C Language quiz questions

what is the output of the following program

int  change( int  x )  {
 x = 7; 
}
main(){ 
	int x = 5;
	change(x);
	printf(“%d”,x);	
}

1. 5

2. 7

3. unknown

To copy a string into another, given:

char s1[30] = "xyz", s2[20];

1. s2 = s1;

2. strcpy(s2,s1);

3. Both wrong

To copy a string into another, given:

char s1[30] = "xyz", s2[20];

1. s2 = s1;

2. strcpy(s2,s1);

3. Both wrong

for(j=63 , i < 95 , i +=3) x += sqrt(j);

1. is correct

2. has syntax error

3. causes run-time error

The computer performs computations internally using

1. Binary number system

2. Decimal number system

3. Hexadec. number system

What is the role of variables in programming languages:

1. Perform standard functions like printing to the screen

2. Data storage

3. Both correct

choose the proper function to compute the cubic value of any input integer n:

1. int cube(void) { return (n * n * n) ; }

2. int cube(int n) { return (n * n * n) ; }

3. void cube(int n) { return (n * n * n) ; }

what is the best choice to print the value of variable x where:

int x = 123;

1. printf("%d",x);

2. printf("%c",x);

3. printf("%f",x);

what is the best choice to store the natural number PI = 3.1459

1. int pi = 3.1459;

2. char pi = 3.1459;

3. float pi = 3.1459;

The value of z in the following statement:

int x = 9 , y = 2 , z = x / y;

1. 4

2. 4.5

3. 5

To get a statement from the user input in the array

char s[100] :

1. gets( s );

2. scanf( "%s", s );

3. Both correct

6. main() { extern int i; i=20; printf("%d",i); }

1.  

   LINKER ERROR

2. COMPILER ERROR

3. 20

4. ADDRESS

5. NONE

Main() { char s[ ]="man"; int i; for(i=0;s[ i ];i++) printf("\n%c%c%c%c",s[ i ],*(s+i),*(i+s),i[s]); }

1.  

   Mmm aaaa nnnnn

2. Mmmmm aaa nnnn

3.  

   Mmmm aaaa nnnn

4. Mmm aaa nnn

5. NONE

Void main() { int const * p=5; printf("%d",++(*p)); }

1.  

   COMPILER ERROR

2. 6

3. ADDRESS VALUE

4. 5

5. NONE

Will the program outputs "IndiaBIX.com"?

#include<stdio.h>
#include<string.h>
int main()
{
    char str1[] = "IndiaBIX.com";
    char str2[20];
    strncpy(str2, str1, 8);
    printf("%s", str2);
    return 0;
}

1. Yes

2. No

We can modify the pointers "source" as well as "target".

1. True

2. False

Point out the error in the following program.

#include<stdio.h>
void display(int (*ff)());
int main()
{
    int show();
    int (*f)();
    f = show;
    display(f);
    return 0;
}
void display(int (*ff)())
{
    (*ff)();
}
int show()
{
    printf("IndiaBIX");
}

1. Error: invalid parameter in function display()

2. Error: invalid function call f=show;

3. No error and prints "IndiaBIX"

4. No error and prints nothing.

What will be the output of the program?

#include<stdio.h>
int main()
{
    char huge *near *far *ptr1;
    char near *far *huge *ptr2;
    char far *huge *near *ptr3;
    printf("%d, %d, %d\n", sizeof(**ptr1), sizeof(ptr2), sizeof(*ptr3));
    return 0;
}

1. 4, 4, 4

2. 2, 2, 2

3. 2, 8, 4

4. 2, 4, 8

What do the following declaration signify?

void *cmp();

1. cmp is a pointer to an void type.

2. cmp is a void type pointer variable.

3. cmp is a function that return a void pointer.

4. cmp function returns nothing.

Point out the correct statement which correctly free the memory pointed to by 's' and 'p' in the following program?

#include<stdio.h>
#include<stdlib.h>
int main()
{
    struct ex
    {
        int i;
        float j;
        char *s
    };
    struct ex *p;
    p = (struct ex *)malloc(sizeof(struct ex));
    p->s = (char*)malloc(20);
    return 0;
}

1. free(p); , free(p->s);

2. free(p->s); , free(p);

3. free(p->s);

4. free(p);