Interview Questions

UST Global- Interview Experience

Interview Questions

UST Global- Interview Questions II



Program 16

Write a program for Addition using shift operator

	#include<stdio.h>
	main()
	{
		int a,b,c,res;
		printf("enter 2 number\n");
		scanf("%d%d",&a,&b);
		while(b!=0)
		{
			c=a&b;
			a=a^b;
			b=c<<1;
	//		printf("b = %d\n",b);
		}
	
		printf("addition = [%d]\n",a);
	}


Program 17

Write a c program for Addition using shift operator

	#include<stdio.h>
	main()
	{
		int a,b,r;
		printf("enter two number :\n");
		scanf("%d%d",&a,&b);
		r=printf("%*s%*s",a," ",b," ");
		printf("sum of [%d] and [%d] is : [%d]\n",a,b,r);
	}

/* here * is present in b/w % and s , the printf() will print the string "" after 10 space and "" after 20 spaces and then the printf() will return 30 as , it has printed 30 characters, so o/p will be 30 */


Program 18

Write a c program for comparison

	#include<stdio.h>
	main()
	{
		int a,b;
		printf("enter 2 numbers\n");
		scanf("%d%d",&a,&b);
		!(a^b) ? printf("same\n")  : printf("different\n");
	}
	

Program 19

Write a c program for deletion

	#include<stdio.h>
	main()
	{
		int num,pos,bit,i,j;
		printf("enter the number:\n");
		scanf("%d",&num);
		printf("enter the position:\n");
		scanf("%d",&pos);
		printf("how many bits u want to delete:\n");
		scanf("%d",&bit);
	
		printf("before deleting anything no is:\n");
		for(i=31;i>=0;i--)
		{
			printf("%d",num>>i&1);
			if(i%8==0)
				printf(" ");
		}
		//...logic
		for(i=pos,j=pos+bit;j<=31;i++,j++)
		{
			if((num>>i&1)!=(num>>j&1))
				num=num^(1<<i);
		}
		//....end of logic
	
		printf("after deleting bit from part. pos no is:\n");
		for(i=31;i>=0;i--)
		{
			printf("%d",num>>i&1);
			if(i%8==0)
				printf(" ");
		}
	}


Program 20

Write a c program for  Hexadecimal to Decimal


	#include<stdio.h>
	#include<string.h>
	main()
	{
		int i,n=0,k=1,j;
		char a[5],b[5],c;
		printf("Enter hex number\n");
		gets(a);
		j=strlen(a);
		for(i=0,j=j-1;j>i;i++,j--)
		{
			c=a[i];
			a[i]=a[j];
			a[j]=c;
		}
		for(i=0;a[i];i++)
		{
			if(a[i]>='0' && a[i]<='9')
				b[i]=a[i]-48;
			else if(a[i]>='a' && a[i]<='f')
				b[i]=a[i]-87;
			else if(a[i]>='A' && a[i]<='F')
				b[i]=a[i]-55;
			else
			{
				printf("Wrong input\n");
				return;
			}
		}
		j=strlen(a);
		b[i]='\0';
		for(i=0;i<j;i++)
	// HERE	DON'T USE b[i] COZ FOR 0 48-48=0='\0' SO IT WILL FAIL
		{
			if(i==0)
				n=n+b[i];
			else
				n=n+(b[i]*(k=k*16));
		}
		printf("Decimal is %d\n",n);
	
	}


Program 21
Write a method which finds the maximum of two numbers you should not use if-else or any other comparison operator
	
	#include<stdio.h>
	main()
	{
		int a,b,c,max,res;
		printf("enter two number:\n");
		scanf("%d%d",&a,&b);
		c=a-b;
		res=(c>>31)&0x1;
		max=a-res*c;
		printf("max=%d\n",max);
	}
	
	
Program 22

WAP for Multiplication
	
	#include<stdio.h>
	main()
	{
		int a,b,sum=0,i,j;
		printf("enter 1st and 2nd number\n");
		scanf("%d%d",&a,&b);
		for(i=31;i>=0;i--)	
		{
			if(b & 1<<i)
				sum=sum+(a<<i);
		}
		printf("mul = [%d]\n",sum);
	}
	
	
Program 23

WAP  Letter Exange
	
	#include<stdio.h>
	#include<ctype.h>
	static char a[100];
	static int i=2;
	void swap(int j,int k)
	{
		char temp;
		if(((a[j]>=65)&(a[j]<=90))|((a[j]>=97)&(a[j]<=122)))
		{
			if(((a[k]>=65)&(a[k]<=90))|((a[k]>=97)&(a[k]<=122)))
			{
				temp=a[j];
				a[j]=a[k];
				a[k]=temp;
	
			}}}
	main()
	{
		printf("enter string\n"); 
		gets(a);
		while(a[i])
		{
			swap(i,i+1);
			i=i+4;
		}
		printf("%s\n",a);
	}
	
	
Program 24

WAP  Square root
	
	#include<stdio.h>
	void sort(char *);
	main()
	{
		int n,sum=1,i,j,k;
		char a[10];
		printf("Enter a number to find square root\n");
		scanf("%d",&n);
		for(j=2,i=0;n!=1;j++)
		{
			if(n % j ==0)
			{
				a[i++]=j;
				n=n/j;
				j=1;
			}
		}
		for(j=0;j<i;j++)
			printf("%d ",a[j]);
		for(j=0,k=1;k<i;j+=2,k+=2)
			if(a[j]==a[k])
				sum=sum*a[j];
			else
			{
				printf("Sqrt is in decimal\n");
				return;
			}
		printf("\nSquare root is %d\n",sum);
	}
	void sort(char *p)
	{
		int i,j;
		char ch;
		for(i=0;p[i];i++)
			for(j=i+1;p[j];j++)
				if(p[i]>p[j])
				{
					ch=p[i];
					p[i]=p[j];
					p[j]=ch;
				}
	}


Program 25

WAP  Suqart short

	#include<stdio.h>
	main()
	{
		float m,n=0.001,i;
		printf("Enter number to find square root\n");
		scanf("%f",&m);
		for(i=0;;i=i+n)
		{
			if((i*i)>m)
			{
				printf("i=%f\n",i);
				i=i-(n/10);
				break;
			}
		}
		printf("Sqrt is %0.2f\n",i);
	}
	
	
Program 26

WAP  Subtraction
	
	#include<stdio.h>
	main()
	{
		int a,b,c,res;
		printf("enter 2 number\n");
		scanf("%d%d",&a,&b);
		while(b!=0)
		{
			c=(~a)&b;
			a=a^b;
			b=c<<1;
			printf("a = %d b = %d c= %d\n",a,b,c);
		}
	
		printf("subtraction = [%d]\n",a);
	}


Program 27

Write a program to print sum of 4, 100 digits decimal number.
	
	#include<stdio.h>
	main()
	{
	int a[100], b[100], c[100], d[100], r[101], cy=0;
	int i;
	for(i=0;i<100;i++)
	a[i]=b[i]=c[i]=d[i]=9;
	for(i=99;i>=0;i--)
	{
	r[i+1]=a[i]+b[i]+c[i]+d[i]+cy;
	cy=r[i+1]/10;
	r[i+1]=r[i+1]%10;
	}
	r[0]=cy;
	for(i=0;i<=99;i++)
	printf("%d",r[i]);
	}
	
	Output:
	
	399999999999999999999999999999999999999999999999999999
	9999999999999999999999999999999999999999999999

	
Program 28

Write a function to get the value between two given bit positions from an integer?

	#include<stdio.h>
	main()
	{
	int n1,n2,n,num=0,i,j;
	printf("Enter a number\n");
	scanf("%d",&n);
	printf("Enter bit positions\n");
	scanf("%d%d",&n1,&n2);
	for(i=n1+1;i<n2;i++)
	num=num|(1<<i); //counting ones
	j=num & n; // we will get o/p in middle
	j=j>>(n1+1); // shift previous j to correct position
	printf("The number between bit position [%d] & [%d] is [%d] \n",n1,n2,j);
	}


Program 29

Wap to find how many 1's having 0 on its right side and 1 on left side( i.e 110)  in given hexadecimal number ?
	
	#include<stdio.h>
	main()
	{
	int n,x=6, i,c=0;
	printf("Enter the hexadecimal number\n");
	scanf("%d",&n);
	for(i=0;i<=31;)
	{
	if(((n>>i)&x)==6)
	{
	c++;
	i=i+3;
	}
	else
	i++;
	}
	printf("110 is %d times\n",c);
	}

	
Program 30

Wap to convert given integer value into Boolean.

	#include<stdio.h>
	#define boo(x) (x==0 ? x : 1)
	main()
	{
	int i,n;
	printf("Enter a number\n");
	scanf("%d",&n);
	i=boo(n);
	printf("Bool for n is %d\n",i);
	}
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UST Global- Interview Questions II

UST Global- Interview Questions II

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