#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 */
typedef int /*<<< orphan*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/ *, char *, char *, int);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, ...);
int main() {
  char name[50];
  int marks, i, num;
  printf("Enter number of students: ");
  scanf("%d", &num);
  FILE *fptr;
  fptr = (fopen("C:\\student.txt", "w"));
  if (fptr == NULL) {
    printf("Error!");
    exit(1);
  }
  for (i = 0; i < num; ++i) {
    printf("For student%d\nEnter name: ", i + 1);
    scanf("%s", name);
    printf("Enter marks: ");
    scanf("%d", &marks);
    fprintf(fptr, "\nName: %s \nMarks=%d \n", name, marks);
  }
  fclose(fptr);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x60,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xe8a(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xe97(%rip),%rdi
lea    -0x4c(%rbp),%rsi
mov    $0x0,%al
call   1060 <scanf@plt>
lea    0xe88(%rip),%rdi
lea    0xe90(%rip),%rsi
call   1070 <fopen@plt>
mov    %rax,-0x58(%rbp)
cmpq   $0x0,-0x58(%rbp)
jne    11c9 <main+0x69>
lea    0xe77(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    $0x1,%edi
call   1080 <exit@plt>
movl   $0x0,-0x48(%rbp)
mov    -0x48(%rbp),%eax
cmp    -0x4c(%rbp),%eax
jge    1247 <main+0xe7>
mov    -0x48(%rbp),%esi
add    $0x1,%esi
lea    0xe4d(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    -0x40(%rbp),%rsi
lea    0xe56(%rip),%rdi
mov    $0x0,%al
call   1060 <scanf@plt>
lea    0xe4b(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xe04(%rip),%rdi
lea    -0x44(%rbp),%rsi
mov    $0x0,%al
call   1060 <scanf@plt>
mov    -0x58(%rbp),%rdi
lea    -0x40(%rbp),%rdx
mov    -0x44(%rbp),%ecx
lea    0xe2e(%rip),%rsi
call   1050 <fprintf@plt>
mov    -0x48(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x48(%rbp)
jmp    11d0 <main+0x70>
mov    -0x58(%rbp),%rdi
call   1030 <fclose@plt>
xor    %eax,%eax
add    $0x60,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x48,%rsp
lea    0xe8b(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xe98(%rip),%rdi
lea    0x8(%rsp),%rsi
xor    %eax,%eax
call   1060 <scanf@plt>
lea    0xe88(%rip),%rdi
lea    0xe90(%rip),%rsi
call   1070 <fopen@plt>
test   %rax,%rax
je     1243 <main+0xe3>
mov    %rax,%r12
cmpl   $0x0,0x8(%rsp)
jle    122a <main+0xca>
lea    0x10(%rsp),%rbx
lea    0xe5a(%rip),%rbp
lea    0xc(%rsp),%r14
lea    0xe95(%rip),%r15
xor    %r13d,%r13d
add    $0x1,%r13d
lea    0xe5b(%rip),%rdi
mov    %r13d,%esi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xe65(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1060 <scanf@plt>
lea    0xe57(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbp,%rdi
mov    %r14,%rsi
xor    %eax,%eax
call   1060 <scanf@plt>
mov    0xc(%rsp),%ecx
mov    %r12,%rdi
mov    %r15,%rsi
mov    %rbx,%rdx
call   1050 <fprintf@plt>
cmp    0x8(%rsp),%r13d
jl     11d0 <main+0x70>
mov    %r12,%rdi
call   1030 <fclose@plt>
xor    %eax,%eax
add    $0x48,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret
lea    0xde5(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    $0x1,%edi
call   1080 <exit@plt>

LLVM IR (-O0):
@.str = [27 x i8] c"Enter number of students: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [15 x i8] c"C:\\student.txt\00"
@.str.3 = [2 x i8] c"w\00"
@.str.4 = [7 x i8] c"Error!\00"
@.str.5 = [27 x i8] c"For student%d\0AEnter name: \00"
@.str.6 = [3 x i8] c"%s\00"
@.str.7 = [14 x i8] c"Enter marks: \00"
@.str.8 = [22 x i8] c"\0AName: %s \0AMarks=%d \0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [50 x i8]
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
%6 = alloca i32*
store i32 0, i32* %1
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str, i64 0, i64 0))
%8 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %5)
%9 = call i32* @fopen(i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
store i32* %9, i32** %6
%10 = load i32*, i32** %6
%11 = icmp eq i32* %10, null
br i1 %11, label %12, label %15
12: ; preds = %0
%13 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.4, i64 0, i64 0))
%14 = call i32 @exit(i32 1)
unreachable
15: ; preds = %0
store i32 0, i32* %4
br label %16
16: ; preds = %32, %15
%17 = load i32, i32* %4
%18 = load i32, i32* %5
%19 = icmp slt i32 %17, %18
br i1 %19, label %20, label %35
20: ; preds = %16
%21 = load i32, i32* %4
%22 = add nsw i32 %21, 1
%23 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.5, i64 0, i64 0), i32 %22)
%24 = getelementptr inbounds [50 x i8], [50 x i8]* %2, i64 0, i64 0
%25 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.6, i64 0, i64 0), i8* %24)
%26 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.7, i64 0, i64 0))
%27 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %3)
%28 = load i32*, i32** %6
%29 = getelementptr inbounds [50 x i8], [50 x i8]* %2, i64 0, i64 0
%30 = load i32, i32* %3
%31 = call i32 @fprintf(i32* %28, i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.8, i64 0, i64 0), i8* %29, i32 %30)
br label %32
32: ; preds = %20
%33 = load i32, i32* %4
%34 = add nsw i32 %33, 1
store i32 %34, i32* %4
br label %16
35: ; preds = %16
%36 = load i32*, i32** %6
%37 = call i32 @fclose(i32* %36)
ret i32 0
}

LLVM IR (-O2):
@.str = [27 x i8] c"Enter number of students: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [15 x i8] c"C:\\student.txt\00"
@.str.3 = [2 x i8] c"w\00"
@.str.4 = [7 x i8] c"Error!\00"
@.str.5 = [27 x i8] c"For student%d\0AEnter name: \00"
@.str.6 = [3 x i8] c"%s\00"
@.str.7 = [14 x i8] c"Enter marks: \00"
@.str.8 = [22 x i8] c"\0AName: %s \0AMarks=%d \0A\00"
define i32 @main() {
%1 = alloca [50 x i8]
%2 = alloca i32
%3 = alloca i32
%4 = getelementptr inbounds [50 x i8], [50 x i8]* %1, i64 0, i64 0
%5 = bitcast i32* %2 to i8*
%6 = bitcast i32* %3 to i8*
%7 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([27 x i8], [27 x i8]* @.str, i64 0, i64 0))
%8 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %3)
%9 = call i32* @fopen(i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
%10 = icmp eq i32* %9, null
br i1 %10, label %14, label %11
11: ; preds = %0
%12 = load i32, i32* %3
%13 = icmp sgt i32 %12, 0
br i1 %13, label %17, label %28
14: ; preds = %0
%15 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str.4, i64 0, i64 0))
%16 = call i32 @exit(i32 1)
unreachable
17: ; preds = %11, %17
%18 = phi i32 [ %19, %17 ], [ 0, %11 ]
%19 = add nuw nsw i32 %18, 1
%20 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([27 x i8], [27 x i8]* @.str.5, i64 0, i64 0), i32 %19)
%21 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.6, i64 0, i64 0), i8* %4)
%22 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([14 x i8], [14 x i8]* @.str.7, i64 0, i64 0))
%23 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%24 = load i32, i32* %2
%25 = call i32 @fprintf(i32* %9, i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.8, i64 0, i64 0), i8* %4, i32 %24)
%26 = load i32, i32* %3
%27 = icmp slt i32 %19, %26
br i1 %27, label %17, label %28
28: ; preds = %17, %11
%29 = call i32 @fclose(i32* %9)
ret i32 0
}