R E A R R A N G E

1 files changed, 57 insertions, 0 deletions

diff --git a/OLD/ee2301/baseConvert.cpp b/OLD/ee2301/baseConvert.cpp
new file mode 100644
index 0000000..d675741
--- /dev/null
+++ b/OLD/ee2301/baseConvert.cpp
@@ -0,0 +1,57 @@
+// C program to convert a number from any base
+// to decimal
+#include <stdio.h>
+#include <string.h>
+#include <iostream>
+
+// To return value of a char. For example, 2 is
+// returned for '2'. 10 is returned for 'A', 11
+// for 'B'
+int val(char c)
+{
+    if (c >= '0' && c <= '9')
+        return (int)c - '0';
+    else
+        return (int)c - 'A' + 10;
+}
+
+// Function to convert a number from given base 'b'
+// to decimal
+int toDeci(char *str, int base)
+{
+    int len = strlen(str);
+    int power = 1; // Initialize power of base
+    int num = 0;   // Initialize result
+    int i;
+
+    // Decimal equivalent is str[len-1]*1 +
+    // str[len-1]*base + str[len-1]*(base^2) + ...
+    for (i = len - 1; i >= 0; i--)
+    {
+        // A digit in input number must be
+        // less than number's base
+        if (val(str[i]) >= base)
+        {
+            printf("Invalid Number");
+            return -1;
+        }
+
+        num += val(str[i]) * power;
+        power = power * base;
+    }
+
+    return num;
+}
+
+// Driver code
+int main()
+{
+    char str[] = "11A";
+    int base = 16;
+    printf("Please enter number followed by base: ");
+    std::cin >> str >> base;
+    printf("Decimal equivalent of %s in base %d is"
+           " %d\n",
+           str, base, toDeci(str, base));
+    return 0;
+}