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C Exercises: Check whether a number is a palindrome or not

C For Loop: Exercise-38 with Solution

Write a program in C to check whether a number is a palindrome or not.

Pictorial Presentation:

Check whether a number is a palindrome or not

Sample Solution:

C Code:

#include <stdio.h>

void main(){
    int num,r,sum=0,t;

    printf("Input a number: ");
    scanf("%d",&num);

    for(t=num;num!=0;num=num/10){
         r=num % 10;
         sum=sum*10+r;
    }
    if(t==sum)
         printf("%d is a palindrome number.\n",t);
    else
         printf("%d is not a palindrome number.\n",t);

}

Sample Output:

Input a number: 121                                                                                           
121 is a palindrome number.

Flowchart:

Flowchart : Check whether a number is a palindrome or not.

C Programming Code Editor:

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Previous: Write a program in C to display the number in reverse order.
Next: Write a program in C to find the number and sum of all integer between 100 and 200 which are divisible by 9.

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C Programming: Tips of the Day

Clearing a char array c

It depends on how you want to view the array. If you are viewing the array as a series of chars, then the only way to clear out the data is to touch every entry. memset is probably the most effective way to achieve this.

On the other hand, if you are choosing to view this as a C/C++ null terminated string, setting the first byte to 0 will effectively clear the string.

Ref : https://bit.ly/3uM7JnL