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C Operators

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Question 1

 

#include <stdio.h>

int main()
{
    int i = 1, 2, 3;
    
    printf("%d", i);
    
    return 0;
}

1
3
Garbage value
Compile time error

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Question 2

#include <stdio.h>

int main()
{
    int i = (1, 2, 3);
    
    printf("%d", i);
    
    return 0;
}

1
3
Garbage value
Compile time error

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Question 3

 
#include <stdio.h>

int main()
{
    int i;
    
    i = 1, 2, 3;
    printf("%d", i);
    
    return 0;
}

1
3
Garbage value
Compile time error

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Question 4

What is the output of below program?

#include <stdio.h>
int foo(int* a, int* b)
{
    int sum = *a + *b;
    *b = *a;
    return *a = sum - *b;
}
int main()
{
    int i = 0, j = 1, k = 2, l;
    l = i++ || foo(&j, &k);
    printf("%d %d %d %d", i, j, k, l);
    return 0;
}

1 2 1 1
1 1 2 1
1 2 2 1
1 2 2 2

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Question 5

#include <stdio.h>
int main()
{
    int i = 5, j = 10, k = 15;
    printf("%d ", sizeof(k /= i + j));
    printf("%d", k);
    return 0;
}

Assume size of an integer as 4 bytes. What is the output of above program?

4 1
4 15
2 1
Compile-time error

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Question 6

#include <stdio.h>
int main()
{
    //Assume sizeof character is 1 byte and sizeof integer is 4 bytes
    printf("%d", sizeof(printf("GeeksQuiz")));
    return 0;
}

GeeksQuiz4
4GeeksQuiz
GeeksQuiz9
4
Compile-time error

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Question 7

Output of following program?

#include <stdio.h>
int f1() { printf ("Geeks"); return 1;}
int f2() { printf ("Quiz"); return 1;}

int main()
{
  int p = f1() + f2();
  return 0;
}

GeeksQuiz
QuizGeeks
Compiler Dependent
Compiler Error

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Question 8

What is the output of following program?

#include <stdio.h>

int main()
{
   int a = 1;
   int b = 1;
   int c = a || --b;
   int d = a-- && --b;
   printf("a = %d, b = %d, c = %d, d = %d", a, b, c, d);
   return 0;
}

a = 0, b = 1, c = 1, d = 0
a = 0, b = 0, c = 1, d = 0
a = 1, b = 1, c = 1, d = 1
a = 0, b = 0, c = 0, d = 0

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Question 9

#include <stdio.h> 
int main() 
{ 
  int a = 10, b = 20, c = 30; 
  if (c > b > a) 
    printf("TRUE"); 
  else
    printf("FALSE"); 
  return 0; 
}

TRUE
FALSE
Compiler Error
Output is compiler dependent

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Question 10

#include<stdio.h> 
int main() 
{ 
  char *s[] = { "knowledge","is","power"}; 
  char **p; 
  p = s; 
  printf("%s ", ++*p); 
  printf("%s ", *p++); 
  printf("%s ", ++*p); 
  
  return 0; 
}

is power
nowledge nowledge s
is ower
nowledge knowledge is

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