What will be the output of the program? #include<stdio.h> int reverse(int); int

CuriousTab

Home Aptitude

Discussion

Home ‣ C Programming ‣ Functions See What Others Are Saying!

Question

Options
A. Print 5, 4, 3, 2, 1
B. Print 1, 2, 3, 4, 5
C. Print 5, 4, 3, 2, 1, 0
D. Infinite loop

Correct Answer

Infinite loop

Explanation

Step 1: int no=5; The variable no is declared as integer type and initialized to 5.

Step 2: reverse(no); becomes reverse(5); It calls the function reverse() with '5' as parameter.

The function reverse accept an integer number 5 and it returns '0'(zero) if(5 == 0) if the given number is '0'(zero) or else printf("%d,", no); it prints that number 5 and calls the function reverse(5);.

The function runs infinetely because the there is a post-decrement operator is used. It will not decrease the value of 'n' before calling the reverse() function. So, it calls reverse(5) infinitely.

Note: If we use pre-decrement operator like reverse(--n), then the output will be 5, 4, 3, 2, 1. Because before calling the function, it decrements the value of 'n'.

More questions

1. Point out the error in the program.

#include<stdio.h>
const char *fun();

int main()
{
    *fun() = 'A';
    return 0;
}
const char *fun()
{
    return "Hello";
}

Options
A. Error: RValue required
B. Error: Lvalue required
C. Error: fun() returns a pointer const character which cannot be modified
D. No error

Discuss

2. Which statement will you add to the following program to ensure that the program outputs "CuriousTab" on execution?

#include<stdio.h>

int main()
{
    char s[] = "CuriousTab";
    char t[25];
    char *ps, *pt;
    ps = s;
    pt = t;
    while(*ps)
        *pt++ = *ps++;

    /* Add a statement here */
    printf("%s\n", t);
    return 0;
}

Options
A. *pt='';
B. pt='\0';
C. pt='\n';
D. *pt='\0';

Discuss

3. A float occupies 4 bytes. If the hexadecimal equivalent of these 4 bytes are A, B, C and D, then when this float is stored in memory in which of the following order do these bytes gets stored?
Options
A. ABCD
B. DCBA
C. 0xABCD
D. Depends on big endian or little endian architecture

Discuss

4. To print out a and b given below, which of the following printf() statement will you use?
```
#include<stdio.h>

float a=3.14;
double b=3.14;
```
Options
A. printf("%f %lf", a, b);
B. printf("%Lf %f", a, b);
C. printf("%Lf %Lf", a, b);
D. printf("%f %Lf", a, b);

Discuss

5. Which of the following function is more appropriate for reading in a multi-word string?
Options
A. printf();
B. scanf();
C. gets();
D. puts();

Discuss

Correct Answer: gets();

Explanation:

gets(); collects a string of characters terminated by a new line from the standard input stream stdin

#include <stdio.h>

int main(void)
{
   char string[80];

   printf("Enter a string:");
   gets(string);
   printf("The string input was: %s\n", string);
   return 0;
}

Output:

Enter a string: CuriousTab

The string input was: CuriousTab

6. What will be the output of the program if the array begins at address 65486?

#include<stdio.h>

int main()
{
    int arr[] = {12, 14, 15, 23, 45};
    printf("%u, %u\n", arr, &arr);
    return 0;
}

Options
A. 65486, 65488
B. 65486, 65486
C. 65486, 65490
D. 65486, 65487

Discuss

7. What will be the output of the program in Turbo C (under DOS)?

#include<stdio.h>

int main()
{
    struct emp
    {
        char *n;
        int age;
    };
    struct emp e1 = {"Dravid", 23};
    struct emp e2 = e1;
    strupr(e2.n);
    printf("%s\n", e1.n);
    return 0;
}

Options
A. Error: Invalid structure assignment
B. DRAVID
C. Dravid
D. No output

Discuss

8. Does there any function exist to convert the int or float to a string?
Options
A. Yes
B. No

Discuss

Correct Answer: Yes

Explanation:

1. itoa() converts an integer to a string.
2. ltoa() converts a long to a string.
3. ultoa() converts an unsigned long to a string.
4. sprintf() sends formatted output to a string, so it can be used to convert any type of values to string type.

#include<stdio.h>
#include<stdlib.h>

int main(void)
{
   int   num1 = 12345;
   float num2 = 5.12;
   char str1[20];
   char str2[20];

   itoa(num1, str1, 10); /* 10 radix value */
   printf("integer = %d string = %s \n", num1, str1);

   sprintf(str2, "%f", num2);
   printf("float = %f string = %s", num2, str2);

   return 0;
}

// Output:
// integer = 12345 string = 12345
// float = 5.120000 string = 5.120000

9. Which of the following special symbol allowed in a variable name?
Options
A. * (asterisk)
B. | (pipeline)
C. - (hyphen)
D. _ (underscore)

Discuss

10. What will be the output of the program?

#include<stdio.h>
typedef unsigned long int uli;
typedef uli u;

int main()
{
    uli a;
    u b = -1;
    a = -1;
    printf("%lu, %lu", a, b);
    return 0;
}

Options
A. 4343445454, 4343445454
B. 4545455434, 4545455434
C. 4294967295, 4294967295
D. Garbage values

Discuss

Comments

There are no comments.

CuriousTab

CuriousTab

Discussion

What will be the output of the program?
#include<stdio.h> int reverse(int); int main() { int no=5; reverse(no); return 0; } int reverse(int no) { if(no == 0) return 0; else printf("%d,", no); reverse (no--); }

More questions

More in C Programming:

Aptitude

Engineering

Programming

Reasoning

Links

CuriousTab

CuriousTab

Discussion

What will be the output of the program? #include<stdio.h> int reverse(int); int main() { int no=5; reverse(no); return 0; } int reverse(int no) { if(no == 0) return 0; else printf("%d,", no); reverse (no--); }

More questions

More in C Programming:

Aptitude

Engineering

Programming

Reasoning

Links

Social

What will be the output of the program?
#include<stdio.h> int reverse(int); int main() { int no=5; reverse(no); return 0; } int reverse(int no) { if(no == 0) return 0; else printf("%d,", no); reverse (no--); }