
  char s[100];
  int i = 0, count = 0;
  printf("Enter the string");
  scanf("%s", &s);
  for (i = 0; s[i] != '\0'; i++) {
    count++;
  }
  printf("Length of the string is %d", count);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x80,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0x74(%rbp)
movl   $0x0,-0x78(%rbp)
lea    0xeb9(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x70(%rbp),%rsi
lea    0xeb8(%rip),%rdi
call   1040 <scanf@plt>
movl   $0x0,-0x74(%rbp)
movslq -0x74(%rbp),%rax
movsbl -0x70(%rbp,%rax,1),%eax
cmp    $0x0,%eax
je     118e <main+0x6e>
mov    -0x78(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x78(%rbp)
mov    -0x74(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x74(%rbp)
jmp    1165 <main+0x45>
mov    -0x78(%rbp),%esi
lea    0xe7c(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x80,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x70,%rsp
lea    0xed4(%rip),%rdi
xor    %ebx,%ebx
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xed5(%rip),%rdi
mov    %rsp,%rsi
call   1040 <scanf@plt>
cmpb   $0x0,(%rsp)
je     115b <main+0x3b>
xor    %ebx,%ebx
nopl   0x0(%rax)
cmpb   $0x0,0x1(%rsp,%rbx,1)
lea    0x1(%rbx),%rbx
jne    1150 <main+0x30>
lea    0xeb2(%rip),%rdi
mov    %ebx,%esi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x70,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [17 x i8] c"Enter the string\00"
@.str.1 = [3 x i8] c"%s\00"
@.str.2 = [27 x i8] c"Length of the string is %d\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [100 x i8]
%3 = alloca i32
%4 = alloca i32
store i32 0, i32* %1
store i32 0, i32* %3
store i32 0, i32* %4
%5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0))
%6 = bitcast [100 x i8]* %2 to i8**
%7 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8** %6)
store i32 0, i32* %3
br label %8
8: ; preds = %18, %0
%9 = load i32, i32* %3
%10 = sext i32 %9 to i64
%11 = getelementptr inbounds [100 x i8], [100 x i8]* %2, i64 0, i64 %10
%12 = load i8, i8* %11
%13 = sext i8 %12 to i32
%14 = icmp ne i32 %13, 0
br i1 %14, label %15, label %21
15: ; preds = %8
%16 = load i32, i32* %4
%17 = add nsw i32 %16, 1
store i32 %17, i32* %4
br label %18
18: ; preds = %15
%19 = load i32, i32* %3
%20 = add nsw i32 %19, 1
store i32 %20, i32* %3
br label %8
21: ; preds = %8
%22 = load i32, i32* %4
%23 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.2, i64 0, i64 0), i32 %22)
ret i32 0
}

LLVM IR (-O2):
@.str = [17 x i8] c"Enter the string\00"
@.str.1 = [3 x i8] c"%s\00"
@.str.2 = [27 x i8] c"Length of the string is %d\00"
define i32 @main() {
%1 = alloca [100 x i8]
%2 = getelementptr inbounds [100 x i8], [100 x i8]* %1, i64 0, i64 0
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0))
%4 = bitcast [100 x i8]* %1 to i8**
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8** %4)
%6 = load i8, i8* %2
%7 = icmp eq i8 %6, 0
br i1 %7, label %16, label %8
8: ; preds = %0, %8
%9 = phi i64 [ %10, %8 ], [ 0, %0 ]
%10 = add nuw nsw i64 %9, 1
%11 = getelementptr inbounds [100 x i8], [100 x i8]* %1, i64 0, i64 %10
%12 = load i8, i8* %11
%13 = icmp eq i8 %12, 0
br i1 %13, label %14, label %8
14: ; preds = %8
%15 = trunc i64 %10 to i32
br label %16
16: ; preds = %14, %0
%17 = phi i32 [ 0, %0 ], [ %15, %14 ]
%18 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([27 x i8], [27 x i8]* @.str.2, i64 0, i64 0), i32 %17)
ret i32 0
}