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Kategori : find last prime number in c++ prime number tricky question Tricky C++ questions
These tricky kinds of c++ programs can be given in quiz.
Tell a prime number which exist before an entered number
Where the entered number can be a prime number or not
For example:
Input: 11
Output: last prime number is 7
or
Input: 8
Output: Last prime number is 7
C++ CODE
#include<iostream>
using namespace std;
int main()
{
int num,count=0;
cout<<"Enter number to find last prime number occurs before it: ";
cin>>num;
for( int a=num-1;a>=1;a--)
{
for(int b=2;b<a;b++)
{
if(a%b==0)
count++;
}
if(count==0)
{
if(a==1)
{
cout<<"no prime number less than 2";
break;
}
cout<<a<<" is the last prime number before entered number";
break;
}
count=0;
}
return 0;
}
Sample output:
Image of Code:
Tell a prime number which exist before an entered number
Where the entered number can be a prime number or not
For example:
Input: 11
Output: last prime number is 7
or
Input: 8
Output: Last prime number is 7
C++ CODE
#include<iostream>
using namespace std;
int main()
{
int num,count=0;
cout<<"Enter number to find last prime number occurs before it: ";
cin>>num;
for( int a=num-1;a>=1;a--)
{
for(int b=2;b<a;b++)
{
if(a%b==0)
count++;
}
if(count==0)
{
if(a==1)
{
cout<<"no prime number less than 2";
break;
}
cout<<a<<" is the last prime number before entered number";
break;
}
count=0;
}
return 0;
}
Sample output:
Image of Code:
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