C Language Practice Programs 1

Determine output:

#include <stdio.h>
void main()
{
char *p = NULL;
char *q = 0;
if(p)
printf(” p “);
else
printf(“nullp”);
if(q)
printf(“q”);
else
printf(” nullq”);
}

1. p q
2. Depends on the compiler
3. x nullq where x can be p or nullp depending on the value of NULL
4. nullp nullq

Ans: 4

 What is the output?

#include <stdio.h>
void main()
{
printf(“Hi Friends”+3);
}

Output: Friends

 The address operator &, cannot act on

1. Constants
2. Arithmetic expressions
3. Both of the above
4. Local variables

Ans: 3

What is the output?

#include <stdio.h>
void main()
{
int a[][3]={0,1,2,3,4,5};
printf(“%d”,sizeof(a));
}

Ans: 12 or 24

#include<stdio.h>

void main()
{
int *ptr, a=10;
ptr = &a;
*ptr += 1;
printf(“%d, %d”, *ptr, a);
}

1. 10, 10
2. 10, 11
3. 11, 10
4. 11, 11

Ans: 4

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What is the output?

#include <stdio.h>
void main()
{
void x(void);
x();
return 0;
}
void x(void)
{
char a[]=”HELLO”;
char *b = “HELLO”;
char c[10]=”HeLLO”;
printf(“%s %s %s\n”,a,b,c);
printf(“%d %d %d\n”,sizeof(a),sizeof(b),sizeof(c));
}

Output: 6  4  10

Determine Output:

void main()
{
char *str1 = “abcd”;
char str2[] = “abcd”;
printf(“%d %d %d”, sizeof(str1), sizeof(str2), sizeof(“abcd”));
}

1. 2 5 5
2. 2 4 4
3. 8 5 5
4. 2 4 5

Ans: 3

 what is the output?

#include <stdio.h>
void main()
{
register int x =5, *p;
p = &x;
printf(“%d”,*p);
}

Ans: Error

What will be printed after compiling and running the following code?

main()
{
char *p;
printf(“%d %d”,sizeof(*p), sizeof(p));
}

1. 1 1
2. 1 2
3. 2 1
4. 2 2

Ans: 2

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