Assignment 2(Trace output) Sem-II

 

 

                                          Assignment 2 ( Trace Output)

 

1) What will be output of the following program?

 

#include<stdio.h>

 int main(){

int x;

x=10,20,30;

printf("%d",x);

return 0;

}

 

Explanation:

Precedence table:

 

Operator	Precedence	Associative
=	More than ,	Right to left
,	Least	Left to right

 

Since assignment operator (=) has more precedence than comma operator .So = operator will be evaluated first than comma operator. In the following expression

x = 10, 20, 30

First 10 will be assigned to x then comma operator will be evaluated.

 

 

2)

#include<stdio.h>

int main()

{

char arr[11]="The African Queen";

 printf("%s",arr);

return 0;

}

 

Explanation:

Size of any character array cannot be less than the number of characters in any string which it has assigned. Size of an array can be equal (excluding null character) or greater than but never less than.

 

 

3) #include<stdio.h>

int main()

{

int a=2,b=7,c=10;

c=a==b;

printf("%d",c);

 return 0;

}

 

 

Explanation:

== is relational operator which returns only two values.

0: If a == b is false

1: If a == b is true

 Since

a=2 b=7

So, a == b is false hence c=0

 

4) #include<stdio.h>

 int main()

{

int max-val=100;

int min-val=10;

int avg-val;

avg-val = max-val + min-val / 2;

 printf("%d",avg-val);

return 0;

}

Explanation:

Compilation error

We cannot use special character – in the variable name.

 

5) #include<stdio.h>

int main(){

char arr[20]="MysticRiver";

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

 return 0;

}

 

Output-20

 

6) #include <stdio.h>

int main() {

            char *s="hello";

            char *p=s;

    printf("%c\t%c",*(p+3),s[1]);

            return 0;

}

Output –l e

7) #include <stdio.h>

void main()

{

char nm[]={'A', 'N', 'S', 'I', 0, 'C', '\0'};

int x=0;

while(nm[x]!= '\0')

printf("%c",nm [x++]);

}

Output-ANSI

8) #include<stdio.h>

#include<string.h>

int main()

{

char str1[20]="Hello", str2[20]="World";

printf("%s\n",strcpy(str2,strcat(str1, str2)));

return 0;

}

Output-

HelloWorld

 

9) struct student

{

char *name;

};

struct student s[2]

void main()

{

s[0].name = "alan";

s[1]=s[0];

printf("%s%s",s[0].name,s[1].name);

s[1].name = "turing";

printf("%s%s",s[0].name,s[1].name);

}

 

Output-alanalanalanturing

 

10) #include<stdio.h>

struct student

{

};

 

void main()

{

struct student s[2];

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

}

 

Output-0

 

11) #include <stdio.h>

 

 int main ( )

 { 

static char name [] =“programming”; 

char *s ;

s =&name[6]-4;

while(*s) 

printf ("%c",*s++); 

}

 

Output-

ogramming

 

 

12) #include <stdio.h>

#define Test(x) (x * x)

 int main ( )

 { 

int a, b = 3; 

a=Test(b+3); 

printf (“%d - %d”, a, b);

 }

 

Output-

15 - 3

13) struct employee 

{

 char ename [20];

 int empno; 

} el,* ptr,e[20];

 int main ( ) 

{ 

printf("\n%d",sizeof(el)); 

printf("\n%d",sizeof(ptr));

 printf("\n%d”,sizeof(el)); 

}

 

Output-

24

8

24