Chapter3

DeitelC/Chapter3/Crypted.c

@@ -0,0 +1,54 @@
+#include <stdio.h>
+
+int main (void) {
+int i = 0, final = 0, mult = 1;
+puts("Enter 4 digit integer:");
+scanf("%d", &i);
+
+if (i / 1000 >= 10) {
+    puts("More than 4 digit");
+    return 1;
+}
+
+while (i > 0) {
+    int digit = (((i % 10) + 7) %10);
+    final = digit * mult + final;
+    mult *= 10;
+    i /= 10;
+}
+int t = 0000;
+t = (final / 100) % 10;
+t = (final / 1000)*10 + t;
+t = (final%10)*100 + t;
+t = ((final / 10)%10)*1000 + t;
+final = t;
+printf("Crypted int: %d\n", final);
+
+puts("Enter crypted integer: ");
+scanf("%d", &i);
+if (i / 1000 >= 10) {
+    puts("More than 4 digit");
+    return 1;
+}
+
+
+t = i;
+t = (final / 100) % 10;
+t = (final / 1000)*10 + t;
+t = (final%10)*100 + t;
+t = ((final / 10)%10)*1000 + t;
+i = t;
+//printf("Crypted int: %d\n", t);
+
+
+mult = 1, final = 0;
+
+while (i > 0) {
+    int digit = (((i % 10)+3) % 10);
+    final = digit * mult + final;
+    mult *= 10;
+    i /= 10;
+}
+printf("Encypted integer: %d\n", final);
+return 0;
+}