C String Questions

June 23, 2019

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Question 1

Time: 00:00:00
What is the expected output of the following program ?
#include <stdio.h>

int main()

{

    char str[] = "%d %c", arr[] = "PrepInsta";

    printf(str, 0[arr], 2[arr +2]);

    return 0;

}

P Q

P Q

80 Q

80 Q

80 73

80 73

Compilation error, because of incorrect initialization.

Compilation error, because of incorrect initialization.

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Question 2

Time: 00:00:00
What will be printed by the following program ?
#include <stdio.h>

int main()

{

    char p[] = "prepster";

    char t;

    int i, m, j;

    for(i=0,j=(strlen(p)); i<j;m++, i++)

    {

        t=p[i];

        p[i]=p[j-i];

        printf("%c",p[i]);

    }

    return 0;

}

retsperp

retsperp

retsster

retsster

retster

retster

sterprep

sterprep

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Question 3

Time: 00:00:00
What will be printed by the code below given that the size of a char value is 1 byte.
#include<stdio.h>

int main()

{

    char str[20] = "PrepSter";

    printf ("%d", sizeof(str));

    return 0;

}

9

9

8

8

20

20

19

19

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Question 4

Time: 00:00:00
What will be printed by the C code below ?
#include<stdio.h>

int main()

{

    char str[20] = "PrepSter";

    printf ("%c", str[11]);

    return 0;

}

Compilation error.

Compilation error.

Some garbage value

Some garbage value

(null)

(null)

0

0

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Question 5

Time: 00:00:00
What is the output of the program below ?
#include<stdio.h>

int main()

{

    char *str1 = "PrepSter";

    char str2[] = "PrepSter";

 

    printf("%d %d",

           sizeof(str1), sizeof(str2));

    return 0;

}

8 9

8 9

8 8

8 8

9 8

9 8

8 7

8 7

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Question 6

Time: 00:00:00
If fun("Prep Insta") is called in the main function, what will be printed by the following code ?
void fun(char *a)

{

  if (*a && *a != ` `)

  {

     fun(a+1);

     putchar(*a);

  }

}

Prep

Prep

Prep Insta

Prep Insta

perP

perP

atsnI preP

atsnI preP

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Question 7

Time: 00:00:00
What is the output of the following program ?
#include<stdio.h>

int main()

{

    char arr[7] = "12345", *p;

    p = arr + 2;

    *p = '0' ;

    printf ("%s", arr);

}

12045

12045

(null)

(null)

12300

12300

10345

10345

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Question 8

Time: 00:00:00
What is the correct output of the given program ?
#include <stdio.h>

struct ch

{

  char x, y, z;

};

int main() 

{

  struct ch p = {'l', '0', 'x' + 2};

  struct ch *q = &p;

  printf("%c, %c", *((char *)q + 1), *((char *)q + 2));

  return 0;

}

l +1, x+2

l +1, x+2

0, z+2

0, z+2

0, z

0, z

'0', 'z'

'0', 'z'

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Question 9

Time: 00:00:00
What is the correct output of the code given below ?
#include <stdio.h>

int main()

{

    char str[] = "raajpoppla";

    int i=1;

    for(i=1;i<strlen(str);i++)

    {

    	if(str[i]==str[i-1])

    	{

    		printf("%c",str[i-1]);

		}

	}

    return 0;

}

rajpopla

rajpopla

aapp

aapp

rjpola

rjpola

ap

ap

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Question 10

Time: 00:00:00
What is the output of the C code below ?
#include <stdio.h>

int main()

{

    char *s1 = (char *)malloc(50);

    char *s2 = (char *)malloc(50);

    strcpy(s1, "Prep");

    strcpy(s2, "Insta");

    strcat(s1, s2);

    printf("%s", s1);

    return 0;

}

Prep

Prep

Insta

Insta

Prep Insta

Prep Insta

PrepInsta

PrepInsta

(null)

(null)

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["0","40","60","80","100"]
["Need more practice!","Keep trying!","Not bad!","Good work!","Perfect!"]
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