Long time no see

2026-02-21 10:47:00 +07:00
parent 0d54fe176e
commit b7df98a55c
198 changed files with 3249 additions and 1 deletions
@@ -0,0 +1,146 @@
+#include <stdio.h>
+#include <string.h>
+
+int scan(void);
+unsigned long func(int n);
+void output(unsigned long sum);
+void encr(unsigned long sum, char *cpum);
+int cpumodel(char cpum[]);
+
+
+int main() {
+    int n;
+    unsigned long isum;
+    char cpum[64];
+    
+    cpumodel(cpum);
+    
+    printf("Buff: ");
+    if (getchar() == '0') {
+        setbuf(stdin, NULL);
+        printf("buff is off\n");
+    } else {
+        printf("buff is on\n");
+    }
+    while(getchar()!='\n');
+    
+    n = scan();
+    if(n == 0) return 0;
+    isum = func(n);
+
+    output(isum);
+    encr(isum,cpum);
+    return 0;
+}
+
+int scan(void){
+    int x, n;
+    n = 0;
+
+    printf("Enter num: 1-100 000\nNum: ");
+
+    while(((x = getchar())!='\n') && x != EOF){
+        if((x >= '0') && (x <= '9')){
+            n = (n*10) + (x-'0');
+        }
+
+        else{
+            if(x == '\n');
+            else(printf("Err \"%c\" is not a num.\n",x));
+            while((x = getchar())!='\n')
+                if(x == EOF) return 0;
+            printf("Num: ");
+            n = 0;
+            continue;
+            }
+
+        if(n > 100000){
+            while((x = getchar())!='\n')
+                if(x == EOF) return 0;
+            n = 0;
+            printf("You enter n>100 000 Try again\nNum: ");
+            continue;
+        }
+        
+        if(x=='0'&&n<=0){
+            while((x = getchar())!='\n')
+                if(x == EOF) return 0;
+        printf("You num cannot starts with 0. Try again\nNum: ");
+        continue;
+        }
+
+    }
+    if (x == EOF) return 0;
+    return(n);
+}
+  
+
+unsigned long func(int n){
+    int i;
+    unsigned long sum = 0;
+    unsigned char mem[65536];
+    char data[256 * 1024];
+
+    for(i = 1; i <= n; i++){
+        sum += i;
+        mem[i%65536] = (unsigned char)(i % 256);
+        data[i%(256*1024)] = (unsigned char)((sum + i) % 256U);
+    }
+    return sum;
+}
+
+
+void output(unsigned long sum){
+    int i = 0;
+    char buf[20];
+
+    printf("\nresult: ");
+    while(sum > 0){
+        buf[i++] = (char)('0' + (sum % 10));
+        sum /= 10;
+    }
+    while (i-- > 0)
+        putchar(buf[i]);
+    putchar('\n');
+}
+
+
+int cpumodel(char cpum[]) {
+    int c, i = 0;
+    printf("\nEnter proc name: ");
+    while ((c = getchar()) != '\n' && c != EOF && i < 64 - 1) {
+        cpum[i++] = (char)c;
+    }
+    cpum[i] = '\0';
+    return i;
+}
+
+
+void encr(unsigned long sum, char *cpum) {
+    char buf[20];
+    int i = 0;
+    int cpu_len = strlen(cpum);
+    
+    if (cpu_len == 0) {
+        printf("CPU model is empty!\n");
+        return;
+    }
+
+    if (sum == 0) {
+        buf[i++] = '0';
+    } else {
+        while (sum > 0) {
+            buf[i++] = '0' + (sum % 10);
+            sum /= 10;
+        }
+    }
+    
+    printf("enc result: ");
+    for (int j = i - 1; j >= 0; j--) {
+        int digit = buf[j] - '0';
+        char cpu_char = cpum[(i - 1 - j) % cpu_len];
+        int enc = (digit + (int)cpu_char) % 10;
+        putchar('0' + enc);
+    }
+    putchar('\n');
+}