C Practice Programs 1

What is the output?

#include <stdio.h>

int main()

{

int a[]={1,2,3,4,5,6,7};

char c[]={‘a’, ‘x’,’h’,’0′,’k’};

printf(“%d %d”,(&a[3]-&a[0]), (&c[3]-&c[0]));

return 0;

}

Ans: 3 3

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What will be the output?

#include <stdio.h>

int main()

{

int val = 5;

int* ptr = &val;

printf(“%d %d”, ++val, *ptr);

}

Ans: 6  5

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 what is the output?

#include <stdio.h>

void main()

{

char s1[]=”ravi”;

char s2[]=”rama”;

s1=s2;

printf(“%s”,s1);

}

Ans: Error

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What will be the output?

#include <stdio.h>

int main()

{

int val = 5;

int* ptr = &val;

printf(“%d %d”, val, *ptr++);

}

OP: 5 5

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What will be the output?

#include <stdio.h>

int main()

{

int val = 5;

int* ptr = &val;

printf(“%d %d”, val, ++*ptr);

}

OP: 6 6

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What will be the output?

void main()

{

char *p;

p = “Hello”;

printf(“%c”,*&*p);

}

1. Hello
2. H
3. Some address will be printed
4. None of these

Ans: 2

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With every use of a memory allocation function, what function should be used to release allocated memory which is no longer needed?

1. unalloc()
2. dealloc()
3. release()
4. free()

Ans: Option 4

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What value does testarray[2][1][0] in the sample code above contain?

int testarray[3][2][2] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};

Ans: 11

What is the output of the following program?

void main()

{

int *p;

int a=5;

*p++;

printf(“%d”,a);

return 0;

}

Ans: 5

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Referring to the sample bellow, what is MAX_NUM?

#define MAX_NUM 15

Ans: Macro

 

Q:11. What is the output of the following code?

char *array[4] = {“abcdefgh”}

printf(“%d”,&array[4]-(array));

Ans: 4

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What is the output of the following code.

#define sq(a) (a*a)

printf (“%d”,sq(3+2));

Ans: 11

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What is importance of free() function?

Ans: It deal locates dynamic memory allocation

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What is a macro?

Ans: Substitution text or replacement text defined by #define

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