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

Last update on May 27 2022 12:24:51 (UTC/GMT +8 hours)

C For Loop: Exercise-38 with Solution

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

Pictorial Presentation:

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:

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

Static variable inside of a function in C

The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().

The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.

The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().

Ref : https://bit.ly/3fOq7XP