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Home ‣ C Programming ‣ Strings See What Others Are Saying!
  • Question

  • What will be the output of the program? 
    #include<stdio.h>

int main()
{
    char str1[] = "Hello";
    char str2[] = "Hello";
    if(str1 == str2)
        printf("Equal\n");
    else
        printf("Unequal\n");
    return 0;
}


  • Options
  • A. Equal
  • B. Unequal
  • C. Error
  • D. None of above

  • Correct Answer
  • Unequal 

    Explanation
    Step 1: char str1[] = "Hello"; The variable str1 is declared as an array of characters and initialized with a string "Hello".

    Step 2: char str2[] = "Hello"; The variable str2 is declared as an array of characters and initialized with a string "Hello".

    We have use strcmp(s1,s2) function to compare strings.

    Step 3: if(str1 == str2) here the address of str1 and str2 are compared. The address of both variable is not same. Hence the if condition is failed.

    Step 4: At the else part it prints "Unequal".

    More questions

    • 1. On left shifting, the bits from the left are rotated and brought to the right and accommodated where there is empty space on the right?

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. What is (void*)0?

    • Options
    • A. Representation of NULL pointer
    • B. Representation of void pointer
    • C. Error
    • D. None of above
      • Discuss
    • 3. Bitwise & and | are unary operators

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. Point out the error in the program. 
      #include<stdio.h>
const char *fun();

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

    • Options
    • A. Error: Lvalue required
    • B. Error: cannot convert 'const char *' to 'char *'.
    • C. No error and No output
    • D. None of above
      • Discuss
    • 5. In a function that receives variable number of arguments the fixed arguments passed to the function can be at the end of argument list.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. Point out the error in the following program. 
      #include<stdio.h>
#include<stdarg.h>

int main()
{
    void display(char *s, int num1, int num2, ...);
    display("Hello", 4, 2, 12.5, 13.5, 14.5, 44.0);
    return 0;
}
void display(char *s, int num1, int num2, ...)
{
    double c;
    char s;
    va_list ptr;
    va_start(ptr, s);
    c = va_arg(ptr, double);
    printf("%f", c);
}

    • Options
    • A. Error: invalid arguments in function display()
    • B. Error: too many parameters
    • C. Error: in va_start(ptr, s);
    • D. No error
      • Discuss
    • 7. Point out the error if any in the following program (Turbo C). 
      #include<stdio.h>
#include<stdarg.h>
void display(int num, ...);

int main()
{
    display(4, 'A', 'a', 'b', 'c');
    return 0;
}
void display(int num, ...)
{
    char c; int j;
    va_list ptr;
    va_start(ptr, num);
    for(j=1; j<=num; j++)
    {
        c = va_arg(ptr, char);
        printf("%c", c);
    }
}

    • Options
    • A. Error: unknown variable ptr
    • B. Error: Lvalue required for parameter
    • C. No error and print A a b c
    • D. No error and print 4 A a b c
      • Discuss
    • 8. Point out the error in the following program. 
      #include<stdio.h>
#include<stdarg.h>
void varfun(int n, ...);

int main()
{
    varfun(3, 7, -11, 0);
    return 0;
}
void varfun(int n, ...)
{
    va_list ptr;
    int num;
    num = va_arg(ptr, int);
    printf("%d", num);
}

    • Options
    • A. Error: ptr has to be set at begining
    • B. Error: ptr must be type of va_list
    • C. Error: invalid access to list member
    • D. No error
      • Discuss
    • 9. Point out the error in the following program. 
      #include<stdio.h>
#include<stdarg.h>
void display(char *s, ...);
void show(char *t, ...);

int main()
{
    display("Hello", 4, 12, 13, 14, 44);
    return 0;
}
void display(char *s, ...)
{
    show(s, ...);
}
void show(char *t, ...)
{
    int a;
    va_list ptr;
    va_start(ptr, s);
    a = va_arg(ptr, int);
    printf("%f", a);
}

    • Options
    • A. Error: invalid function display() call
    • B. Error: invalid function show() call
    • C. No error
    • D. Error: Rvalue required for t
      • Discuss
    • 10. What will be the output of the program? 
      #include<stdio.h>
#include<math.h>

int main()
{
    float i = 2.5;
    printf("%f, %d", floor(i), ceil(i));
    return 0;
}

    • Options
    • A. 2, 3
    • B. 2.000000, 3
    • C. 2.000000, 0
    • D. 2, 0
      • Discuss

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