Conquer C

What will be the output of the program if value 126 given to scanf()?

#include<stdio.h>

int main()

{

int i;

printf("%d\n", scanf("%d", &i));

return 0;

}

• 126

• 2

• 1

• 5

What will be the output of the program ?

#include<stdio.h>

int main()

{

FILE *ptr;

char i;

ptr = fopen("myfile.c", "r");

while((i=fgetc(ptr))!=NULL)

printf("%c", i);

return 0;

}

• Print the contents of file "myfile.c"

• Print the contents of file "myfile.c" upto NULL character

• Infinite loop

• Error in program

What is the output of the program given below ?

#include<stdio.h>

int main()

{

enum status { pass, fail, atkt};

enum status stud1, stud2, stud3;

stud1 = pass;

stud2 = atkt;

stud3 = fail;

printf("%d, %d, %d\n", stud1, stud2, stud3);

return 0;

}

• 0, 1, 2

• 1, 2, 3

• 0, 2, 1

• 1, 3, 2

What is the output of the program

#include<stdio.h>

int main()

{

int x = 10, y = 20, z = 5, i;

i = x < y < z;

printf("%d\n", i);

return 0;

}

• 0

• 1

• Error

• None of these

What is the output of the program?

#include<stdio.h>

int main()

{

union a

{

int i;

char ch[2];

};

union a u;

u.ch[0] = 3;

u.ch[1] = 2;

printf("%d, %d, %d\n", u.ch[0], u.ch[1], u.i);

return 0;

}

• 3, 2, 515

• 515, 2, 3

• 3, 2, 5

• None of these

What will be the output of the program?

#include<stdio.h>

int main()

{

int i=4, j=-1, k=0, w, x, y, z;

w = i || j || k;

x = i && j && k;

y = i || j &&k;

z = i && j || k;

printf("%d, %d, %d, %d\n", w, x, y, z);

return 0;

}

• 1, 1, 1, 1

• 1, 1, 0, 1

• 1, 0, 0, 1

• 1, 0, 1, 1

What will be the output of the program?

#include<stdio.h>

int main()

{

char ch;

ch = 'A';

printf("The letter is");

printf("%c", ch >= 'A' && ch <= 'Z' ? ch + 'a' - 'A':ch);

printf("Now the letter is");

printf("%c\n", ch >= 'A' && ch <= 'Z' ? ch : ch + 'a' - 'A');

return 0;

}

• The letter is a

  Now the letter is A

• The letter is A

  Now the letter is a

• Error

• None of above

What will be the output of the program?

#include<stdio.h>

int main()

{

float a=0.7;

if(a < 0.7)

printf("C\n");

else

printf("C++\n");

return 0;

}

• C

• C++

• Compiler error

• None of above

Point out the error in the program

#include<stdio.h>

int f(int a)

{

a > 20? return(10): return(20);

}

int main()

{

int f(int);

int b;

b = f(20);

printf("%d\n", b);

return 0;

}

• Error: Prototype declaration

• No error

• Error: return statement cannot be used with conditional operators

• None of above

What will be the output of the program?

#include<stdio.h>

int sumdig(int);

int main()

{

int a, b;

a = sumdig(123);

b = sumdig(123);

printf("%d, %d\n", a, b);

return 0;

}

int sumdig(int n)

{

int s, d;

if(n!=0)

{

d = n%10;

n = n/10;

s = d+sumdig(n);

}

else

return 0;

return s;

}

• 4, 4

• 3, 3

• 6, 6

• 12, 12