What are the C Programs asked in interviews? | Top programs in C, Mostly ask in interview, most helping for improve logic.


Important program of C Language that are asking in Interview

//Palindrome Number Program in C

#include<stdio.h>

int main()
{
    int n, r, sum=0, temp;
    printf("Enter the number=");
    scanf("%d", &n);
    temp=n;
    while(n>0)
    {
        r = n%10;
        sum = (sum*10)+r;
        n = n/10;
    }
    n=temp;
    if(n==sum)
    {
        printf("Palindrome Number");
    }
    else
    {
        printf("Not a Palindrome Number");
    }
}

Output:

Enter the number=4554 Palindrome Number


//Prime Number Program in C

#include<stdio.h>

int main()
{
    int n, i, count=0;
    printf("Enter the number=");
    scanf("%d", &n);
    for(i=1; i<=n; i++)
    {
    if(n%i==0)
    {
        count++;
    }
    }
    if(count==2)
    {
        printf("Prime Number");
    }
    else
    {
        printf("Not a Prime Number");
    }
}

Output:
Enter the number=7 Prime Number


//Fabonacci Series Program in C

#include<stdio.h>

int main()
{
    int n, a=0, b=1, c, i;
    printf("Enter the number=");
    scanf("%d", &n);
    for(i=1; i<=n; i++)
    {
        printf("%d\n", a);
        c=a+b;
        a=b;
        b=c;
    }
}

Output:
Enter the number=10 0 1 1 2 3 5 8 13 21 34

//Armstrong Number Program in C

#include<stdio.h>

int main()
{
    int n, r, c, sum=0, temp;
    printf("Enter the number=");
    scanf("%d", &n);
    temp=n;
    while(n>0)
    {
        r=n%10;
        c=r*r*r;
        sum=sum+c;
        n=n/10;
    }
    n=temp;
    if(n==sum)
    {
        printf("Armstrong Number");
    }
    else
    {
        printf("Not a Armstrong Number");
    }
}

Output:
Enter the number=153 Armstrong Number


//Reverse Number Program in C

#include<stdio.h>

int main()
{
    int i, reverse=0, remainder;
    printf("Enter numbers");
    scanf("%d", &i);
    while(i>0)
    {
        remainder = i%10;
        reverse = (reverse*10) + remainder;
        i = i/10;
    }
    printf("Reverse number =%d", reverse);
   
}

Output:
Enter numbers
123456789
Reverse number =987654321

//Factorial program in C language

#include<stdio.h>

int main()
{
    int n, i, fact=1;
    printf("Enter the number = ");
    scanf("%d", &n);
    for(i=1; i<=n; i++)
    {
        fact = fact*i;
    }
    printf("The factorial of %d is %d", n, fact);
    return 0;
}

Output:

Enter the number = 5 The factorial of 5 is 120

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