Explore topic-wise MCQs in Engineering.

A function that receives variable number of arguments should use va_arg() to extract the last argument from the variable argument list.

What will be the output of the program ?

#include<stdio.h> int main()
{ int x=30, *y, *z; y=&x; /* Assume address of x is 500 and integer is 4 byte size */ z=y; *y++=*z++; x++; printf("x=%d, y=%d, z=%d n", x, y, z); return 0;
}

What will be the output of the program ?

#include<stdio.h> int main()
{ void *vp; char ch=74, *cp="JACK"; int j=65; vp=&ch; printf("%c", *(char*)vp); vp=&j; printf("%c", *(int*)vp); vp=cp; printf("%s", (char*)vp+2); return 0;
}

What will be the output of the program?

#include<stdio.h> int main() { int i=-3, j=2, k=0, m; m = ++i && ++j && ++k; printf("%d, %d, %d, %d n", i, j, k, m); return 0; } 

It is necessary that a header files should have a .h extension?

How many bytes are occupied by near, far and huge pointers (DOS)?

In a function two return statements should never occur.

Which of the statements is correct about the program?

#include<stdio.h> int main()
{ int arr[3][3] = {1, 2, 3, 4}; printf("%d n", *(*(*(arr)))); return 0;
}

Which of the following is the correct order of evaluation for the below expression?
z = x + y * z / 4 % 2 - 1

What will be the output of the program ?

#include<stdio.h> int main()
{ int i, a[] = {2, 4, 6, 8, 10}; change(a, 5); for(i=0; i<=4; i++) printf("%d, ", a[i]); return 0;
}
void change(int *b, int n)
{ int i; for(i=0; i<n; i++) *(b+1) = *(b+i)+5;
}

Will the printf() statement print the same values for any values of a?

#include<stdio.h>
int main()
{ float a; scanf("%f", &a); printf("%f n", a+a+a); printf("%f n", 3*a); return 0;
}

What will be the output of the program if the array begins 1200 in memory?

#include<stdio.h> int main() { int arr[]={2, 3, 4, 1, 6}; printf("%u, %u, %u n", arr, &arr[0], &arr); return 0; } 

Which of the following is correct way to define the function fun() in the below program?

#include<stdio.h> int main()
{ int a[3][4]; fun(a); return 0;
}

Point out the error, if any in the program.

#include<stdio.h> int main()
{ int a = 10, b; a >=5 ? b=100: b=200; printf("%d n", b); return 0;
}

Which of the following cannot be checked in a switch-case statement?

Which of the following statements are correct about the program?

#include<stdio.h>
int main()
{ int x = 30, y = 40; if(x == y) printf("x is equal to y n"); else if(x > y) printf("x is greater than y n"); else if(x < y) printf("x is less than y n") return 0;
}

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; } 

Are the following two statement same?

Macros have a local scope.

Which of the following correctly shows the hierarchy of arithmetic operations in C?

In which order do the following gets evaluated

Associativity has no role to play unless the precedence of operator is same.

A short integer is at least 16 bits wide and a long integer is at least 32 bits wide.

If the binary eauivalent of 5.375 in normalised form is 0100 0000 1010 1100 0000 0000 0000 0000, what will be the output of the program (on intel machine)?

#include<stdio.h>
#include<math.h>
int main()
{ float a=5.375; char *p; int i; p = (char*)&a; for(i=0; i<=3; i++) printf("%02x n", (unsigned char)p[i]); return 0;
}

A header file contains macros, structure declaration and function prototypes.

A float occupies 4 bytes. If the hexadecimal equivalent of these 4 bytes are A, B, C and D, then when this float is stored in memory in which of the following order do these bytes gets stored?

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; } 

In a macro call the control is passed to the macro.

What will be the output of the program ?

#include<stdio.h> int main()
{ char str = "IndiaBIX"; printf("%s n", str); return 0;
}

Which of the following function sets first n characters of a string to a given character?

What will be the output of the program ?

#include<stdio.h> int main()
{ char str1[] = "Hello"; char str2[10]; char *t, *s; s = str1; t = str2; while(*t=*s) *t++ = *s++; printf("%s n", str2); return 0;
}

If the size of pointer is 4 bytes then What will be the output of the program ?

#include<stdio.h> int main()
{ char *str[] = {"Frogs", "Do", "Not", "Die", "They", "Croak!"}; printf("%d, %d", sizeof(str), strlen(str[0])); return 0;
}

What will be the output of the program (myprog.c) given below if it is executed from the command line?
cmd> myprog friday tuesday sunday

/* myprog.c */
#include<stdio.h> int main(int argc, char *argv[])
{ printf("%c", *++argv[1]); return 0;
}

Usually recursion works slower than loops.

What will be the output of the program?

#include<stdio.h> int main()
{ const int x=5; const int *ptrx; ptrx = &x; *ptrx = 10; printf("%d n", x); return 0;
}

Point out the error in the program (in Turbo-C).

#include<stdio.h>
#define MAX 128 int main()
{ const int max=128; char array[max]; char string[MAX]; array[0] = string[0] = 'A'; printf("%c %c n", array[0], string[0]); return 0;
}

A function may have any number of return statements each returning different values.

Names of functions in two different files linked together must be unique

Input/output function prototypes and macros are defined in which header file?

What will be the output of the program ?

#include<stdio.h>
#include<string.h> int main()
{ char str[] = "India 0 BIX 0"; printf("%s n", str); return 0;
}

What will be the output of the program in Turbo C (under DOS)?

#include<stdio.h> int main()
{ struct emp { char *n; int age; }; struct emp e1 = {"Dravid", 23}; struct emp e2 = e1; strupr(e2.n); printf("%s n", e1.n); return 0;
}

Point out the error in the program?

#include<stdio.h>
#include<string.h>
void modify(struct emp*);
struct emp
{ char name[20]; int age;
};
int main()
{ struct emp e = {"Sanjay", 35}; modify(&e); printf("%s %d", e.name, e.age); return 0;
}
void modify(struct emp *p)
{ p ->age=p->age+2;
}

The '.' operator can be used access structure elements using a structure variable.

Can we specify a variable filed width in a scanf() format string?

In a function that receives variable number of arguments the fixed arguments passed to the function can be at the end of argument list.

What is the purpose of fflush() function.

Point out the error in the program

#include<stdio.h> int main() { int i; #if A printf("Enter any number:"); scanf("%d", &i); #elif B printf("The number is odd"); return 0; }

Does there exist any way to make the command-line arguments available to other functions without passing them as arguments to the function?

Which of the following statements correct about the below program?

#include<stdio.h> int main() { union a { int i; char ch[2]; }; union a u1 = {512}; union a u2 = {0, 2}; return 0; } 

Is there any difference int the following declarations?
int fun(int arr[]);
int fun(int arr[2]);