C programming MCQ

1.
Turbo C 3.0 is based on

(A)	DOS
(B)	UNIX
(C)	Windows
(D)	LINUX
(E)	None

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Explanation:
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2.
Turbo C 4.5 is based on

(A)	DOS
(B)	UNIX
(C)	Windows
(D)	LINUX
(E)	None

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Explanation:
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3.

Find the output of following c code?

#include<stdio.h>

int main(){

int a=4,b=5;

printit(a, b);

}

printit(int b, int a){

printf("%d %d", a, b);

{

int a=0;

int b=1;

printf("%d %d", a, b);

}

return 0;

} 

(A)	4 5 0 1
(B)	5 4 0 1
(C)	5 4 5 4
(D)	None of these
(E)	Compilation error

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Explanation:
**

4.

The contents of a file will be lost if it is opened in

(A)	a mode
(B)	a- mode
(C)	w+ mode
(D)	a+ mode
(E)	r mode

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Explanation:
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5.

Find the output of following c code.

#include<stdio.h>

int main(){

int i=1,j=2,k=3;

if(i==1)

if(j==2)

if(k==3){

printf("ok");

break;

}

else

printf("continue");

printf("bye");

return 0;

} 

(A)	ok
(B)	okbye
(C)	Misplaced break
(D)	None of these
(E)	It will print nothing

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Explanation:
**

6.

Find the output of following c code.

#include<stdio.h>

int main(){

printf("C\question\bank");

return 0;

}

(A)	Cquestionbank
(B)	cuestionank
(C)	cuestioank
(D)	cquestioank
(E)	None of these.

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Explanation:
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7.

What will be output if you will execute following c code?

#include<stdio.h>

int main(){

    char c=+'A';

    printf("%d",c);

return 0;

}

(A)	65
(B)	130
(C)	Garbage value
(D)	0
(E)	Compilation error

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Explanation:
**

8.

What will be output if you will execute following c code?

#include<stdio.h>

int main(){

    int num,a=5;

    num=+++a;

    printf("%d  %d",num,a);

return 0;

}

(A)	5 5
(B)	6 6
(C)	7 7
(D)	5 6
(E)	Compilation error

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Explanation:
**

9.

What will be output if you will execute following c code?

#include<stdio.h>

int main(){

    int num,a=10;

    num=a+++ +++a;

    printf("%d  %d",num,a);

return 0;

}

(A)	20 10
(B)	21 12
(C)	22 12
(D)	21 11
(E)	Compilation error

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Explanation:
**

10.

What will be output if you will execute following c code?

#include<stdio.h>

int main(){

    int z;

    z=5,3,2;

    printf("%d",z);

return 0;

}

(A)	5
(B)	3
(C)	2
(D)	10
(E)	Compilation error

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Explanation:
**

11.

What will be output if you will execute following c code?

#include<stdio.h>

int main(){

    int i=5,j=10,num;

    num=++i,++j,i+j;

    printf("%d  %d  %d",num,i,j);

return 0;

}

(A)	5 5 10
(B)	5 6 11
(C)	6 5 12
(D)	6 6 11
(E)	Compilation error

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Explanation:
**

12.

What will be output if you will execute following c code?

#include<stdio.h>

float avg(float,float,float);

int main(){

    float p=1,q=2,r=-2,a;

    a=avg(p,(q=4,r=-12,q),r);

    printf("%f",a);

return 0;

}

float avg(float x,float y,float z){

    return (x+y+z)/3;

}

(A)	1.000000
(B)	0.000000
(C)	0.333333
(D)	1.333333
(E)	Compilation error

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Explanation:
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13.

What will be output if you will execute following c code?

int main(){

    char c='\x15';

    char *ptr=&c;

    printf("%x",*ptr);   

return 0;

}

(A)	0x15
(B)	0X15
(C)	21
(D)	0x21
(E)	Compilation error

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Explanation:
**

14.

What will be output if you will execute following c code?

#include<stdio.h>

int main(){

    char array[]="Ashfaq \0 Kayani";

    char *str="Ashfaq \0 Kayani";

    printf("%s %c\n",array,array[2]);

    printf("%s %c\n",str,str[2]);

    printf("%d %d\n",sizeof(array),sizeof(str));

return 0;

}

(A)	Ashfaq h Ashfaq h 16 2
(B)	Ashfaq h Ashfaq Kayani h 2 16
(C)	Ashfaq Kayani h Ashfaq h 16 2
(D)	Ashfaq h Ashfaq h 2 16
(E)	Compilation error

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Explanation:
**

15.

What will be output if you will execute following c code?

#include<stdio.h>

union myStruct{

    int a;

    char b;

};

int main(){

    union myStruct ms={400};

    printf("%d  %d",ms.a,ms.b);

    return 0;

}

(A)	400 0
(B)	0 400
(C)	80 -112
(D)	400 -112
(E)	Compilation error

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Explanation:
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16.

#include<stdio.h>

union cqbu{

    int a;

    char b;

};

struct cqbs{

    int a;

    char b;

};

int main(){

    struct cqbs s={25,50};

    struct cqbs *ps=(struct cqbs *)&s;

    union  cqbu *pu=(union  cqbu *)&s;

    printf("%d  %d\n",ps->a,ps->b);

    printf("%d  %d\n",pu->a,pu->b);

    return 0;

}

(A)	25 50 25 25
(B)	25 50 50 50
(C)	25 25 25 50
(D)	50 50 50 25
(E)	Compilation error

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Explanation:
**

17.

int main(){

    float x;

    x=(int(float(double)5.5));

    printf("%f",x);

    return 0;

}

(A)	5.5
(B)	5.500000
(C)	5.000000
(D)	6.000000
(E)	Compilation error

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Explanation:

18.

What will be output if you will execute following c code?

int main(){

    float x;

    (int)x=5.8f;

    printf("%f",x);

    return 0;

}

(A)	5.800000
(B)	6.000000
(C)	7.000000
(D)	5.8
(E)	Compilation error

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Explanation:
**

19.

What will be output if you will execute following c code?

#include<stdio.h>

int main(){

    int a=5,b=10,c=15;

    int *arr[3]={&a,&b,&c};

    printf("%d",*arr[*arr[1]-8]);

return 0;

}

(A)	5
(B)	10
(C)	18
(D)	Garbage value
(E)	Compilation error

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Explanation:
**

20.

What will be output if you will execute following c code?

#include<stdio.h>

int main(){

    int arr[][3]={{1,2},{3,4,5},{5}};

    printf("%d %d %d",sizeof(arr),arr[0][2],arr[1][2]);

return 0;

}

(A)	6  0 4
(B)	6  1 5
(C)	18 0 5
(D)	18 1 5
(E)	Compilation error

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Explanation:
**