Cpp Questions and Answers

Q1)

#include<iostream.h>

#include<math.h>

voidmain()

{int n,x;

int sum=1; int fact=1;

cout<<”enter the value of x such that 0<x<1”;

cin>>x;

cout<<”enter the number of terms”;

cin>>n;

cout<<”e^x = 1+x+x^2/2!+... x^n/n!”;

if(x<=0&&x>=1)

cout<<”value of x is not within limits”;

else

for(int i=1;i<=n;i++)

{

fact=fact*i;

sum= sum+ (pow(x,i)/fact);

}

cout<<”e^”<<x<<” = “<<sum;

}

Q2)

#include<iostream.h>

void main()

{

int i,j;

for(int i=1;i<=4;i++)

{ cout<<’\n’;

for(j=i;j<=4;j++)

cout<<j<<’\t’;

}

}

Q3)

#include<iostream.h>

int sum(int);

void main()

{

int s=0,n;

cout<<”Enter the value of n”;

cin>>n;

s= sum(n);

cout<<”sum =”<<s;

}

int sum(int n)

{

if(n==0)

return 1;

else

return (n+sum(n-1));

}

Q4)

#include<iostream.h>

#include<string.h>

void main()

{char str[20];

int i,len,flag=0;

clrscr();

cout<<”enter a string”;

cin>>str;

len=strlen(str);

for(i=0;j=len-1;i<len/2;i++;j--)

if(str[i]!=str[j])

{

flag=1;

break;

}

if(flag==0)

cout<<str<<”is a palindrome word”;

else

cout<<str<<”is not a palindrome word”;

}

Q6)

#include<iostream.h>

#include<string.h>

void main()

{

char s1[20],s2[20],s3[20];

cout<<”Enter the first string”;

gets(s1);

cout<<”enter second string”;

gets(s2);

cout<<”enter the third string”;

gets(s3);

strcat(s1,s2);

strcat(s1,s3);

cout<<”\n the concatenated string is “;

puts(s1);

}