C Quiz to Test Your Knowledge

 What will be the output of the following program?

int main()

{

int x = 0;

while (x <= 5)

{

printf(“%d”, x);

if (x > 4)

goto func1;

x++;

}  

getchar();

return 0;

}

void foo()

{

func1:

printf(“Tech”);

}

What is the output of the following program?

#include <stdio.h>

int main()

{

char string[] = “DoNotRush!”;

char *s1 = string, *s2 = string;     

int x;

for(x = 0; x < 2; x++)

{

printf(” %c “, *string);

++s1;     

}

for(x = 0; x < 3; x++)

{

printf(” %c “, *s2);

++s2;     

}

return 0;

}

Which string function should you use to split strings into a series of tokens in C?

 What is the output of the following program?

#include <stdio.h>

void func(char **ptr) { }

int main(int argc, char **argv)

{

   func(argv);

   getchar();

   return 0;

}

 What is the output of the following program?

#include <stdio.h>

int func(int i)

{

  if(i%2) return (i–);

  else return func(func(i+1));

}

int main()

{

    int i;

    i = func(102);

    printf(“%d”,i);

}

What is the output of the following program?

#include<stdio.h>

int main()

{

static int zero=3;

if(–zero){

main();

printf(“%d*0”,zero);

}  

}

  In C, when you declare two or more functions as the same name but different parameters then what is it called?

What is the output of the following program?

# include <stdio.h>

int main()

{

int a=0;

for(a=0; a<20; a++)

{

switch(a)

{

case 0:

a+=10;

case 1:

a+=21;

case 5:

a+=4;

default:              

a-=1;

break;

}

printf(“%d  “, a);

}

return 0;

}

 What will be the result of the below expression?

strcmp(‘Tech’,’TECH’);

 What is the output of the following program?

#include <stdio.h>

int main()

{

if (remove(“Testing.txt”) != 0)

perror(“An error”);

else

puts(“A Success!”);

return 0;

}

What is the output of the following program?

#include <stdio.h>

int main()

{

    int value = 21 << 1 << 21 >> 16 << 4;

    printf(“%d”, value);

    return 0;

}

What is the output of the following program?

#include <stdio.h>

int main(void)

{

int val;

int data = 12;

val = 42 || –data;

printf(“%d %d”, val, data);

return 0;

}

What is the output of the following program?

#include<stdio.h>

struct Tech

{

    int val;

    struct Tech next_one;

};

int main()

{

    struct Tech data;

    data.val = 25;

    data.next_one = data;

    printf(“%d”, data.next_one.val);

    return 0;

}

Which command will help you to interchange one text into another?

What is the use of the function srand()?

Instead of the printf(), which function do you use to print the output from the following?

 What is the output of the following program?

#include<stdio.h>

int main()

{

  int data = 0121;

  printf(“%d”, data);

  return 0;

}

What is the output of the following program?

#include <stdio.h>

#define SIZE 20

int main()

{

int area = SIZE*SIZE;

printf(“%d”, area);

return 0;

}

What is the output of the following program?

#include <stdio.h>

int main()

{

int data;

for (data = 1; data <= 6; data++) {

printf(“HI”);

if (data == 4)

continue;

}

return (0);

}

What is the use of a break statement in C?

What is the output of the following program?

#include <stdio.h>

int main()

{

int val = 20;

float val1;

printf(“%d “, sizeof(++val – val1));

printf(“%d “, ++val);

return 0;

}

What is the output of the below program?

#include <stdio.h>

int main()

{

static int x = 5;

int y = 10;

{

int x = 10;

x++;

y–;

}

printf(“%d %d”, x, y);

return 0;

}

What is the output of the following program?

#include<stdio.h>

int main(){

char ch = 0;

int x = 1;

printf(“%d”, sizeof(x) == sizeof(ch+x));

return 0;

}

What is the output of the following program?

#include <stdio.h>

int main()

{

  char a[] = “Quiz in C”;

  printf(“%s”, a+2);

  return 0;

}

 What is the number of tokens in the below statement?

printf(“a = %d, &a = %x, x=%d”, a,&a,x);

 What will be the output of the following program?

#include <stdio.h>

#include <stdlib.h>

int main()

{

  for (int j=5; j>0; j-=2 )

  {

    printf(“%d”, j+1);

  }

  return 0;

}

 What is the output of the following program?

#include<stdio.h>

int main()

{

for(int i=0;i<3;i++){

    printf(“#”);

    for(int j=1;j<1;j++){

        printf(“*”);

    }

}

   return 0;

}

 What is the output of the following program?

#include<stdio.h>

int main()

{

 struct {int data;} val = {data = 2};

 printf(“%d”,val.data);

 return 0;

}

 What does the below statement do?

scanf(“%2s”, str);

What is the output of the following program?

#include<stdio.h>

int main()

{

    char *str = “Just a Quiz”;

    int num = 5;

    printf(“%.*s”, num, str);

    return 0;

}

 What is the output of the following program?

#include<stdio.h>

struct st

{

    int x=1021;

};

int main()

{

    printf(“%d”, sizeof(struct st));

    return 0;

}

From below, which operator do you use to access the structure variables?

What is the output of the following program?

#include <stdio.h>

#if X == 2

    #define Y 4

#else

    #define Y -1

#endif

int main()

{

    printf(“%d”, Y);

    return 0;

}

Can you guess the output of the following?

# include <stdio.h>

# define gets  “Hi There”

int main()

{

   printf(gets);

   return 0;

}

 From below, which function is not safe to use if you want to read from the console?

 What is the output of the following code?

#include<stdio.h>

#define f(a,b) a##b

int main()

{

   int var1 = 25;

   printf(“%d”, f(var,1));

   return 0;

}

 What is the output of the following program?

#include <stdio.h>

int main()

{

    int i = 5;

    printf(“%d %d %d”, i/2, i–, ++i);

    return 0;

}

Which of the following statements is correct in C?

Which of the following statements is correct for the return type of function?

Which of the following methods do C support?

What is the output of the following program?

#include <stdio.h>

int main()

{

    int x = 58;

    int * ptr = &x;

    –(*ptr);

    ++(*ptr);

    printf(“%d”, x);

    return 0;

}

 Can you guess the output of the below program?

for(;;){

    printf(“Hello!”);

}

What is the right way to include your own header file in C?

What will be the output of the following program?

#include <stdio.h>

int func(int a, int b, int c)

{

return a + b – c;

}

void main()

{

int (*ptr)(int, int, int);

ptr = &func;

printf(“%d”,(*ptr)(4, 6, -5));

}

What is the output of the below program?

#include<stdio.h>

int main()

{

for(int i=0;i<1;i++){

    printf(“H”);

    for(int j=1;j<2;j++){

        printf(“i,”);

        for(int k=1;k<2;k++){

            printf(” How are you?”);

        }

    }

}

   return 0;

}

 What is the use of mem functions in C?

Under the header file math.h, if you declare a function named sqrt(-x) then what will it return?

 If you want to print the time in UTC format then which function should you use?

 What is the output of the following program?

#include<stdio.h>

#include<stdlib.h>

int main()

{

   int a=20, b=10;

   printf(“%d”, a+(~b)%3);

   return 0;

}

Which preprocessor directive should you use when you want to give additional info to the compiler?