Consider the following code. The function myStrcat concatenates two strings. It appends all characters of b to end of a. So the expected output is "Geeks Quiz". The program compiles fine but produces segmentation fault when run. C #include <stdio.h> void myStrcat(char *a, char *b) { int m = strlen(a); int n = strlen(b); int i; for (i = 0; i <= n; i++) a[m+i] = b[i]; } int main() { char *str1 = "Geeks "; char *str2 = "Quiz"; myStrcat(str1, str2); printf("%s ", str1); return 0; } Which of the following changes can correct the program so that it prints "Geeks Quiz"?

char *str1 = "Geeks "; can be changed to char str1[100] = "Geeks ";

char *str1 = "Geeks "; can be changed to char str1[100] = "Geeks "; and a line a[m+n-1] = ' 0 ' is added at the end of myStrcat

A line a[m+n-1] = ' 0 ' is added at the end of myStrcat

A line 'a = (char *)malloc(sizeof(char)*(strlen(a) + strlen(b) + 1)) is added at the beginning of myStrcat()

Output? C int main() { char a[2][3][3] = {'g','e','e','k','s','q','u','i','z'}; printf("%s ", **a); return 0; }

geeksquiz followed by garbage characters

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Question 1

Consider the following code. The function myStrcat concatenates two strings. It appends all characters of b to end of a. So the expected output is "Geeks Quiz". The program compiles fine but produces segmentation fault when run.

#include <stdio.h>

void myStrcat(char *a, char *b)
{
    int m = strlen(a);
    int n = strlen(b);
    int i;
    for (i = 0; i <= n; i++)
       a[m+i]  = b[i];
}

int main()
{
    char *str1 = "Geeks ";
    char *str2 = "Quiz";
    myStrcat(str1, str2);
    printf("%s ", str1);
    return 0;
}

Which of the following changes can correct the program so that it prints "Geeks Quiz"?

char *str1 = "Geeks "; can be changed to char str1[100] = "Geeks ";
char *str1 = "Geeks "; can be changed to char str1[100] = "Geeks "; and a line a[m+n-1] = \'\\0\' is added at the end of myStrcat
A line a[m+n-1] = \'\\0\' is added at the end of myStrcat
A line \'a = (char *)malloc(sizeof(char)*(strlen(a) + strlen(b) + 1)) is added at the beginning of myStrcat()

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Question 2

What is the output of following program ?

# include <stdio.h>

int main()
{
   char str1[] = "GeeksQuiz";
   char str2[] = {'G', 'e', 'e', 'k', 's', 'Q', 'u', 'i', 'z'};
   int n1 = sizeof(str1)/sizeof(str1[0]);
   int n2 = sizeof(str2)/sizeof(str2[0]);
   printf("n1 = %d, n2 = %d", n1, n2);
   return 0;
}

n1 = 10, n2 = 9
n1 = 10, n2 = 10
n1 = 9, n2 = 9
n1 = 9, n2 = 10

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Question 3

What is the output of following program?

#include<stdio.h>
void swap(char *str1, char *str2)
{
  char *temp = str1;
  str1 = str2;
  str2 = temp;
}  
  
int main()
{
  char *str1 = "Geeks";
  char *str2 = "Quiz";
  swap(str1, str2);
  printf("str1 is %s, str2 is %s", str1, str2);
  return 0;
}

str1 is Quiz, str2 is Geeks
str1 is Geeks, str2 is Quiz
str1 is Geeks, str2 is Geeks
str1 is Quiz, str2 is Quiz

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Question 4

Predict the output?

#include <stdio.h>
int fun(char *str1)
{
  char *str2 = str1;
  while(*++str1);
  return (str1-str2);
}

int main()
{
  char *str = "GeeksQuiz";
  printf("%d", fun(str));
  return 0;
}

10
9
8
Random Number

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Question 5

What does the following fragment of C-program print?

 char c[] = "GATE2011"; 
 char *p =c; 
 printf("%s", p + p[3] - p[1]) ;

GATE2011
E2011
2011
011

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Question 6

#include<stdio.h>
int main()
{
    char str[] = "GeeksQuiz";
    printf("%s %s %s ", &str[5], &5[str], str+5);
    printf("%c %c %c ", *(str+6), str[6], 6[str]);
    return 0;
}

Runtime Error
Compiler Error
uiz uiz uiz u u u
Quiz Quiz Quiz u u u

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Question 7

Output?

int main()
{
    char a[2][3][3] = {'g','e','e','k','s','q','u','i','z'};
    printf("%s ", **a);
    return 0;
}

Compiler Error
geeksquiz followed by garbage characters
geeksquiz
Runtime Error

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Question 8

Consider the following C program segment:

 char p[20]; 
 char *s = "string"; 
 int length = strlen(s); 
 int i; 
 for (i = 0; i < length; i++) 
     p[i] = s[length — i]; 
 printf("%s", p);

The output of the program is? (GATE CS 2004)

gnirts
gnirt
string
no output is printed

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Question 9

The Output of the following C code will be?

#include <stdio.h>
 
void my_toUpper(char* str, int index)
{
    *(str + index) &= ~32;
}
 
int main()
{
    char* arr = "geeksquiz";
    my_toUpper(arr, 0);
    my_toUpper(arr, 5);
    printf("%s", arr);
    return 0;
}

GeeksQuiz
geeksquiz
Compiler dependent
Runtime Error

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Question 10

Predict the output of the following program:

#include <stdio.h>
int main()
{
    char str[] = "%d %c", arr[] = "GeeksQuiz";
    printf(str, 0[arr], 2[arr + 3]);
    return 0;
}

G Q
71 81
71 Q
Compile-time error

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