147 lines
2.9 KiB
C
147 lines
2.9 KiB
C
#include <stdio.h>
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#include <string.h>
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int scan(void);
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unsigned long func(int n);
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void output(unsigned long sum);
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void encr(unsigned long sum, char *cpum);
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int cpumodel(char cpum[]);
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int main() {
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int n;
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unsigned long isum;
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char cpum[64];
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cpumodel(cpum);
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printf("Buff: ");
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if (getchar() == '1') {
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setbuf(stdin, NULL);
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printf("buff is off\n");
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} else {
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printf("buff is on\n");
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}
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while(getchar()!='\n');
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n = scan();
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if(n == 0) return 0;
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isum = func(n);
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output(isum);
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encr(isum,cpum);
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return 0;
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}
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int scan(void){
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int x, n;
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n = 0;
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printf("Enter num: 1-100 000\nNum: ");
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while(((x = getchar())!='\n') && x != EOF){
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if((x >= '0') && (x <= '9')){
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n = (n*10) + (x-'0');
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}
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else{
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if(x == '\n');
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else(printf("Err \"%c\" is not a num.\n",x));
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while((x = getchar())!='\n')
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if(x == EOF) return 0;
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printf("Num: ");
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n = 0;
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continue;
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}
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if(n > 100000){
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while((x = getchar())!='\n')
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if(x == EOF) return 0;
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n = 0;
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printf("You enter n>100 000 Try again\nNum: ");
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continue;
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}
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if(x=='0'&&n<=0){
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while((x = getchar())!='\n')
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if(x == EOF) return 0;
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printf("You num cannot starts with 0. Try again\nNum: ");
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continue;
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}
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}
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if (x == EOF) return 0;
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return(n);
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}
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unsigned long func(int n){
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int i;
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unsigned long sum = 0;
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unsigned char mem[65536];
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char data[256 * 1024];
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for(i = 1; i <= n; i++){
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sum += i;
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mem[i%65536] = (unsigned char)(i % 256);
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data[i%(256*1024)] = (unsigned char)((sum + i) % 256U);
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}
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return sum;
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}
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void output(unsigned long sum){
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int i = 0;
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char buf[20];
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printf("\nresult: ");
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while(sum > 0){
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buf[i++] = (char)('0' + (sum % 10));
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sum /= 10;
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}
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while (i-- > 0)
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putchar(buf[i]);
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putchar('\n');
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}
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int cpumodel(char cpum[]) {
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int c, i = 0;
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printf("\nEnter proc name: ");
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while ((c = getchar()) != '\n' && c != EOF && i < 64 - 1) {
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cpum[i++] = (char)c;
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}
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cpum[i] = '\0';
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return i;
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}
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void encr(unsigned long sum, char *cpum) {
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char buf[20];
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int i = 0;
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int cpu_len = strlen(cpum);
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if (cpu_len == 0) {
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printf("CPU model is empty!\n");
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return;
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}
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if (sum == 0) {
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buf[i++] = '0';
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} else {
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while (sum > 0) {
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buf[i++] = '0' + (sum % 10);
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sum /= 10;
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}
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}
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printf("enc result: ");
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for (int j = i - 1; j >= 0; j--) {
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int digit = buf[j] - '0';
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char cpu_char = cpum[(i - 1 - j) % cpu_len];
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int enc = (digit + (int)cpu_char) % 10;
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putchar('0' + enc);
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}
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putchar('\n');
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}
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