C Programming Lab

What is the scope of an external variable?

• Whole source file in which it is defined

• From the point of declaration to the end of the file in which it is defined

• Any source file in a program

• From the point of declaration to the end of the file being compiled

What is the output of this C code?

#include <stdio.h>

void main()

{

int x = 97;

int y = sizeof(x++);

printf("x is %d", x);

}

• x is 97

• x is 98

• x is 99

• Run time error

What is the output of the below c code?

#include <stdio.h>

void main()

{

char *s = "hello";

char *p = s;

printf("%p\t%p", p, s);

}

• Different address is printed

• Same address is printed

• Run time error

• Nothing

What is the output of this C code?

#include <stdio.h>

struct student

{

char a[5];

};

void main()

{

struct student s[] = {"hi", "hey"};

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

}

• h

• i

• e

• y

What is the output of this C code?

#include <stdio.h>

#define foo(m, n) m * n = 10

int main()

{

printf("in main\n");

}

• In main

• Compilation error as lvalue is required for the expression m*n=10

• Preprocessor error as lvalue is required for the expression m*n=10

• None of the mentioned

What is the output of this C code?

void main ()

{

int a=2;

if(a==2)

{

a=~a+2<<1;

printf("%d",a);

}

else

{

a=~a;

}

}

• 6

• -2

• 0

• None of above

Predict the output of the following C snippets

int main()

{

int main = 56;

printf("%d", main);

return 0;

}

• Compiler Error

• Depends on the compiler

• 56

• none of above

What is the output of the below c code?

#include<stdio.h>

int main()

{

char ch;

if(ch = printf(""))

printf("It matters\n");

else

printf("It doesn't matters\n");

return 0;

}

• It matters

• It doesn’t matters

• Run time error

• Nothing

How many times is Hello world printed ?

int main()

{

fork();

fork();

printf("Hello world\n");

}

• 1

• 2

• 4

• 8

Property of external variable to be accessed by any source file is called by C90 standard as

• external linkage

• external scope

• global scope

• global linkage