In this tutorial, we will learn following two methods of reversing a number.
1) Using Recursion
2) Using While loop
Reverse a given number using Recursion:
In this program, we are calling a user defined function “reverse_function”, the function is calling itself recursively.
#include<stdio.h> int main(){ int num,reverse_number; //User would input the number printf("\nEnter any number:"); scanf("%d",&num); //Calling user defined function to perform reverse reverse_number=reverse_function(num); printf("\nAfter reverse the no is :%d",reverse_number); return 0; } int sum=0,rem; reverse_function(int num){ if(num){ rem=num%10; sum=sum*10+rem; reverse_function(num/10); } else return sum; return sum; }
Output:
Enter any number: 23456 After reverse the no is :65432
Reversing a number using While loop
In the above program we learnt how to reverse a number using recursive function. Here we would learn how to do it using while loop.
#include<stdio.h> int main() { int num,rem,reverse_num=0; //Input number printf("\nEnter any number:"); scanf("%d",&num); while(num>=1) { rem = num % 10; reverse_num = reverse_num * 10 + rem; num = num / 10; } printf("\nReverse of input number is: %d", reverse_num); return 0; }
Output:
Enter any number: 49212 Reverse of input number is: 21294
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