C Exercises: Reverse digits of a given a 32-bit signed integer
C Programming Practice: Exercise-5 with Solution
Write a C programming to reverse digits of a given a 32-bit signed integer.
C Code:
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
static int reverse(int x)
{
int y = 0;
while (x != 0) {
int n = x % 10;
if (y > INT_MAX / 10 || y < INT_MIN / 10) {
return 0;
}
y = y * 10 + n;
x /= 10;
}
return y;
}
int main(void)
{
int x = 123;
printf("Original integer: %12d",x);
printf("\nReverse integer : %12d",reverse(x));
return 0;
}
Sample Output:
Original integer: 123 Reverse integer : 321
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Previous: Write a C programming to find the longest palindromic substring of a given string.Maximum length of the given string is 1000.
Next: Write a C program to convert a given integer to roman number.
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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
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