# 11112bignumber

Oct 1st, 2020
732
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1. #include <stdio.h>
2. /* 2016/09/22 */
3. int first4(int x){
4.     return x/10000;
5. }
6. int last4(int x){
7.     /* The operator % in C computes the remainder after division.
8.     For example, the answer of 23%7 will be 2.*/
9.     return x%10000;
10. }
11. int first8(int x){
12.     return x/100000000;
13. }
14. int last8(int x){
15.     return x%100000000;
16. }
17. int shift4(int x){
18.     return x*10000;
19. }
20. int main(void){
21.     int x;
22.     int a, b;
23.     int c1, c2, c3;
24.     /* Assume that the input is always an 8-digit positive integer. */
25.     scanf("%d", &x);
26.     a = first4(x);
27.     b = last4(x);
28.     c3 = last4(b*b);
29.     c2 = last8(2*a*b + first4(b*b) + shift4(last4(a*a)));
30.     c1 = first4(a*a)+first8(2*a*b + first4(b*b) + shift4(last4(a*a)));
31.     printf("%4d%08d%04d", c1, c2, c3);
32.     /* %04d will display a 4-digit number and add 0 as padding before the number if necessary */
33.     return 0;
34. }
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