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```#include <stdio.h>

/*
Qsn:
Take an integer from user
If the number has 1 digit --> return sqaure of the number
If the number has 2 digits --> return the difference between the sum of the digits and the original number
If the number has 3 digits --> return the reverse of the given number
If the number has 4 or more digits --> return the remainder of original number divided by the sum of the digits of the number
*/

int temp = n, temp1 = n, temp3 = n;
int sum = 0, sum1 = 0, sum3 = 0;
int count = 0, result1 = 0, result2 = 0, result3 = 0, result4 = 0;

while(temp>0) {
count++;
temp = temp/10;
}

switch (count)
{
case 1:
result1 = n*n;
// printf("Result1 = %d\n", result1);
return result1;

case 2:
temp = n;
sum = 0;
while(temp>0) {
sum = sum  + (temp%10);
temp = temp/10;
}
result2 = sum-n;
// printf("Result2 = %d\n", result2);
return result2;

case 3:
// printf("case 3 : Result \n");

while(temp1>0) {
int rem = temp1%10;
sum1 = (sum1*10) + rem;
temp1 =temp1/10;
}
// printf("Result3 = %d\n", sum1);
return sum1;

case 4:
temp3 = n;
sum3 = 0;
while(temp3>0) {
sum3 = sum3  + (temp3%10);
temp3 = temp3/10;
}
result4 = n%sum3;
// printf("Result4 = %d\n", n%sum3);
return result4;

default:
break;
}
}

int main() {
int n;
printf("Enter an integer : \n");
scanf("%d", &n);
if(n<0) {
printf("Enter a positive number\n");
}